The extent of power attainable by this machine, consistently with its application to practical uses, is not yet precisely defined. Within the limit thus far given to it, its power is certain, uniform, and entirely sufficient. It is not attended with the numerous perils that make the steam-engine so uncomfortable a servant, but is absolutely free from danger. It requires no engineering supervision. It consumes a very small amount of fuel (about one-third of the amount required by the steam-engine) and requires no water. These peculiarities not only make it a very desirable substitute for the steam-engine, but render it available for many purposes to which the steam-engine would never be applied.
In addition to his regular professional avocations, Ericsson was industriously occupied in devising new applications of the Calorie-Engine, when the attempted secession of the Southern States plunged the country into the existing war and struck a blow at all the arts of peace. Ills whole heart and mind were given at once to the support of the Union. Liberal in all his ideas, he is warmly attached to republican institutions, and has a hearty abhorrence of intolerance and oppression in all their forms. His early military education and his long study of the appliances of naval warfare increased the interest with which he watched the progress of events. The abandonment of the Norfolk navy-yard to the Rebels struck him as a disgrace that might have been avoided. He foresaw the danger of a formidable antagonist from that quarter in the steamship which we had so obligingly furnished them. The building of gun-boats with steam-machineryabovethe water-line—where the first shot from an enemy might render it useless—seemed to him, in view of what he had done and was ready to do again, a very unnecessary error. Knowing thoroughly all the improvements made and making in the war-steamers of England and France, and feeling the liability of their interference in our affairs, he could not appreciate the wisdom of building new vessels according to old ideas. The blockade of the Potomac by Rebel batteries, in the very face of our navy, seemed to him an indignity which need not be endured, if the inventive genius of the North could have fair play.
An impregnable iron gun-boat was, in his judgment, the thing that was needed; and he determined that the plan of such a vessel should be his contribution towards the success of the war. The subject was not a new one to him. He had given it much consideration, and his plan, in all its essential features, had been matured long before. Proposals for iron-clad vessels having been invited by the Navy Department, Ericsson promptly submitted his plans and specifications. Knowing the opposition that novelties always encounter, he had no great expectation that his proposal would be accepted. "I have done my part," said he; "I have offered my plan. It is for the Government to say whether I shall be allowed to carry it out." He felt confident, however, that, if the plan should be brought to the notice of the President, his practical wisdom and sound common sense could not fail to decide in its favor. Fortunately for the country, Ericsson's offer was accepted by the Navy Department. He immediately devoted all his energies to the execution of his task, and the result was the construction of the vessel to which he himself gave the name of the "Monitor." What she is and what she has accomplished, we need not here repeat. Whatever may be her future history, we may safely say, in the words of the New York Chamber of Commerce, that "the floating-battery Monitor deserves to be, and will be, forever remembered with gratitude and admiration."
We rejoice to believe that the merits and services of Ericsson are now fully appreciated by the people of the United States. The thanks of the nation have been tendered to him by a resolution of Congress. The Boston Board of Trade and the New York Chamber of Commerce have passed resolutions expressive of their gratitude. The latter body expressed also their desire that the Government of the United States should make to Captain Ericsson "such suitable return for his services as will evince the gratitude of a great nation." Upon hearing this suggestion, Ericsson, with characteristic modesty, remarked,—"All the remuneration I desire for the Monitor I get out of the construction of it. It is all-sufficient." Nevertheless we think the suggestion well worthy of consideration. In the same spirit of manly independence, he discountenanced the movement set on foot among the merchants of New York for the subscription of a sum of money to be presented to him. He asks nothing but fair remuneration for services rendered,—and that, it is to be hoped, the people will take care that he shall receive.
Ericsson is now zealously at work in constructing six new iron gun-boats on the plan of the Monitor. If that remarkable structure can be surpassed, he is the man to accomplish it. His ambition is to render the United States impregnable against the navies of the world. "Give me only the requisite means," he writes, "and in a very short time we can say to those powers now bent on destroying republican institutions, 'Leave the Gulf with your frail craft, or perish!' I have all my life asserted that mechanical science will put an end to the power of England over the seas. The ocean is Nature's highway between the nations. It should be free; and surely Nature's laws, when properly applied, will make it so."
His reputation as an engineer is worldwide. In 1852 he was made a Knight of the Order of Vasa by King Oscar of Sweden. The following extract from a poem "To John Ericsson" we translate from "Svenska Tidningen," the Government journal of Stockholm. It is eloquently expressive of the pride and admiration with which he is regarded in his native country.
"World-wide his fame, so gracefully adorningHis native Sweden with enduring radiance!Not a king's crown could give renown so noble:For his is Thought's great triumph, and the sceptreHe wields is over elements his subjects!"
Although now in his sixtieth year, Ericsson has the appearance of a man of forty. He is in the very maturity of a vigorous manhood, and retains all the fire and enthusiasm of youth. He has a frame of iron, cast in a large and symmetrical mould. His head and face are indicative of intellectual power and a strong will. His presence impresses one, at the first glance, as that of an extraordinary man. His bearing is dignified and courteous, with a touch perhaps of militarybrusqueriein his mode of address. He has a keen sense of humor, a kindly and generous disposition, and a genial and companionable nature. He is a "good hater" and a firm friend. Like all men of strong character and outspoken opinions, he has some enemies; but his chosen friends he "grapples to his heart with hooks of steel."
He is not a mere mechanician, but has great knowledge of men and of affairs, and an ample fund of information on all subjects. His conversation is engaging and instructive; and when he seeks to enlist coöperation in his mechanical enterprises, few men can withstand the force of his arguments and the power of his personal magnetism.
Although his earnings have sometimes been large, his heavy expenditures in costly experiments have prevented him from acquiring wealth. Money is with him simply a means of working out new ideas for the benefit of mankind; and in this way he does not scruple to spend to the utmost limit of his resources. He lives freely and generously, but is strictly temperate and systematic in all his habits.
The amount of labor which he is capable of undergoing is astonishing. While engaged in carrying out his inventions, it is a common thing for him to pass sixteen hours a day at his table, in the execution of detailed mechanical drawings, which he throws off with a facility and in a style that have probably never been surpassed. He does not seem to need such recreation as other men pine after. He never cares to run down to the seashore, or take a drive into the country, or spend a week at Saratoga or at Newport. Give him his drawing-table, his plans, his models, the noise of machinery, the clatter of the foundry, and he is always contented. Week in and week out, summer and winter, he works on and on,—and the harder he works, the more satisfied he seems to be. He is as untiring as one of his own engines, which never stop so long as the fire burns. Endowed with such a constitution, it is to be hoped that new triumphs and many years of honor and usefulness are yet before him.
* * * * *
Man is like an onion. He exists in concentric layers. He is born a bulb and grows by external accretions. The number and character of his involutions certify to his culture and courtesy. Those of the boor are few and coarse. Those of the gentleman are numerous and fine. But strip off the scales from all and you come to the same germ. The core of humanity is barbarism. Every man is a latent savage.
You may be startled and shocked, but I am stating fact, not theory. I announce not an invention, but a discovery. You look around you, and because you do not see tomahawks and tattooing you doubt my assertion. But your observation is superficial. You have not penetrated into the secret place where souls abide. You are staring only at the outside layer of your neighbors; just peel them and see what you will find.
I speak from the highest possible authority,—my own. Representing the gentler half of humanity, of respectable birth, tolerable parts, and good education, as tender-hearted as most women, not unfamiliar with the best society, mingling, to some extent, with those who understand and practise the minor moralities, you would at once infer from my circumstances that I was a very fair specimen of the better class of Americans,—and so I am. For one that stands higher than I in the moral, social, and intellectual scale, you will undoubtedly find ten that stand lower. Yet through all these layers gleam the fiery eyes of my savage. I thought I was a Christian, I have endeavored to do my duty to my day and generation; but of a sudden Christianity and civilization leave me in the lurch, and the "old Adam" within me turns out to be just such a fierce Saxon pirate as hurtled down against the white shores of Britain fifteen hundred years ago.
For we have been moving.
People who live in cities and move regularly every year from one good, finished, right-side-up house to another will think I give a very small reason for a very broad fact; but they do not know what they are talking about. They have fallen into a way of looking upon a house only as an exaggerated trunk, into which they pack themselves annually with as much nonchalance as if it were only their preparation for a summer trip to the seashore. They don't strike root anywhere. They don't have to tear up anything. A man comes with cart and horses. There is a stir in the one house,—they are gone;—there is a stir in the other house,—they are settled,—and everything is wound up and set going to run another year. We do these things differently in the country. We don't build a house by way of experiment and live in it a few years, then tear it down and build another. We live in a house till it cracks, and then we plaster it over; then it totters, and we prop it up; then it rocks, and we rope it down; then it sprawls, and we clamp it; then it crumbles, and we have a new underpinning,—but keep living in it all the time. To know what moving really means, you must move from just such a rickety-rackety old farmhouse, where you have clung and grown like a fungus ever since there was anything to grow,—where your life and luggage have crept into all the crevices and corners, and every wall is festooned with associations thicker than the cobwebs, though the cobwebs are pretty thick,—where the furniture and the pictures and the knick-knacks are so become a part and parcel of the house, so grown with it and into it, that you do not know they are chiefly rubbish till you begin to move them and they fall to pieces, and don't know it then, but persist in packing them up and carrying them away for the sake of auld lang syne, till, set up again in your new abode, you suddenly find that their sacredness is gone, their dignity has degraded into dinginess, and the faded, patched chintz sofa, that was not only comfortable, but respectable, in the old wainscoted sitting-room, has suddenly turned into "an object," when lang syne goes by the board and the heirloom is incontinently set adrift. Undertake to move from this tumble-down old house, strewn thick with thedébrisof many generations, into a tumble-up, peaky, perky, plastery, shingly, stary new one, that is not half finished, and never will be, and good enough for it, and you will perhaps comprehend how it is that I find a great crack in my life. On the farther side are prosperity, science, literature, philosophy, religion, society, all the refinements, and amenities, and benevolences, and purities of life,—in short, all the arts of peace, and civilization, and Christianity,—and on this side—moving. You will also understand why that one word comprises, to my thinking, all the discomforts short of absolute physical torture that can be condensed into the human lot. Condensed, did I say? If it were a condensed agony, I could endure it. One great, stunning, overpowering blow is undoubtedly terrible, but you rally all your fortitude to meet and resist it, and when it is over it is over and the recuperative forces go to work; but a trouble that worries and baffles and pricks and rasps you, that penetrates into all the ramifications of your life, that fills you with profound disgust, and fires you with irrepressible fury, and makes of you an Ishmaelite indeed, with your hand against every man and every man's hand against you,—ah! that is theexperimentum crucis. Such is moving, in the country,—not an act, but a process,—not a volition, but a fermentation.
We will say that the first of September is the time appointed for the transit. The day approaches. It is the twenty-ninth of August. I prepare to take hold of the matter in earnest. I am nipped in the bud by learning that the woman who was to help about the carpets cannot come, because her baby is taken with the croup. I have not a doubt of it. I never knew a baby yet that did not go and have the croup, or the colic, or the cholera infantum, just when it was imperatively necessary that it should not have them. But there is no help for it. I shudder and bravely gird myself for the work. I tug at the heavy, bulky, unwieldy carpets, and am covered with dust and abomination. I think carpets are the most untidy, unwholesome nuisances in the whole world. It is impossible to be clean with them under your feet. You may sweep your carpet twenty times and raise a dust on the twenty-first. I am sure I heard long ago of some new fashion that was to be introduced,—some Italian style, tiles, or mosaic-work, or something of the sort. I should welcome anything that would dispense with these vile rags. I sigh over the good old sanded floors that our grandmothers rejoiced in,—and so, apotheosizing the past and anathematizing the present, I pull away, and the tacks tear my fingers, and the hammer slips and lets me back with a jerk, and the dust fills my hair and nose and eyes and mouth and lungs, and my hands grow red and coarse and ragged and sore and begrimed, and I pull and choke and cough and strangle and pull.
So the carpets all come up and the curtains all come down. The bureaus march out of the chamber-windows and dance on a tight-rope down into the yard below. The chairs are set at "heads and points." The clothes are packed into the trunks. The flour and meal and sugar, all the wholesale edibles, are carted down to the new house and stored. The forks are wrapped up and we eat with our fingers, and have nothing to eat at that. Then we are informed that the new house will not be ready short of two weeks at least. Unavoidable delays. The plasterers were hindered; the painters misunderstood orders; the paperers have defalcated, and the universe generally comes to a pause. It is no matter in what faith I was nurtured, I am now a believer in total depravity. Contractors have no conscience; masons are not men of their word; carpenters are tricky; all manner of cunning workmen are bruised reeds. But there is nothing to do but submit and make the best of it,—a horrible kind of mechanism. We go forthwith into a chrysalis state for two weeks. The only sign of life is an occasional lurch towards the new house, just sufficient to keep up the circulation. One day I dreamily carry down a basket of wine-glasses. At another time I listlessly stuff all my slippers into a huge pitcher and take up the line of march. Again a bucket is filled with tea-cups, or I shoulder the fire-shovel. The two weeks drag themselves away, and the cry is still, "Unfinished!" To prevent petrifying into a fossil remain, or relapsing into primitive barbarism, or degenerating into a dormouse, I rouse my energies and determine to put my own shoulder to the wheel and see if something cannot be accomplished. I rise early in the morning and walk to Dan, to hire a painter who is possessed of "gumption," "faculty." Arrived in Dan, I am told that he is in Beersheba. Nothing daunted, I take a short cut across the fields to Beersheba, bearding manifold dangers from rickety stone-walls, strong enough to keep women in, but not strong enough to keep bears, bulls, and other wild beasts out,—toppling enough to play the mischief with draperies, but not toppling enough to topple over when urgently pressed to do so. But I secure my man, and remember no more my sorrow of bulls and stones for joy at my success. From Beersheba I proceed to Padan-aram to buy seven pounds of flour, thence to Galilee of the Gentiles for a pound of cheese, thence to the land of Uz for a smoked halibut, thence to the ends of the earth for a lemon to make life tolerable,—and the days hobble on.
"The flying gold of the ruined woodlands" drives through the air, the signal is given, and there is no longer "quiet on the Potomac." The unnatural calm gives way to an unearthly din. Once more I bring myself to bear on the furniture and the trumpery, and there is a small household whirlpool. All that went before "pales its ineffectual fires." Now comes the strain upon my temper, and my temper bends, and quivers, and creaks, and cracks. Ithuriel touches me with his spear; all the integuments of my conventional, artificial, and acquired gentleness peel off, and I stand revealed a savage. Everything around me sloughs off its usual habitude and becomes savage. Looking-glasses are shivered by the dozen. A bit is nicked out of the best China sugar-bowl. A pin gets under the matting that is wrapped around the centre-table and jags horrible hieroglyphics over the whole polished surface. The bookcase that we are trying to move tilts, and trembles, and goes over, and the old house through all her frame gives signs of woe. A crash detonate on the stairs brings me up from the depths of the closet where I am burrowing. I remember seeing Petronius disappear a moment ago with my lovely and beloved marble Hebe in his arms. I rush rampant to the upper landing in time to see him couchant on the lower. "I have broken my leg," roars Petronius, as if I cared for his leg. A fractured leg is easily mended; but who shall restore me the nose of my nymph, marred into irremediable deformity and dishonor?
Occasionally a gleam of sunshine shoots athwart the darkness to keep me back from rash deeds. Behind the sideboard I find a little cross of dark, bright hair and gold and pearls, that I lost two years ago and would not be comforted. O happy days woven in with the dark, bright hair! O golden, pearly days, come back to me again! "Never mind your gewgaws," interposes real life; "what is to be done with the things in this drawer?" Lying atop of a heap of old papers in the front-yard, waiting the match that is to glorify them into flame, I find a letter that mysteriously disappeared long since and caused me infinite alarm lest indelicate eyes might see it and indelicate hands make ignoble use of its honest and honorable meaning. I learn also sundry new and interesting facts in mechanics. I become acquainted for the first time with themodus operandiof "roller-cloths." I never understood before how the roller got inside the towel. It was one of those gentle domestic mysteries that repel even while they invite investigation. I shall not give the result of my discovery to the public. If you wish very much to find out, you can move, as I did.
But the rifts of sunshine disappear, the clouds draw together and close in. The savage walks abroad once more, and I go to bed tired of life.
I have scarcely fallen asleep, when I am reluctantly, by short and difficult stages, awakened. A rumbling, grating, strident noise first confuses, then startles me. Is it robbers? Is it an earthquake? Is it the coming of fate? I lie rigid, bathed in a cold perspiration. I hear the tread of banditti on the moaning stairs. I see the flutter of ghostly robes by the uncurtained windows. A chill, uncanny air rushes in and grips at my damp hair. I am nerved by the extremity of my terror. I will die of anything but fright. I jerk off the bedclothes, convulse into an upright posture, and glare into the darkness. Nothing. I rise softly, creep cautiously and swiftly over the floor, that always creaked, but now thunders at every footfall. A light gleams through the open door of the opposite room whence the sound issues. A familiar voice utters an exclamation which I recognize. It is Petronius, the unprincipled scoundrel, who is uncording a bed, dragging remorselessly through innumerable holes the long rope whose doleful wail came near giving me an epilepsy. My savage lets loose the dogs of war. Petronius would fain defend himself by declaring that it is morning. I indignantly deny it. He produces his watch. A fig for his watch! I stake my consciousness against twenty watches, and go to bed again; but Sleep, angry goddess, once repulsed, returns no more. The dawn comes up the sky and confirms the scorned watch. The golden daggers of the morning prick in under my eyelids, and Petronius introduces himself upon the scene once more to announce, that, if I don't wish to be corded up myself, I must abdicate that bed. The threat does not terrify me. Indeed, nothing at the moment seems more inviting than to be corded up and let alone; but duty still binds me to life, and, assuring Petronius that the just law will do that service for him, if he does not mend his ways, I slowly emerge again into the world,—the dreary, chaotic world,—the world that is never at rest.
And there is hurrying to and fro, and a clang of many voices, and the clatter of much crockery, and a lifting, and balancing, and battering against walls and curving around corners, and sundry contusions, and a great waste of expletives, and a loading of wagons, and a driving of patient oxen back and forth with me generally on the top of the load, steadying a basket of eggs with one foot, keeping a tin can of something from upsetting with the other, and both arms stretched around a very big and very square picture-frame that knocks against my nose or my chin every time the cart goes over a stone or drops into a rut, and the wind threatening to blow my hat off, and blowing it off, and my "back-hair" tumbling down,—and the old house is at last despoiled. The rooms stand bare and brown and desolate. The sun, a hand-breadth above the horizon, pours in through the unblinking windows. The last load is gone. The last man has departed. I am left alone to lock up the house and walk over the hill to the new home. Then, for the first time, I remember that I am leaving. As I pass through the door of my own room, not regretfully, I turn. I look up and down and through and through the place where I shall never rest again, and I rejoice that it is so. As I stand there, with the red, solid sunshine lying on the floor, lying on the walls, unfamiliar in its new profusion, the silence becomes audible. In the still October evening there is an effort in the air. The dumb house is striving to find a voice. I feel the struggle of its insensate frame. The old timbers quiver with the unusual strain. The strong, blind, vegetable energy agonizes to find expression, and, wrestling like a pinioned giant, the soul of matter throws off the weight of Its superincumbent inertia. Slowly, gently, most sorrowfully through the golden air cleaves a voice that is somewhat a wail, yet not untuned by love. Inarticulate at first, I catch only the low mournfulness; but it clears, it concentrates, it murmurs into cadence, it syllables into intelligence, and thus the old house speaks:—
"Child, my child, forward to depart, stay for one moment your eager feet. Put off from your brow the crown which the sunset has woven, and linger yet a little longer in the shadow which enshrouds me forever. I remember, in this parting hour, the day of days which the tremulous years bore in their bosom,—a day crimson with the woodbine's happy flush and glowing with the maple's gold. On that day a tender, tiny life came down, and stately Silence fled before the pelting of baby-laughter. Faint memories of far-off olden time were softly stirred. Blindly thrilled through all my frame a vague, dim sense of swelling buds, and singing-birds, and summer-gales,—of the purple beauty of violets, the smells of fragrant earth, and the sweetness of summer dews and darks. Many a harvest-moon since then has filled her yellow horn, and queenly Junes crowned with roses have paled before the sternness of Decembers. But Decembers and Junes alike bore royal gifts to you,—gifts to the busy brain and the awakening heart. In dell and copse and meadow and gay green-wood you drank great draughts of life. Yet, even as I watched, your eyes grew wistful. Your lips framed questions for which the Springs found no reply, and the sacred mystery of living brought its sweet, uncertain pain. Then you went away, and a shadow fell. A gleam passed out of the sunshine and a note from the robin's song. The knights that pranced on the household hearth grew faint and still, and died for want of young eyes to mark their splendor. But when your feet, ever and anon, turned homeward, they used a firmer step, and I knew, that, though the path might be rough, you trod it bravely. I saw that you had learned how doing is a nobler thing than dreaming, yet kept the holy fire burning in the holy place. But now you go, and there will be no return. The stars are faded from the sky. The leaves writhe on the greensward. The breezes wail a dirge. The summer rain is pallid like winter snow. And—O bitterest cup of all!—the golden memories of the past have vanished from your heart. I totter down to the grave, while you go on from strength to strength. The Junes that gave you life brought death to me, and you sorrow not. O child of my tender care, look not so coldly on my pain! Breathe one sigh of regret, drop one tear of pity, before we part!"
The mournful murmur ceased. I am not adamant. My savage crouched out of sight among the underbrush. I think something stirred in the back of my eyes. There was even a suspicion of dampness in front. I thrust my hand in my pocket to have my handkerchief ready in case of a catastrophe. It was an unfortunate proceeding. My pocket was crammed full. I had to push my fingers in between all manner of rubbish, to get at the required article, and when I got hold of it, I had to pull with all my might to get it out, and when it did come, out with it came a tin box of mustard seed, a round wooden box of tooth-powder, a ball of twine, a paper of picture-books, and a pair of gloves. Of course, the covers of both the boxes came off. The seed scattered over the floor. The tooth-powder puffed a white cloud into my face. The ball of twine unrolled and trundled to the other side of the room. I gathered up what I could, but, by the time order was restored and my handkerchief ready for use, I had no use for it. The stirring in the back of my eyes had stopped. The dewiness had disappeared. My savage sprang out from the underbrush and brandished his tomahawk. And to the old house I made answer as a Bushman of Caffraria might, or a Sioux of the Prae-Pilgrimic Age:—
"Old House, hush up! Why do you talk stuff? 'Golden memories' indeed! To hear you, one might suppose you were an ivied castle on the Rhine, and I a fair-haired princess, cradled in the depths of regal luxury, feeding on the blossoms of a thousand generations, and heroic from inborn royalty. 'Tender care'! Did you not wake me in the middle of the night, last summer, by trickling down water on my face from a passing shower? and did I not have to get up at that unearthly hour to move the bed, and step splash into a puddle, and come very near being floated away? Did not the water drip, drip, drip upon my writing-desk, and soak the leather and swell the wood, and stain the ribbon and spoil the paper inside, and all because you were treacherous at the roof and let it? Have you not made a perfect rattery of yourself, yawning at every possible chink and crumbling at the underpinning, and keeping me awake night after night by the tramp of a whole brigade of the Grand Army that slaughtered Bishop Hatto? Whenever a breeze comes along stout enough to make an aspen-leaf tremble, don't you immediately go into hysterics, and rock, and creak, and groan, as if you were the shell of an earthquake? Don't you shrivel at every window to let in the northeasters and all the snow-storms that walk abroad? Whenever a needle, or a pencil, or a penny drops, don't you open somewhere and take it in? 'Golden memories'! Leaden memories! Wooden memories! Madden memories!"
My savage gave a war-whoop. I turned scornfully. I swept down the staircase. I banged the front-door. I locked it with an accent, and marched up the hill. A soft sighing breathed past me. I knew it was the old house mourning for her departing child. The sun had disappeared, but the western sky was jubilant in purple and gold. The cool evening calmed me. The echoes of the war-whoop vibrated almost tenderly along the hushed hillside. I paused on the summit of the hill and looked back. Down in the valley stood the sorrowful house, tasting the first bitterness of perpetual desolation. The maples and the oaks and the beech-trees hung out their flaming banners. The pond lay dark in the shadow of the circling hills. The years called to me,—the happy, sun-ripe years that I had left tangled in the apple-blossoms, and moaning among the pines, and tinkling in the brook, and floating in the cups of the water-lilies. They looked up at me from the orchard, dark and cool. They thrilled across from the hill-tops, glowing still with the glowing sky. I heard their voice by the lilac-bush. They smiled at me under the peach-trees, and where the blackberries had ripened against the southern wall. I felt them once more in the clover-smells and the new-mown hay. They swayed again in the silken tassels of the crisp, rustling corn. They hummed with the bees in the garden-borders. They sang with the robins in the cherry-trees, and their tone was tender and passing sweet. They besought me not to cast away their memory for despite of the black-browed troop whose vile and sombre robes had mingled in with their silver garments. They prayed me to forget, but not all. They minded me of the sweet counsel we had taken together, when summer came over the hills and walked by the watercourses. They bade me remember the good tidings of great joy which they had brought me when my eyes were dim with unavailing tears. My lips trembled to their call. The war-whoop chanted itself into a vesper. A happy calm lifted from my heart and quivered out over the valley, and a comfort settled on the sad old house as I stretched forth my hands and from my inmost soul breathed down aBenedicite!
* * * * *
It may seem to some of my readers that I have wandered from my subject and forgotten the title of these articles, which purport to be a series of papers on "Methods of Study in Natural History." But some idea of the progress of Natural History, of its growth as a science, of the gradual evolving of general principles out of a chaotic mass of facts, is a better aid to the student than direct instruction upon special modes of investigation; and it is with the intention of presenting the study of Natural History from this point of view that I have chosen my title.
I have endeavored thus far to show how scientific facts have been systematized so as to form a classification that daily grows more true to Nature, in proportion as its errors are corrected by a more intimate acquaintance with the facts; but I will now attempt a more difficult task, and try to give some idea of the mental process by which facts are transformed into scientific truth. I fear that the subject may seem very dry to my readers, and I would again ask their indulgence for details absolutely essential to my purpose, but which would indeed be very wearisome, did they not lead us up to an intelligent and most significant interpretation of their meaning.
I should be glad to remove the idea that science is the mere amassing of facts. It is true that scientific results grow out of facts, but not till they have been fertilized by thought The facts must be collected, but their mere accumulation will never advance the sum of human knowledge by one step;—it is the comparison of facts and their transformation into ideas that lead to a deeper insight into the significance of Nature. Stringing words together in incoherent succession does not make an intelligible sentence; facts are the words of God, and we may heap them together endlessly, but they will teach us little or nothing till we place them in their true relations and recognize the thought that binds them together as a consistent whole.
I have spoken of the plans that lie at the foundation of all the variety of the Animal Kingdom as so many structural ideas which must have had an intellectual existence in the Creative Conception independently of any special material expression of them. Difficult though it be to present these plans as pure abstract formulae, distinct from the animals that represent them, I would nevertheless attempt to do it, in order to show how the countless forms of animal life have been generalized into the few grand, but simple intellectual conceptions on which all the past populations of the earth as well as the present creation are founded. In such attempts to divest the thought of its material expression, especially when that expression is multiplied in such thousand-fold variety of form and color, our familiarity with living animals is almost an obstacle to our success. For I shall hardly be able to allude to the formula of the Radiates, for instance,—the abstract idea that includes all the structural possibilities of that division of the Animal Kingdom,—without recalling to my readers a Polyp or a Jelly-Fish, a Sea-Urchin or a Star-Fish. Neither can I present the structural elements of the Mollusk plan, without reminding them of an Oyster or a Clam, a Snail or a Cuttle-Fish,—or of the Articulate plan, without calling up at once the form of a Worm, a Lobster, or an Insect,—or of the Vertebrate plan, without giving it the special character of Fish, Reptile, Bird, or Mammal. Yet I insist that all living beings are but the different modes of expressing these formulae, and that all animals have, within the limits of their own branch of the Animal Kingdom, the same structural elements, though each branch is entirely distinct. If this be true, and if these organic formulae have the precision of mathematical formulae, with which I have compared them, they should be susceptible of the same tests.
The mathematician proves the identity of propositions that have the same mathematical value and significance by their convertibility. If they have the same mathematical quantities, it must be possible to transform them, one into another, without changing anything that is essential in either. The problem before us is of the same character. If, for instance, all Radiates, be they Sea-Anemones, Jelly-Fishes, Star-Fishes, or Sea-Urchins, are only various modes of expressing the same organic formula, each having the sum of all its structural elements, it should be possible to demonstrate that they are reciprocally convertible. This is actually the case, and I hope to be able to convince my readers that it is no fanciful theory, but may be demonstrated as clearly as the problems of the geometer. The naturalist has his mathematics, as well as the geometer and the astronomer; and if the mathematics of the Animal Kingdom have a greater flexibility than those of the positive sciences, and are therefore not so easily resolved into their invariable elements, it is because they have the freedom and pliability of life, and evade our efforts to bring all their external variety within the limits of the same structural law which nevertheless controls and includes them all.
I wish that I could take as the illustration of this statement animals with whose structure the least scientific of my readers might be presumed to be familiar; but such a comparison of the Vertebrates, showing the identity and relation of structural elements throughout the Branch, or even in any one of its Classes, would be too extensive and complicated, and I must resort to the Radiates,—that branch of the Animal Kingdom which, though less generally known, has the simplest structural elements.
I will take, then, for the further illustration of my subject, the Radiates, and especially the class of Echinoderms, Star-Fishes, Sea-Urchins, and the like, both in the fossil and the living types; and though some special description of these animals is absolutely essential, I will beg my readers to remember that the general idea, and not its special manifestations, is the thing I am aiming at, and that, if we analyze the special parts characteristic of these different groups, it is only that we may resolve them back again into the structural plan that includes them all.
I have already in a previous article named the different Orders of this Class in their relative rank, and have compared the standing of the living ones, according to the greater or less complication of their structure, with the succession of the fossil ones. Of the five Orders, Beches-de-Mer, Sea-Urchins, Star-Fishes, Ophiurans, and Crinoids,—or, to name them all according to their scientific nomenclature, Holothurians, Echinoids, Asteroids, Ophiurans, and Crinoids,—the last-named are lowest in structure and earliest in time. Cuvier was the first naturalist who detected the true nature of the Crinoids, and placed them where they belong in the classification of the Animal Kingdom. They had been observed before, and long and laborious investigations had been undertaken upon them, but they were especially baffling to the student, because they were known only in the fossil condition from incomplete specimens; and though they still have their representatives among the type of Echinoderms as it exists at present, yet, partly owing to the rarity of the living specimens and partly to the imperfect condition of the fossil ones, the relation between them was not recognized. The errors about them certainly did not arise from any want of interest in the subject among naturalists, for no less than three hundred and eighty different authors have published their investigations upon the Crinoids, and the books that have been printed about these animals, many of which were written long before their animal nature was suspected, would furnish a library in themselves. The ancients knew little about them. The only one to be found in the European seas resembles the Star-Fish closely, and they called it Asterias; but even Aristotle was ignorant of its true structural relations, and alludes only to its motion and general appearance. Some account of the gradual steps by which naturalists have deciphered the true nature of these lowest Echinoderms and their history in past times may not be without interest, and is very instructive as showing bow such problems may be solved.
In the sixteenth century some stones were found bearing the impression of a star on their surface. They received the name of Trochites, and gave rise to much discussion. Naturalists puzzled their brains about them, called them star-shaped crystals, aquatic plants, corals; and to these last Linnaeus himself, the great authority of the time on all such questions, referred them. Beside these stony stars, which were found in great quantities when attention was once called to them, impressions of a peculiar kind had been observed in the rocks, resembling flowers on long stems, and called "stone lilies" naturally enough, for their long, graceful stems, terminating either in a branching crown or a closer cup, recall the lily tribe among flowers. The long stems of these seeming lilies are divided transversely at regular intervals;—the stem is easily broken at any of these natural divisions, and on each such fragment is stamped a star-like impression resembling those found upon the loose stones or Trochites.
About a century ago, Guettard the naturalist described a curious specimen from Porto Rico, so similar to these fossil lilies of the rocks that he believed they must have some relation to each other. He did not detect its animal nature, but from its long stem and branching crown he called it a marine palm. Thus far neither the true nature of the living specimen, nor of the Trochites, nor of the fossil lilies was understood, but it was nevertheless an important step to have found that there was a relation between them. A century passed away, and Guettard's specimen, preserved at the Jardin des Plantes, waited with Sphinx-like patience for the man who should solve its riddle.
Cuvier, who held the key to so many of the secrets of Nature, detected at last its true structure; he pronounced it to be a Star-Fish with a stem, and at once the three series of facts respecting the Trochites, the fossil lilies, and Guettard's marine palm assumed their true relation to each other. The Troehites were recognized as simply the broken portions of the stem of some of these old fossil Crinoids, and the Crinoids themselves were seen to be the ancient representatives of the present Comatulae and Star-Fishes with stems. So is it often with the study of Nature; many scattered links are collected before the man comes who sees the connection between them and speaks the word that reconstructs the broken chain.
I will begin my comparison of all Echinoderms with an analysis of the Star-Fishes and Sea-Urchins, because I think I can best show the identity of parts between them, notwithstanding the difference in their external form; the Sea-Urchins having always a spherical body, while the Star-Fishes are always star-shaped, though in some the star is only hinted at, sketched out, as it were, in a simply pentagonal outline, while in others the indentations between the rays are very deep, and the rays themselves so intricate in their ramifications as to be broken up into a complete net-work of branches. But under all this variety of outline, our problem remains always the same: to build with the same number of pieces a star and a sphere, having the liberty, however, of cutting the pieces differently and changing their relative proportions. Let us take first the Sea-Urchin and examine in detail all parts of its external structure. I shall say nothing of the internal structure of any of these animals, because it does not affect the comparison of their different forms and the external arrangement of parts, which is the subject of the present article.
On the lower side is the mouth, and we may call that side and all the parts that radiate from it the oral region. On the upper side is a small area to which the parts converge, and which, from its position just opposite the so-called mouth or oral opening, we may call theab-oral region. I prefer these more general terms, because, if we speak of the mouth, we are at once reminded of the mouth in the higher animals, and in this sense the word, as applied to the aperture through which the Sea-Urchins receive their food, is a misnomer. Very naturally the habit has become prevalent of naming the different parts of animals from their function, and not from their structure; and in all animals the aperture through which food enters the body is called the mouth, though there is not the least structural relation between the organs so designated, except within the limits of each different branch or division. To speak of these opposite regions in the Sea-Urchin as the upper and lower sides would equally mislead us, since, as we have seen, there is, properly speaking, no above and below, no right and left sides, no front and hind extremities in these animals, all parts being evenly distributed around a vertical axis. I will, therefore, although it has been my wish to avoid technicalities as much as possible in these papers, make use of the unfamiliar terms oral and ab-oral regions, to indicate the mouth with the parts diverging from it and the opposite area towards which all these parts converge. [Footnote: When reference is made to the whole structure, including the internal organs as well as the solid parts of the surface, the termsactinalandab-actinalare preferable to oral and ab-oral.]
[Illustration: Sea-Urchin seen from the oral side, showing the zones with the spines and suckers; for the ab-oral side, on the summit of which the zones unite, see February Number, p. 216.]
The whole surface of the animal is divided by zones,—ten in number, five broader ones alternating with five narrower ones. The five broad zones are composed of large plates on which are the most prominent spines, attached to tubercles that remain on the surface even when the spines drop off after death, and mark the places where the spines have been. The five small zones are perforated with regular rows of holes, and through these perforations pass the suckers or water-tubes which are their locomotive appendages. For this reason these narrower zones are called theambulacra, while the broader zones intervening between them and supporting the spines are called theinterambulacra. Motion, however, is not the only function of these suckers; they are subservient also to respiration and circulation, taking in water, which is conveyed through them into various parts of the body.
[Illustration: Portion of Sea-Urchin representing one narrow zone with a part of the broad zones on either side and the ab-oral area on the summit.]
The oral aperture is occupied by five plates, which may be called jaws, remembering always that here again this word signifies the function, and not the structure usually associated with the presence of jaws in the higher animals; and each of these jaws or plates terminates in a tooth. Even the mode of eating in these animals is controlled by their radiate structure; for these jaws, evenly distributed about the circular oral aperture, open to receive the prey and then are brought together to crush it, the points meeting in the centre, thus working concentrically, instead of moving up and down or from right to left, as in other animals. From the oral opening the ten zones diverge, spreading over the whole surface, like the ribs on a melon, and converging in the opposite direction till they meet in the small space which we have called the ab-oral region opposite the starting-point.
Here the broad zones terminate in five large plates differing somewhat from those that form the zones in other parts of the body, and called ovarian plates, because the eggs pass out through certain openings in them; while the five narrow zones terminate in five small plates on each of which is an eye, making thus five eyes alternating with five ovarian plates. The centre of this area containing the ovarian plates and the visual plates is filled up with small movable plates closing the space between them. I should add that one of the five ovarian plates is larger than the other four, and has a peculiar structure, long a puzzle to naturalists. It is perforated with minute holes, forming an exceedingly delicate sieve, and this is actually the purpose it serves. It is, as it were, a filter, and opens into a canal which conducts water through the interior of the body; closed by this sieve on the outside, all the water that passes into it is purified from all foreign substances that might be injurious to the animal, and is thus fitted to pass into the water-system, from which arise the main branches leading to the minute suckers which project through the holes in the narrow zones of plates.
[Illustration: Star-Fish from the ab-oral side.]
Now in order to transform theoretically our Sea-Urchin into a Star-Fish, what have we to do? Let the reader imagine for a moment that the small ab-oral area closing the space between the ovarian plates and the eye-plates is elastic and may be stretched out indefinitely; then split the five broad zones along the centre and draw them down to the same level with the mouth, carrying the ovarian plates between them. We have then a star, just as, dividing, for instance, the peel of an orange into five compartments, leaving them, of course, united at the base, then stripping it off and spreading it out flat, we should have a five-rayed star.
[Illustration: One arm of Star-Fish from the oral side.]
But in thus dividing the broad zones of the Sea-Urchins, we leave the narrow zones in their original relation to them, except that every narrow zone, instead of being placed between two broad zones, has now one-half of each of the zones with which it alternated in the Sea-Urchin on either side of it and lies between them. The adjoining wood-cut represents a single ray of a Star-Fish, drawn from what we call its lower side or the oral side. Along the centre of every such ray, diverging from the central opening or the mouth, we have a furrow, corresponding exactly to the narrower zones of the Sea-Urchin. It is composed of comparatively small perforated plates through which pass the suckers or locomotive appendages. On either side of the furrows are other plates corresponding to the plates of the broad zones in the Sea-Urchin. Where shall we look for the five eyes? Of course, at the tip of every ray; exactly where they were when the rays were drawn up to form the summit of a sphere, so that the eyes, which are now at their extremities, were clustered together at their point of meeting. Where shall we look for the ovarian plates? At each angle of the five rays, because, when the broad zones of which they formed the summit were divided, they followed the split, and now occupy the place which, though it seems so different on the surface of the Star-Fish, is nevertheless, relatively to the rest of the body, the same as they occupied in the Sea-Urchin. Assuming, as we premised, that the central area of the ab-oral region, forming the space between the plates at the summit of the zones in the Sea-Urchin, is elastic, it has stretched with the spreading out of the zones, following the indentation between the rays, and now forms the whole upper surface of the body. All the internal organs of the animal lie between the oral and ab-oral regions, just as they did in the Sea-Urchin, only that in the Star- Fish these regions are coequal in extent, while in the Sea-Urchin the ab-oral region is very contracted, and the oral region with the parts belonging to it occupies the greater part of its surface.
Such being the identity of parts between a Star-Fish and a Sea-Urchin, let us see now how the Star-Fish may be transformed into the Pedunculated Crinoid, the earliest representative of its Class, or into a Comatula, one of the free animals that represent the Crinoids in our day.
[Illustration: Crinoid with branching crown; oral side turned upward.]
We have seen that in the Sea-Urchins the ab-oral region is very contracted, the oral region and the parts radiating from it and forming the sides being the predominant features in the structure; and we shall find, as we proceed in our comparison, that the different proportion of these three parts, the oral and ab-oral regions and the sides, determines the different outlines of the various Orders in this Class. In the Sea-Urchin the oral region and the sides are predominant, while the ab-oral region is very small. In the Star-Fish, the oral and ab-oral regions are brought into equal relations, neither preponderating over the other, and the sides are compressed, so that, seen in profile, the outline of the Star-Fish is that of a slightly convex disk, instead of a sphere, as in the Sea-Urchin. But when we come to the Crinoids, we find that the great preponderance of the ab-oral region determines all that peculiarity of form that distinguishes them from the other Echinoderms, while the oral region is comparatively insignificant. The ab-oral region in the Crinoid rises to form a sort of cup-like or calyx-like projection. The plates forming it, which in the Star-Fish or the Sea-Urchin are movable, are soldered together so as to be perfectly immovable in the Crinoid. Let this seeming calyx be now prolonged into a stem, and we see at once how striking is the resemblance to a flower; turn it downwards, an attitude which is natural to these Crinoids, and the likeness to a drooping lily is still more remarkable The oral region, with the radiating ambulacra, is now limited to the small flat area opposite the juncture of the stem with the calyx; and whether it stretches out to form long arms, or is more compact, so as to close the calyx like a cup, it seems in either case to form a flower-like crown. In these groups of Echinoderms the interambulacral plates are absent; there are no rows of plates of a different kind alternating with the ambulacral ones, as in the Sea-Urchins and the Star-Fishes, but the ab-oral region closes immediately upon the ambulacra.
It seems a contradiction to say, that, though these Crinoids were the only representatives of their Class in the early geological ages, while it includes five Orders at the present time, Echinoderms were as numerous and various then as now. But, paradoxical as it may seem, this is nevertheless true, not only for this Class, but for many others in the Animal Kingdom. The same numerical proportions, the same richness and vividness of conception were manifested in the early creation as now; and though many of the groups were wanting that are most prominent in modern geological periods, those that existed were expressed in such endless variety that the Animal Kingdom seems to have been as full then as it is to-day. The Class of the Echinoderms is one of the most remarkable instances of this. In the Silurian period, the Crinoids stood alone; there were neither Ophiurans, Asteroids, Echinoids, nor Holothurians; and yet in one single locality, Lockport, in the State of New York, over an area of not more than a few square miles, where the Silurian deposits have been carefully examined, there have been found more different Species of Echinoderms than are living now along our whole Atlantic coast from Maine to Florida.
There is nothing more striking in these early populations of the earth than the richness of the types. It would seem as if, before the world was prepared for the manifold existences that find their home here now, when organic life was limited by the absence of many of the present physical conditions, the whole wealth of the Creative Thought lavished itself upon the forms already introduced upon the globe. After thirty years' study of the fossil Crinoids, I am every day astonished by some new evidence of the ingenuity, the invention, the skill, if I may so speak, shown in varying this single pattern of animal life. When one has become, by long study of Nature, in some sense intimate with the animal creation, it is impossible not to recognize in it the immediate action of thought, and even to specialize the intellectual faculties it reveals. It speaks of an infinite power of combination and analysis, of reminiscence and prophecy, of that which has been in eternal harmony with that which is to be; and while we stand in reverence before the grandeur of the Creative Conception as a whole, there breaks from it such lightness of fancy, such richness of invention, such variety and vividness of color, nay, even the ripple of mirthfulness,—for Nature has its humorous side also,—that we lose our grasp of its completeness in wonder at its details, and our sense of its unity is clouded by its marvellous fertility. There may seem to be an irreverence in thus characterizing the Creative Thought by epithets which we derive from the exercise of our own mental faculties; but it is nevertheless true, that, the nearer we come to Nature, the more does it seem to us that all our intellectual endowments are merely the echo of the Almighty Mind, and that the eternal archetypes of all manifestations of thought in man are found in the Creation of which he is the crowning work.
In no group of the Animal Kingdom is the fertility of invention more striking than in the Crinoids. They seem like the productions of one who handles his work with an infinite ease and delight, taking pleasure in presenting the same thought under a thousand different aspects. Some new cut of the plates, some slight change in their relative position is constantly varying their outlines, from a close cup to an open crown, from the long pear-shaped oval of the calyx in some to its circular or square or pentagonal form in others. An angle that is simple in one projects by a fold of the surface and becomes a fluted column in another; a plate that was smooth but now has here a symmetrical figure upon it drawn in beaded lines; the stem which is perfectly unbroken in one, except by the transverse divisions common to them all, in the next puts out feathery plumes at every such transverse break. In some the plates of the stem are all rigid and firmly soldered together; in others they are articulated upon each other in such a manner as to give it the greatest flexibility, and allow the seeming flower to wave and bend upon its stalk. It would require an endless number of illustrations to give even a faint idea of the variety of these fossil Crinoids. There is no change that the fancy can suggest within the limits of the same structure that does not find expression among them. Since I have become intimate with their wonderful complications, I have sometimes amused myself with anticipating some new variation of the theme, by the introduction of some undescribed structural complication, and then seeking for it among the specimens at my command, and I have never failed to find it in one or other of these ever-changing forms.
The modern Crinoid without stem, or the Comatula, though agreeing with the ancient in all the essential elements of structure, differs from it in some specific features. It drops its stem when full-grown, though the ab-oral region still remains the predominant part of the body and retains its cup-like or calyx-like form. The Comatulae are not abundant, and though represented by a number of Species, yet the type as it exists at present is meagre in comparison to its richness in former times. Indeed, this group of Echinoderms, which in the earliest periods was the exponent of all its kind, has dwindled gradually, in proportion as other representatives of the Class have come in, and there exists only one species now, the Pentacrinus of the West Indies, which retains its stem in its adult condition. It is a singular fact, to which I have before alluded, and which would seem to have especial reference to the maintenance of the same numeric proportions in all times, that, while a Class is represented by few types, those types are wonderfully rich and varied, but in proportion as other expressions of the same structure are introduced, the first dwindle, and, if they do not entirely disappear, become at least much less prominent than before.
[Illustration: Ophiuran; showing one ray from the oral side.]
There remain only two other Orders to be considered, the Ophiurans and the Holothurians. The Ophiurans approach the Crinoids more nearly than any other group of Echinoderms, and in our classifications are placed next above them. In them the ab-oral region, which has such a remarkable predominance in the Crinoid, has become depressed; it no longer extends into a stem, nor does it even rise into the calyx-like or cup-like projection so characteristic of the Crinoids,—though, when the animal is living, the ab-oral side of the disk is still quite convex. The disk in the Ophiurans is small in comparison to the length of the arms, and perfectly circular; it does not merge gradually in the arms as in the Star-Fish, but the arms start abruptly from its periphery. In these, as in the Crinoids, the interambulacral plates are absent, and the interambulacral spaces are filled by an encroachment of the ab-oral region upon them. There is an infinite variety and beauty both of form and color in these Sea-Stars. The arms frequently measure many times the diameter of the whole disk, and are so different in size and ornamentation in the different Species that at first sight one might take them for animals entirely distinct from each other. In some the arms are comparatively short and quite simple,—in others they are very long, and may be either stretched to their full length or partly contracted to form a variety of graceful curves; in some they are fringed all along the edges,—in others they are so ramified that every arm seems like a little bush, as it were, and, intertwining with each other, they make a thick network all around the animal. In the geological succession, these Ophiurans follow the Crinoids, being introduced at about the Carboniferous period, and perhaps earlier. They have had their representatives in all succeeding times, and are still very numerous in the present epoch.
To show the correspondence of the Holothurians with the typical formula of the whole class of Echinoderms, I will return to the Sea-Urchins, since they are more nearly allied with that Order than with any of the other groups. We have seen that the Sea-Urchins approach most nearly to the sphere, and that in them the oral region and the sides predominate so greatly over the ab-oral region that the latter is reduced to a small area on the summit of the sphere. In order to transform the Sea-Urchin into a Holothurian, we have only to stretch it out from end to end till it becomes a cylinder, with the oral region or mouth at one extremity, and the ab-oral region, which in the Holothurian is reduced to its minimum, at the other. The zones of the Sea-Urchin now extend as parallel rows on the Holothurian, running from one end to the other of the long cylindrical body. On account of their form, some of them have been taken for Worms, and so classified by naturalists; but as soon as their true structure was understood, which agrees in every respect with that of the other Echinoderms, and has no affinity whatever with the articulated structure of the Worms, they found their true place in our classifications.
[Illustration: Holothurian.]
The natural attitude of these animals is different from that of the other Echinoderms: they lie on one side, and move with the oral opening forward, and this has been one cause of the mistakes as to their true nature. But when we would compare animals, we should place them, not in the attitude which is natural to them in their native element, but in what I would call their normal position,—that is, such a position as brings the corresponding parts in all into the same relation. For instance, the natural attitude of the Crinoid is with the ab-oral region downward, attached to a stem, and the oral region or mouth upward; the Ophiuran turns its oral region, along which all the suckers or ambulacra are arranged, toward the surface along which it moves; the Star-Fish does the same; the Sea-Urchin also has its oral opening downward; but the Holothurian moves on one side, mouth foremost, as represented in the adjoining wood-cut, dragging itself onward, like all the rest, by means of its rows of suckers. If, now, we compare these animals in the various attitudes natural to them, we may fail to recognize the identity of parts, or, at least, it will not strike us at once. But if we place them all—Holothurian, Sea-Urchin, Star-Fish, Ophiuran, and Crinoid—with the oral or mouth side downward, for instance, we shall see immediately that the small area at the opposite end of the Holothurian corresponds to the area on the top of the Sea-Urchin; that the upper side of the Star-Fish is the same region enlarged; that, in the Ophiuran, that region makes one side of the small circular disk; while in the Crinoid it is enlarged and extended to make the calyx-like projection and stem. In the same way, if we place them in the same attitude, we shall see that the long, straight rows of suckers along the length of the Holothurian, and the arching zones of suckers on the spherical body of the Sea-Urchin, and the furrows with the suckers protruding from them along the arms of the Star-Fish and Ophiuran, and the radiating series of pores from the oral opening in the Crinoid are one and the same thing in all, only altered somewhat in their relative proportion and extent. Around the oral opening of the Holothurian there are appendages capable of the most extraordinary changes, which seem at first to be peculiar to these animals, and to have no affinity with any corresponding feature in the same Class. But a closer investigation has shown them to be only modifications of the locomotive suckers of the Star-Fish and Sea-Urchin, but ramifying to such an extent as to assume the form of branching feelers. The little tufts projecting from the oral side in the Sea-Urchins, described as gills, are another form of the same kind of appendage.
The Holothurians have not the hard, brittle surface of the other Echinoderms; on the contrary, their envelope is tough and leathery, capable of great contraction and dilatation. No idea can be formed of the beauty of these animals either from dried specimens or from those preserved in alcohol. Of course, in either case, they lose their color, become shrunken, and the movable appendages about the mouth shrivel up. One who had seen the Holothurian only as preserved in museums would be amazed at the spectacle of the living animal, especially if his first introduction should be to one of the deep, rich crimson-colored species, such as are found in quantities in the Bay of Fundy. I have seen such an animal, when first thrown into a tank of sea-water, remain for a while closely contracted, looking like a soft crimson ball. Slowly, almost imperceptibly, as it becomes accustomed to its new position, it begins to elongate; the fringes creep softly out, spreading gradually all their ramifications, till one end of the animal seems crowned with feathery, crimson sea-weeds of the most delicate tracery. It is much to be regretted that these lower marine animals are not better known. The plumage of the tropical birds, the down on the most brilliant butterfly's wing, are not more beautiful in coloring than the hues of many Radiates, and there is no grace of motion surpassing the movements of some of them in their native element. The habit of keeping marine animals in tanks is happily growing constantly more popular, and before long the beauty of these inhabitants of the ocean will be as familiar to us as that of Birds and Insects. Many of the most beautiful among them are, however, difficult to obtain, and not easily kept alive in confinement, so that they are not often seen in aquariums.
Having thus endeavored to sketch each different kind of Echinoderm, let us try to forget them all in their individuality, and think only of the structural formula that applies equally to each. In all, the body has three distinct regions, the oral, the ab-oral, and the sides; but by giving a predominance to one or other of these regions, a variety of outlines characteristic of the different groups is produced. In all, the parts radiate from the oral opening, and join in the ab-oral region. In all, this radiation is accompanied by rows of suckers following the line of the diverging rays. It is always the same structure, but, endowed with the freedom of life, it is never monotonous, notwithstanding its absolute permanence. In short, drop off the stem of the Crinoid, and depress its calyx to form a flat disk, and we have an Ophiuran; expand that disk, and let it merge gradually in the arms, and we have a Star-Fish; draw up the rays of the Star-Fish, and unite them at the tips so as to form a spherical outline, and we have a Sea-Urchin; stretch out the Sea-Urchin to form a cylinder, and we have a Holothurian.
And now let me ask,—Is it my ingenuity that has imposed upon these structures the conclusion I have drawn from them?—have I so combined them in my thought that they have become to me a plastic form, out of which I draw a Crinoid, an Ophiuran, a Star-Fish, a Sea-Urchin, or a Holothurian at will? or is this structural idea inherent in them all, so that every observer who has a true insight into their organization must find it written there? Had our scientific results anything to do with our invention, every naturalist's conclusions would be colored by his individual opinions; but when we find all naturalists converging more and more towards each other, arriving, as their knowledge increases, at exactly the same views, then we must believe that these structures are the Creative Ideas in living reality. In other words, so far as there is truth in them, our systems are what they are, not because Aristotle, Linnaeus, Cuvier, or all the men who ever studied Nature, have so thought and so expressed their thought, but because God so thought and so expressed His thought in material forms when He laid the plan of Creation, and when man himself existed only in the intellectual conception of his Maker.