PART III

[180:1]Cf. §68.

[182:2]The Socratic distinction between the logical and the psychological treatment of belief finds its best expression in Plato'sGorgias, especially, 454, 455. Cf. also §29.

[182:3]Thus, e. g. Hegel. See §179. Cf. also §§199,200.

[183:4]Cf. §84.

[184:5]See § 69,note.

[184:6]The reader will find a good illustration of eristic in Plato'sEuthydemus, 275.

[187:7]The reader can find these rules, and the detail of the traditional formal logic, in any elementary text-book, such as, e. g., Jevons:Elements of Logic.

[189:8]What is called "the algebra of logic" seeks to obtain an unequivocal symbolic expression for these truths.

[192:9]Plato:Protagoras, 351. Translation by Jowett.

[194:10]Plato:Apology, 41. Translation by Jowett.

[195:11]Quoted by Paulsen in hisSystem of Ethics. Translation by Thilly, p. 69.

[198:12]Cf. §160.

[198:13]Cf. §177.

[199:14]Concerning the duty of philosophy to religion in these matters, cf. Descartes:Meditations,Dedication. Translation by Veitch, p. 81.

[201:15]The school-philosophy that flourished from the eleventh to the fifteenth century, under the authority of the church.

[209:16]Especially in thePhædo.

[211:17]Schopenhauer is a notable exception. Cf. §§135,138.

[213:18]It is interesting, however, to observe that current spiritualistic theories maintain a naturalistic theory of immortality, verifiable, it is alleged, in certain extraordinary empirical observations.

[215:19]Translation by Pillsbury and Titchener, p. 59.

The General Meaning of Materialism.

§102. The meaning conveyed by any philosophical term consists largely of the distinctions which it suggests. Its peculiar quality, like the physiognomy of the battle-scarred veteran, is a composite of the controversies which it has survived. There is, therefore, an almost unavoidable confusion attendant upon the denomination of any early phase of philosophy asmaterialism. But in the historical beginnings of thought, as also in the common-sense of all ages, there is at any rate present a very essential strand of this theory. The naive habit of mind which, in the sixth century before Christ, prompted successive Greek thinkers to define reality in termsof water, air, and fire, is in this respect one with that exhibited in Dr. Samuel Johnson's smiting the ground with his stick in curt refutation of Bishop Berkeley's idea-philosophy. There is a theoretical instinct, not accidental or perverse, but springing from the very life-preserving equipment of the organism, which attributes reality totangible space-filling things encountered by the body. For obvious reasons of self-interest the organism is first of all endowed with a sense of contact, and the more delicate senses enter into its practical economy as means of anticipating or avoiding contact. From such practical expectations concerning the proximity of that which may press upon, injure, or displace the body, arise the first crude judgments of reality. And these are at the same time the nucleus of naive philosophy and the germinal phase of materialism.

Corporeal Being.

§103. The first philosophical movement among the Greeks was a series of attempts to reduce the tangible world to unity, and of these the conception offered by Anaximander is of marked interest in its bearing upon the development of materialism. This philosopher is remarkable for havingdefinedhis first principle, instead of having chosen it from among thedifferent elements already distinguished by common-sense. He thought the unity of nature to consist in its periodic evolution from and return into one infinite sum of material (τὸ ἄπειρον), which, much in the manner of the "nebula" of modern science, is conceived as both indeterminate in its actual state and infinitely rich in its potentiality. The conception of matter, the most familiar commonplace of science, begins to be recognizable. It has here reached the point of signifying a common substance for all tangible things, a substance that in its own general and omnipresent nature is without the special marks that distinguish these tangible things from one another. And in so far the philosophy of Anaximander is materialistic.

Corporeal Processes. Hylozoism and Mechanism.

§104. But the earliest thinkers are said to behylozoists, rather than strict materialists, because of their failure to make certain distinctions in connection with theprocessesof matter. The term hylozoism unites with the conception of the formless material of the world (ὕλη), that of an animating power to which its formations and transformations are due. Hylozoism itself was not a deliberate synthesis of these two conceptions, but a primitive practical tendency to universalize the conception, of life.Such "animism" instinctively associates with an object's bulk and hardness a capacity for locomotion and general initiative. And the material principles defined by the philosophers retain this vague and comprehensive attribute as a matter of course, until it is distinguished and separated through attempts to understand it.

That aspect of natural process which was most impressive to Greek minds of the reflective type was the alternation of "generation and decay." In full accord with his more ancient master, Epicurus, the Latin poet Lucretius writes:

"Thus neither can death-dealing motions keep the mastery always, nor entomb existence forevermore; nor, on the other hand, can the birth and increase giving motions of things preserve them always after they are born. Thus the war of first beginnings waged from eternity is carried on with dubious issue: now here, now there, the life-bringing elements of things get the mastery and are o'ermastered in turn: with the funeral wail blends the cry which babies raise when they enter the borders of light; and no night ever followed day, nor morning night, that heard not, mingling with the sickly infant's cries, wailings of the attendants on death and black funeral."[226:2]

In a similar vein, the earliest conceptions of natural evolution attributed it to the coworking oftwo principles, that of Love or union and that of Hate or dissolution. The process is here distinguished from the material of nature, but is still described in the language of practical life. A distinction between two aspects of vital phenomena is the next step. These may be regarded in respect either of the motion and change which attend them, or the rationality which informs them. Life is both effective and significant. Although neither of these ideas ever wholly ceases to be animistic, they may nevertheless be applied quite independently of one another. The one reduces the primitive animistic world to the lower end of its scale, the other construes it in terms of a purposive utility commensurable with that of human action. Now it is withmechanism, the former of these diverging ways, that the development of materialism is identified. For this philosophy a thing need have no value to justify its existence, nor any acting intelligence to which it may owe its origin. Its bulk and position are sufficient for its being, and the operation of forces capable of integrating, dividing, or moving it is sufficient for its derivation and history. In short, there is no rhyme or reason at the heart of things, but only actual matter distributed by sheer force. With this eliminationof the element of purposiveness from the hylozoistic world, the content and process of nature are fitted to one another. Matter is that which is moved by force, and force is the determining principle of the motions of matter. Materialism is now definitely equipped with its fundamental conceptions.

Materialism and Physical Science.

§105. The central conceptions of materialism as a philosophical theory differ from those employed in the physical sciences only in what is demanded of them. The scientist reports upon physical phenomena without accepting any further responsibility, while those who like Lucretius maintain a physical metaphysics, must, like him, prove that "the minute bodies of matter from everlasting continually uphold the sum of things." But, though they employ them in their own way, materialists and all other exponents of naturalism derive their central conceptions from the physical sciences, and so reflect the historical development through which these sciences have passed. To certain historical phases of physical science, in so far as these bear directly upon the meaning of naturalism, we now turn.

The Development of the Conceptions of Physical Science. Space and Matter.

§106. From the earliest times down to the present day the groundwork of materialism hasmost commonly been cast in the form of anatomic theory. Democritus, the first system-builder of this school, adopted the conception of indivisible particles (ἄτομοι), impenetrable in their occupancy of space, and varying among themselves only in form, order, and position. To provide for the motion that distributes them he conceived them as separated from one another by empty space. From this it follows that the void is as real as matter, or, as Democritus himself is reputed to have said, "thing is not more real than no-thing."

But atomism has not been by any means universally regarded as the most satisfactory conception of the relation between space and matter. Not only does it require two kinds of being, with the different attributes of extension and hardness, respectively,[229:3]but it would also seem to be experimentally inadequate in the case of the more subtle physical processes, such as light. The former of these is a speculative consideration, and as such had no little weight with the French philosopher Descartes, whose divisions and definitions so profoundly affected the course of thought in thesematters after the sixteenth century. Holding also "that a vacuum or space in which there is absolutely no body is repugnant to reason," and that an indivisible space-filling particle is self-contradictory, he was led toidentify space and matter; that is, to make matter as indispensable to space as space to matter. There is, then, but one kind of corporeal being, whose attribute is extension, and whose modes are motion and rest. The most famous application of the mechanical conceptions which he bases upon this first principle, is his theory of the planets, which are conceived to be embedded in a transparent medium, and to move with it, vortex fashion, about the sun.[230:4]

But the conception of the space-filling continuity of material substance owes its prominence at the present time to the experimental hypothesis ofether. This substance, originally conceived to occupy the intermolecular spaces and to serve as a medium for the propagation of undulations, is now regarded by many physicists as replacing matter. "It is the great hope of science at the present day," says a contemporary exponent of naturalism, "that hard and heavy matter will beshown to be ether in motion."[231:5]Such a theory would reduce bodies to the relative displacements of parts of a continuous substance, which would be first of all defined as spacial, and would possess such further properties as special scientific hypotheses might require.

Two broadly contrasting theories thus appear: that which defines matter as a continuous substance coextensive with space; and that which defines it as a discrete substance divided by empty space. But both theories are seriously affected by the peculiarly significant development of the conception of force.

Motion and its Cause. Development and Extension of the Conception of Force.

§107. In the Cartesian system the cause of motion was pressure within a plenum. But in the seventeenth century this notion encountered the system of Newton, a system which seemed to involve action at a distance. In the year 1728 Voltaire wrote from London:

"When a Frenchman arrives in London, he finds a very great change, in philosophy as well as in most other things. In Paris he left the world all full of matter; here he finds absolute vacua. At Paris the universe is seen filled up with ethereal vortices, while here the samespace is occupied with the play of the invisible forces of gravitation. In Paris the earth is painted for us longish like an egg, and in London it is oblate like a melon. At Paris the pressure of the moon causes the ebb and flow of tides; in England, on the other hand, the sea gravitates toward the moon, so that at the same time when the Parisians demand high water of the moon, the gentlemen of London require an ebb."[232:6]

But these differences are not matters of taste, nor even rival hypotheses upon an equal footing. The Newtonian system of mechanics, the consummation of a development initiated by Galileo, differed from the vortex theory of Descartes as exact science differs from speculation and unverified conjecture. And this difference of method carried with it eventually certain profound differences of content, distinguishing the Newtonian theory even from that of Democritus, with which it had so much in common. Although Democritus had sought to avoid the element of purposiveness in the older hylozoism by referring the motions of bodies as far as possible to the impact of other bodies, he nevertheless attributed these motions ultimately toweight, signifying thereby a certaindownward disposition. Now it is true that in his general belief Newton himself is not free from hylozoism. He thought of the motions of theplanets themselves as initiated and quickened by a power emanating ultimately from God. They are "impressed by an intelligent Agent," and

"can be the effect of nothing else than the wisdom and skill of a powerful ever-living Agent who, being in all places, is more able by his will to move the bodies within his boundless uniformsensorium, and thereby to form and reform the parts of the universe, than we are by our will to move the parts of our own bodies."[233:7]

But by the side of these statements must be set his famous disclaimer, "hypotheses non fingo." In his capacity of natural philosopher he did not seek to explain motions, but only to describe them. Disbelieving as he did in action at a distance, he saw no possibility of explanation short of a reference of them to God; but such "hypotheses" he thought to be no proper concern of science. As a consequence, the mathematical formulation of motions came, through him, to be regarded as the entire content of mechanics. The notion of an efficient cause of motion is still suggested by the termforce, but even this term within the system of mechanics refers always to a definite amount of motion, or measurement of relative motion. And the same is true ofattraction,action,reaction, and the like. The further explanation of motion, the definition of a virtue or potency that produces it, first a neglected problem, then an irrelevant problem, is finally, for a naturalistic philosophy in which this progression is completed, an insoluble problem. For the sequel to this purely descriptive procedure on the part of science is the disavowal of "metaphysics" by those who will have no philosophy but science. Thus the scientific conservatism of Newton has led to the positivistic and agnostic phase of naturalism. But a further treatment of this development must be reserved until the issue of epistemology shall have been definitely raised.

A different emphasis within the general mechanical scheme, attaching especial importance to the conceptions of force and energy, has led to a rival tendency in science and a contrasting type of naturalism. The mechanical hypotheses hitherto described are all of a simple and readily depicted type. They suggest an imagery quite in accord with common-sense and with observation of the motions of great masses like the planets. Material particles are conceived to move within a containing space; the motions of corpuscles, atoms, or the minute parts of ether, differing only in degreefrom those of visible bodies. The whole physical universe may be represented in the imagination as an aggregate of bodies participating in motions of extraordinary complexity, but of one type. But now let the emphasis be placed upon the determining causes rather than upon the moving bodies themselves. In other words, let the bodies be regarded as attributive and the forces as substantive. The result is a radical alteration of the mechanical scheme and the transcendence of common-sense imagery. This was one direction of outgrowth from the work of Newton. His force of gravitation prevailed between bodies separated by spaces of great magnitude. Certain of the followers of Newton, notably Cotes, accepting the formulas of the master but neglecting his allusions to the agency of God, accepted the principle of action at a distance.Force, in short,was conceived to pervade space of itself. But if force be granted this substantial and self-dependent character, what further need is there of matter as a separate form of entity? For does not the presence of matter consist essentially in resistance, itself a case of force? Such reflections as these led Boscovich and others to the radical departure of defining material particlesas centres of force.

The Development and Extension of the Conception of Energy.

§108. But a more fruitful hypothesis of the same general order is due to the attention directed to the conception ofenergy, or capacity for work, by experimental discoveries of the possibility of reciprocal transformations without loss, of motion, heat, electricity, and other processes. The principle of the conservation of energy affirms the quantitative constancy of that which is so transformed, measured, for example, in terms of capacity to move units of mass against gravity. The exponents of what is called "energetics" have in many cases come to regard that the quantity of which is so conserved, as a substantial reality whose forms and distributions compose nature. A contemporary scientist, whose synthetic and dogmatic habit of mind has made him eminent in the ranks of popular philosophy, writes as follows:

"Mechanical and chemical energy, sound and heat, light and electricity, are mutually convertible; they seem to be but different modes of one and the same fundamental force orenergy. Thence follows the important thesis of the unity of all natural forces, or, as it may also be expressed, the 'monism of energy.'"[236:8]

The conception of energy seems, indeed, to afford an exceptional opportunity to naturalism. We have seen that the matter-motion theory was satisfied to ignore, or regard as insoluble, problems concerning the ultimate causes of things. Furthermore, as we shall presently see to better advantage, the more strictly materialistic type of naturalism must regard thought as an anomaly, and has no little difficulty with life. But the conception of energy is more adaptable, and hence better qualified to serve as a common denominator for various aspects of experience. The very readiness with which we can picture the corpuscular scheme is a source of embarrassment to the seeker after unity. That which is so distinct is bristling with incompatibilities. The most aggressive materialist hesitates to describe thought as a motion of bodies in space. Energy, on the other hand, exacts little if anything beyond the character of measurable power. Thought is at any rate in some sense a power, and to some degree measurable. Recent discoveries of the dependence of capacity for mental exertion upon physical vitality and measurements of chemical energy received into the systemas food, and somehow exhausted by the activities of thought, have lent plausibility to the hypothesis of a universal energy of which physical and "psychical" processes are alike manifestations. And the conception of energy seems capable not only of unifying nature, but also of satisfying the metaphysical demand for an efficient and moving cause. This term, like "force" and "power," is endowed with such a significance by common sense. Indeed, naturalism would seem here to have swung round toward its hylozoistic starting-point. The exponent of energetics, like the naive animistic thinker, attributes to nature a power like that which he feels welling up within himself. When he acts upon the environment, like meets like. Energetics, it is true, may obtain a definite meaning for its central conception from the measurable behavior of external bodies, and a meaning that may be quite free from vitalism or teleology. But in his extension of the conception the author of a philosophical energetics abandons this strict meaning, and blends his thought even with a phase of subjectivism, known aspanpsychism.[238:9]This theory regards the inward life of all nature as homogeneous with an immediately felt activity orappetency, as energetics finds the inner life to be homogeneous with the forces of nature. Both owe their philosophical appeal to their apparent success in unifying the world upon a direct empirical basis, and to their provision for the practical sense of reality.

Such, in brief, are the main alternatives available for a naturalistic theory of being, in consequence of the historical development of the fundamental conceptions of natural science.

The Claims of Naturalism.

§109. We turn now to an examination of the manner in which naturalism, equipped with working principles, seeks to meet the special requirements of philosophy. The conception of the unity of nature is directly in the line of a purely scientific development, but naturalism takes the bold and radical step of regarding nature so unified as coextensive with the real, or at any rate knowable, universe. It will be remembered that among the early Greeks Anaxagoras had referred the creative and formative processes of nature to a non-natural or rational agency, which he called theNous. The adventitious character of this principle, the external and almost purely nominal part which it played in the actual cosmology of Anaxagoras, betrayed it into the handsof the atomists, with their more consistently naturalistic creed. Better, these maintain, the somewhat dogmatic extension of conceptions proved to be successful in the description of nature, than a vague dualism which can serve only to distract the scientific attention and people the world with obscurities. There is a remarkable passage in Lucretius in which atomism is thus written large and inspired with cosmical eloquence:

"For verily not by design did the first-beginnings of things station themselves each in its right place guided by keen intelligence, nor did they bargain sooth to say what motions each should assume, but because many in number and shifting about in many ways throughout the universe, they are driven and tormented by blows during infinite time past, after trying motions and unions of every kind at length they fall into arrangements such as those out of which our sum of things has been formed, and by which too it is preserved through many great years, when once it has been thrown into the appropriate motions, and causes the streams to replenish the greedy sea with copious river waters, and the earth, fostered by the heat of the sun, to renew its produce, and the race of living things to come up and flourish, and the gliding fires of ether to live: all which these several things could in no wise bring to pass, unless a store of matter could rise up from infinite space, out of which store they are wont to make up in due season whatever has been lost."[240:10]

The prophecy of La Place, the great French mathematician, voices the similar faith of theeighteenth century in a mechanical understanding of the universe:

"The human mind, in the perfection it has been able to give to astronomy, affords a feeble outline of such an intelligence. Its discoveries in mechanics and in geometry, joined to that of universal gravitation, have brought it within reach of comprehending in the same analytical expressions the past and future states of the system of the world."[241:11]

As for God, the creative and presiding intelligence, La Place had "no need of any such hypothesis."

The Task of Naturalism.

§110. But these are the boasts of Homeric heroes before going into battle. The moment such a general position is assumed there arise sundry difficulties in the application of naturalistic principles to special interests and groups of facts. It is one thing to project a mechanical scheme in the large, but quite another to make explicit provision within it for the origin of nature, for life, for the human self with its ideals, and for society with its institutions. The naturalistic method of meeting these problems involves a reduction all along the line in the direction of such categories as are derived from the infra-organic world. That which is not like theplanetary system must be construed as mechanical by indirection and subtlety.

The Origin of the Cosmos.

§111. The origin of the present known natural world was the first philosophical question to be definitely met by science. The general form of solution which naturalism offers is anticipated in the most ancient theories of nature. These already suppose that the observed mechanical processes of the circular or periodic type, like the revolutions and rotations of the stars, are incidents in a historical mechanical process of a larger scale. Prior to the present fixed motions of the celestial bodies, the whole mass of cosmic matter participated in irregular motions analogous to present terrestrial redistributions. Such motions may be understood to have resulted in the integration of separate bodies, to which they at the same time imparted a rotary motion. It is such a hypothesis that Lucretius paints in his bold, impressionistic colors.

But the development of mechanics paved the way for a definite scientific theory, the so-called "nebular hypothesis," announced by La Place in 1796, and by the philosopher Kant at a still earlier date. Largely through the Newtonian principle of the parallelogram of forces, the present masses,orbits, and velocities were analyzed into a more primitive process of concentration within a nebulous or highly diffused aggregate of matter. And with the aid of the principle of the conservation of energy this theory appears to make possible the derivation of heat, light, and other apparently non-mechanical processes from the same original energy of motion.

But a persistently philosophical mind at once raises the question of the origin of this primeval nebula itself, with a definite organization and a vast potential energy that must, after all, be regarded as a part of nature rather than its source. Several courses are here open to naturalism. It may maintain that the question of ultimate origin is unanswerable; it may regard such a process of concentration as extending back through an infinitely long past;[243:12]or, and this is the favorite alternative for more constructive minds, the historical cosmical process may be included within a still higher type of periodic process, which is regarded as eternal. This last course has been followed in the well-known synthetic naturalism of Herbert Spencer. "Evolution," he says, "is theprogressive integration of matter and dissipation of motion." But such a process eventually runs down, and may be conceived as giving place to a counter-process of devolution which scatters the parts of matter and gathers another store of potential motion. The two processes in alternation will then constitute a cosmical system without beginning or end.

In such wise a sweeping survey of the physical universe may be thought in the terms of natural science. The uniformitarian method in geology, resolving the history of the crust of the earth into known processes, such as erosion and igneous fusion;[244:13]and spectral analysis, with its discoveries concerning the chemical constituents of distant bodies through the study of their light, have powerfully reënforced this effort of thought, and apparently completed an outline sketch of the universe in terms of infra-organic processes.

Life. Natural Selection.

§112. But the cosmos must be made internally homogeneous in these same terms. There awaits solution, in the first place, the serious problem of the genesis and maintenance of life within a nature that is originally andultimately inorganic. The assimilation of the field of biology and physiology to the mechanical cosmos had made little real progress prior to the nineteenth century. Mechanical theories had, indeed, been projected in the earliest age of philosophy, and proposed anew in the seventeenth century.[245:14]Nevertheless, the structural and functional teleology of the organism remained as apparently irrefutable testimony to the inworking of some principle other than that of mechanical necessity. Indeed, the only fruitful method applicable to organic phenomena was that which explained them in terms of purposive adaptation. And it was its provision for a mechanical interpretation of this very principle that gave to the Darwinianlaw of natural selection, promulgated in 1859 in the "Origin of Species," so profound a significance for naturalism. It threatened to reduce the last stronghold of teleology, and completely to dispense with the intelligent Author of nature.

Darwin's hypothesis sought to explain the origin of animal species by survival under competitive conditions of existence through the possession of a structure suited to the environment. Only themost elementary organism need be presupposed, together with slight variations in the course of subsequent generations, and both may be conceived to arise mechanically. There will then result in surviving organisms a gradual accumulation of such variations as promote survival under the special conditions of the environment. Such a principle had been suggested as early as the time of Empedocles, but it remained for Darwin to establish it with an unanswerable array of observation and experimentation. If any organism whatsoever endowed with the power of generation be allowed to have somehow come to be, naturalism now promises to account for the whole subsequent history of organic phenomena and the origin of any known species.

Mechanical Physiology.

§113. But what of life itself? The question of the derivation of organic from inorganic matter has proved insoluble by direct means, and the case of naturalism must here rest upon such facts as the chemical homogeneity of these two kinds of matter, and the conformity of physiological processes to more general physical laws. Organic matter differs from inorganic only through the presence of proteid, a peculiar product of known elements, which cannot be artificiallyproduced, but which is by natural means perpetually dissolved into these elements without any discoverable residuum. Respiration may be studied as a case of aerodynamics, the circulation of the blood as a case of hydrodynamics, and the heat given off in the course of work done by the body as a case of thermodynamics. And although vitalistic theories still retain a place in physiology, as do teleological theories in biology, on the whole the naturalistic programme of a reduction of organic processes to the type of the inorganic tends to prevail.

Mind. The Reduction to Sensation.

§114. The history of naturalism shows that, as in the case of life, so also in the case ofmind, its hypotheses were projected by the Greeks, but precisely formulated and verified only in the modern period of science. In the philosophy of Democritus the soul was itself an atom, finer, rounder, and smoother than the ordinary, but thoroughly a part of the mechanism of nature. The processes of the soul are construed as interactions between the soul and surrounding objects. In sensation, the thing perceived produces images by means of effluxes which impinge upon the soul-atom. These images are not true reports of the outer world, but must be revised bythought before its real atomic structure emerges. For this higher critical exercise of thought Democritus devised no special atomic genesis. The result may be expressed either as the invalidity of such operations of mind as he could provide for in his universe, or the irreducibility to his chosen first principles of the very thought which defined them. Later naturalism has generally sacrificed epistemology to cosmology, and reduced thought to sensation. Similarly, will has been regarded as a highly developed case of instinct. Knowledge and will, construed as sensation and instinct, may thus be interpreted in the naturalistic manner within the field of biology.

Automatism.

§115. But the actual content of sensation, and the actual feelings which attend upon the promptings of instinct, still stubbornly testify to the presence in the universe of something belonging to a wholly different category from matter and motion. The attitude of naturalism in this crucial issue has never been fixed and unwavering, but there has gradually come to predominate a method of denying to the inner life all efficacy and real significance in the cosmos, while admitting its presence on the scene. It is a strange fact of history that Descartes, the French philosopher whoprided himself on having rid the soul of all dependence on nature, should have greatly contributed to this method. But it is perhaps not so strange when we consider that every dualism is, after all, symmetrical, and that consequently whatever rids the soul of nature at the same time rids nature of the soul. It was Descartes who first conceived the body and soul to be utterly distinct substances. The corollary to this doctrine was hisautomatism, applied in his own system to animals other than man, but which those less concerned with religious tradition and less firmly convinced of the soul's originating activity were not slow to apply universally. This theory conceived the vital processes to take place quite regardless of any inner consciousness, or even without its attendance. To this radical theory the French materialists of the eighteenth century were especially attracted. With them the active soul of Descartes, the distinct spiritual entity, disappeared. This latter author had himself admitted a department of the self, which he called the "passions," in which the course and content of mind is determined by bodily conditions. Extending this conception to the whole province of mind, they employed it to demonstrate the thorough-going subordination of mindto body. La Mettrie, a physician and the author of a book entitled "L'Homme Machine," was first interested in this thesis by a fever delirium, and afterward adduced anatomical and pathological data in support of it. The angle from which he views human life is well illustrated in the following:

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