FOOTNOTES:

The steam-hammer, in the early stages of its invention, required an attendant to turn on the steam again at the end of each stroke, but Mr. Nasmyth ingeniously contrived the means of rendering the engine altogether self-acting, by causing the force of the collision to release a spring that holds down the slide-valve; and by this contrivance a continued and regular succession of blows is maintained without any assistance.

Not only can the force of the blow be regulated by the height to which the hammer is lifted, but the ponderous mass may be arrested in its descent by admitting the steam under the piston, so that a skilful manipulator can stop it within the eighth of an inch from the anvil.

The Steam Engine itself, by which all the self-acting mechanisms of a large factory are put in motion, is, perhaps, after all, the most wonderful of inventions; but it does not strictly come within our province, for Watt had perfected his great work before the close of the last century. It was, however, not much used, excepting for mining purposes, until after the commencement of the present; and the inventor himself had but a faint idea of the value and vast importance of the motive power he had placed at the command of man. So little, indeed, was the value of steam power appreciated in the early years of its application,that no notice is taken of the steam engine in Beckmann's History of Inventions, though Watt had completed his condensing engines several years before that work was published; and Newcomen's steam engine had been at work at least sixty years.

The history of the steam engine affords a striking example of the gradual development of an invention from vague and chimerical notions, into an accomplished fact of astonishing magnitude. As in the electric telegraph the dreams of the alchemist are fully realized by the applications of scientific discovery, so in the wonder-working powers of the steam engine one of the visionary schemes sketched in the "Century of Inventions" is practically extended far beyond the conceptions of its fanciful projector. How little could Beckmann have supposed that an invention, which he considered too insignificant to be mentioned, would, in the course of fifty years, have revolutionized the world! It may possibly be the same, before this century is closed, with inventions that are now neglected or despised.

*****

The record in the preceding pages of some of the most remarkable applications of science during the present century, exhibits an amount of intelligence, of skill, and of power that seems, when viewed in its completed form, to be superhuman. It is only by tracing each invention to its source, and by noting thestep by step advances by which it has arrived at its present state, that we can bring ourselves to believe that the great development of power and the display of ingenuity we witness, can have been accomplished by ordinary men. This feeling of admiration, at the results of human industry and inventive genius, was strongly excited on passing through the wonderful collection of the works of all nations in the Great Exhibition of 1851. After walking through the long avenues, crowded with the most highly finished manufactured goods, and with works of art, adapted to every purpose and capable of gratifying every luxurious taste of highly civilized life, we beheld, in another part of the building, the self-acting machines by which many of those productions had been manufactured. We saw various mechanisms, moving without hands to guide them, producing the most elaborate works; massive steam engines,—the representatives of man's power,—and exquisite contrivances, displaying his ingenuity and perseverance; and we felt inclined to exalt the attributes of humanity, and to think that nothing could surpass the productions there displayed. But as if to repress such vainglorious thoughts, there stood in the transept of the building, surrounded by and contrasting with the handiworks of man, one of the simplest productions of Nature. Every single leaf on the spreading branches of that magnificent tree exhibited in its structure, in its self-supporting and self-acting mechanism, and in the adaptation of surrounding circumstances for its maintenance, an amount of intelligent design and contrivanceand power, with which there was nothing to compare. After examining the intricate ramifications of arteries and veins for spreading the sap throughout the leaf, and the innumerable pores for inhaling and exuding the gases and moisture necessary for its continued existence; after carrying the mind beyond the beautiful structure itself, to consider the provisions of heat and moisture and air, without which all that mechanism would have been useless; and having reflected on the presence of the mysterious principle which actuated the whole arrangement of fibres, and gave life to the crude elements of matter,—we could not fail to be impressed with the insignificance of the most elaborate productions of man, when compared with the smallest work of the Omnipotent Creator.

THE END.

FOOTNOTES:1British Association Report for 1853.2The original photographs produced by M. Niepce are still preserved in good condition, and were last year exhibited at the Royal Institution.3"Philosophical Magazine," February, 1843.4Brewster's Encyclopædia, article "Kaleidoscope."5"The Stereoscope: its History, Theory, and Construction," by Sir David Brewster.6Primary signals are those in which the letter indicated is represented by a single deflection of the needles in either direction. A single needle telegraph can have only two primary signals, one to the right and one to the left; all the other letters being indicated by repeated deflections. In several instances four deflections are required to signal a single letter.7"Manual of Electricity," p. 251; and Reports of the Proceedings of the British Association for 1851 and 1854.8"Manual of Electricity," second edition, p. 247.9"Treatise on Coal Gas," by Samuel Clegg, jun.10See article, "Steam Carriages," page 35.11It is stated in Mr. Clegg's "Treatise on Coal Gas," that Mr. Clegg, sen., lighted the cotton mill of Mr. Henry Lodge, at Sowerby Bridge, near Halifax, a fortnight before the mill of Messrs. Phillips and Lee was so lighted. A friendly spirit of emulation is said to have existed between Mr. Murdoch and Mr. Clegg in lighting those two mills with gas, each one endeavouring to complete the work before the other.12The facility with which a supply of carburretted hydrogen gas can be obtained from gas works, induces aeronauts to fill their balloons with it rather than be at the trouble and expense of making hydrogen for the purpose; but the ascending power of the balloon is thereby greatly diminished.13Journal of Gas Lighting, vol. ii.14Mr. Hearder, of Plymouth, affords a remarkable instance of the successful pursuit of science under difficulties. He lost his sight in his youth by an accidental explosion during some chemical experiments, but instead of being disheartened by that calamity, he has continued to pursue his investigations with unabated vigour, and has succeeded in throwing much light on many of the recondite properties of electricity, by admirably contrived experiments, which were conducted with unremitting perseverance at great expense. He has been in the habit of delivering lectures at the Plymouth Institution, and other Institutions in Devon and Cornwall; and those who witness the skilful manipulation of his experiments can scarcely suppose that he is blind.15This statement does not adequately represent the reduction in price; for each volume, sold at 5s., contained a volume and a half as originally published, besides Sir Walter Scott's notes; and the cheap volumes were illustrated with steel engravings.16If the number of sheets of paper used in printing these works were laid side by side, they would extend nearlyfifty thousand miles!17"L'Art de la Lithographie;" par M. Aloys Senefelder, Inventeur de l'Art Lithographique. Munich, 1859.18Book of Ecclesiastes i. 10.

1British Association Report for 1853.

2The original photographs produced by M. Niepce are still preserved in good condition, and were last year exhibited at the Royal Institution.

3"Philosophical Magazine," February, 1843.

4Brewster's Encyclopædia, article "Kaleidoscope."

5"The Stereoscope: its History, Theory, and Construction," by Sir David Brewster.

6Primary signals are those in which the letter indicated is represented by a single deflection of the needles in either direction. A single needle telegraph can have only two primary signals, one to the right and one to the left; all the other letters being indicated by repeated deflections. In several instances four deflections are required to signal a single letter.

7"Manual of Electricity," p. 251; and Reports of the Proceedings of the British Association for 1851 and 1854.

8"Manual of Electricity," second edition, p. 247.

9"Treatise on Coal Gas," by Samuel Clegg, jun.

10See article, "Steam Carriages," page 35.

11It is stated in Mr. Clegg's "Treatise on Coal Gas," that Mr. Clegg, sen., lighted the cotton mill of Mr. Henry Lodge, at Sowerby Bridge, near Halifax, a fortnight before the mill of Messrs. Phillips and Lee was so lighted. A friendly spirit of emulation is said to have existed between Mr. Murdoch and Mr. Clegg in lighting those two mills with gas, each one endeavouring to complete the work before the other.

12The facility with which a supply of carburretted hydrogen gas can be obtained from gas works, induces aeronauts to fill their balloons with it rather than be at the trouble and expense of making hydrogen for the purpose; but the ascending power of the balloon is thereby greatly diminished.

13Journal of Gas Lighting, vol. ii.

14Mr. Hearder, of Plymouth, affords a remarkable instance of the successful pursuit of science under difficulties. He lost his sight in his youth by an accidental explosion during some chemical experiments, but instead of being disheartened by that calamity, he has continued to pursue his investigations with unabated vigour, and has succeeded in throwing much light on many of the recondite properties of electricity, by admirably contrived experiments, which were conducted with unremitting perseverance at great expense. He has been in the habit of delivering lectures at the Plymouth Institution, and other Institutions in Devon and Cornwall; and those who witness the skilful manipulation of his experiments can scarcely suppose that he is blind.

15This statement does not adequately represent the reduction in price; for each volume, sold at 5s., contained a volume and a half as originally published, besides Sir Walter Scott's notes; and the cheap volumes were illustrated with steel engravings.

16If the number of sheets of paper used in printing these works were laid side by side, they would extend nearlyfifty thousand miles!

17"L'Art de la Lithographie;" par M. Aloys Senefelder, Inventeur de l'Art Lithographique. Munich, 1859.

18Book of Ecclesiastes i. 10.

Works on Chemistry.Class-book of Chemistry.BY E. L. YOUMANS.12mo. 340 pages. Price 75 cents.Every page of this book bears evidence of the author's superior ability of perfectly conforming his style to the capacity of youth. This is a merit rarely possessed by the authors of scientific school-books, and will be appreciated by every discriminating teacher. While Chemistry is almost universally regarded by students as a dry and repulsive study (owing to the rigid and technical manner in which it is presented), Mr. Youmans' work will be found pre-eminent in clearness and simplicity of diction, by which the subject is made at once interesting and attractive. It is especially commended by the eminently practical manner in which each subject is presented. Its illustrations are drawn largely from the phenomena of daily experience, and the interest of the pupil is speedily awakened by the consideration that Chemistry is not a matter belonging exclusively to physicians and professors.FromProf. Wm. H. Bigelow.The eminently practical character of the Class-book, treating of the familiar applications of the science, is, in my opinion, its chief excellence, and gives it a value far superior to any other work now before the public.FromDavid Syme, A. M.,formerly Principal of the Math. Dept. and Lecturer in Nat. Philosophy, Chemistry, and Physiology, in Columbia College.Mr. Youmans: Dear Sir,—I have carefully examined your Class-Book on Chemistry, and, in my opinion, it is better adapted for use in schools and academies than any other work on the subject that has fallen under my observation.I hope that the success of your Class-Book will be proportionate to its merits, and that your efforts to diffuse the knowledge of Chemistry will be duly appreciated by the friends of education.FromProf. J. Mulligan,Principal of Young Ladies' School, New York.We have a large number of school-books for the purpose of giving elementary instruction in Chemistry—possessing various kinds and various degrees of merit; but of all which I have examined, I should prefer the Class-Book of Chemistry, as the most perspicuous in style and method, and as containing the happiest selection of what is most interesting, and most practically valuable in the vast field of chemical science.From the N. Y. Commercial Advertiser.Either for schools or for general reading, we know of no elementary work on Chemistry which in every respect pleases us so much as this.From the Scientific American.Such a book, in the present state of chemical science, was demanded; but to present the subject in such a clear, comprehensive manner, in a work of the size before us, is more than we expected.The author has happily succeeded in clothing his ideas in plain language—true eloquence—so as to render the subject both interesting and easily comprehended. The number of men who can write on science and write clearly, is small; but our author is among that number.Chemical Chart:BY E. L. YOUMANS.On Rollers, 5 feet by 6 in size. New Edition. Price $5.This popular work accomplishes for the first time, for Chemistry, what maps and charts have for geography, geology, and astronomy, by presenting a new and valuable mode of illustration. Its plan is to represent chemical composition to the eye by colored diagrams, so that numerous facts of proportion, structure, and relation, which are the most difficult in the science, are presented to the mind through the medium of the eye, and may thus be easily acquired and long retained. The want of such a chart has long been felt by the thoughtful teacher, and no other scientific publication that has ever emanated from the American press has met with the universal favor that has been accorded to this Chart. In the language of a distinguished chemist, "Its appearance marks an era in the progress of the popularization of Chemistry."It illustrates the nature of elements, compounds, affinity, definite and multiple proportions, acids, bases, salts, the salt-radical theory, double decomposition, deoxidation, combustion and illumination, isomerism, compound radicals, and the composition of the proximate principles of food. It covers the whole field of Agricultural Chemistry, and is invaluable as an aid to public lecturers, to teachers in class-room recitation, and for reference in the family. The mode of using it is explained in the class-book.From the lateHorace Mann,President of Antioch College.I think Mr. Youmans is entitled to great credit for the preparation of his Chart, because its use will not only facilitate acquisition, but, what is of far greater importance, will increase the exactness and precision of the student's elementary ideas.FromDr. John W. Draper,Professor of Chemistry in the University of N. Y.Mr. Youmans' Chart seems to me well adapted to communicate to beginners a knowledge of the definite combinations of chemical substances, and as a preliminary to the use of symbols, to aid them very much in the recollection of the examples it contains. It deserves to be introduced into the schools.FromJames B. Rogers,Professor of Chemistry in the University of Pennsylvania.We cordially subscribe to the opinion of Professor Draper concerning the value to beginners of Mr. Youmans' Chemical Chart.JOHN TORREY,Professor of Chemistry in the College of Physicians & Surgeons, N. Y.WM. H. ELLET,Late Professor of Chemistry in Columbia College, S. C.JAMES B. ROGERS,Professor of Chemistry in the University of Pennsylvania.FromBenjamin Silliman, LL. D.,Professor of Chemistry in Yale College.I have hastily examined Mr. Youmans' New Chemical Diagrams or Chart of chemical combinations by the union of the elements in atomic proportions. The design appears to be an excellent one.History of Philosophy.A History of Philosophy:AN EPITOME.BY DR. ALBERT SCHWEGLER.TRANSLATED FROM THE ORIGINAL GERMAN, BY JULIUS H. SEELYE.12mo. 365 pages. Price $1 25.This translation is designed to supply a want long felt by both teachers and students in our American colleges. We have valuable histories of Philosophy in English, but nomanualon this subject so clear, concise, and comprehensive as the one now presented. Schwegler's work bears the marks of great learning, and is evidently written by one who has not only studied the original sources for such a history, but has thought out for himself the systems of which he treats. He has thus seized upon the real germ of each system, and traced its process of development with great clearness and accuracy. The whole history of speculation, from Thales to the present time, is presented in its consecutive order. This rich and important field of study, hitherto so greatly neglected, will, it is hoped, receive a new impulse among American students through Mr. Seelye's translation. It is a book, moreover, invaluable for reference, and should be in the possession of every public and private library.FromL. P. Hickok,Vice-President of Union College."I have had opportunity to hear a large part of Rev. Mr. Seelye's translation of Schwegler's History of Philosophy read from manuscript, and I do not hesitate to say that it is a faithful, clear, and remarkably precise English rendering of this invaluable Epitome of the History of Philosophy. It is exceedingly desirable that it should be given to American students of philosophy in the English language, and I have no expectation of its more favorable and successful accomplishment than in this present attempt. I should immediately introduce it as a text-book in the graduate's department under my own instruction, if it be favorably published, and cannot doubt that other teachers will rejoice to avail themselves of the like assistance from it."FromHenry B. Smith,Professor of Christian Theology, Union Theological Seminary, N. Y."It will well reward diligent study, and is one of the best works for a text-book in our colleges upon this neglected branch of scientific investigation."FromN. Porter,Professor of Intellectual Philosophy in Yale College."It is the only book translated from the German which professes to give an account of the recent German systems which seems adapted to give any intelligible information on the subject to a novice."FromGeo. P. Fisher,Professor of Divinity in Yale College."It is really the best Epitome of the History of Philosophy now accessible to the English student."FromJoseph Haven,Professor of Mental Philosophy in Amherst College."As a manual and brief summary of the whole range of speculative inquiry, I know of no work which strikes me more favorably."Moral Philosophy.Elements of Moral Philosophy:ANALYTICAL, SYNTHETICAL, AND PRACTICAL.BY HUBBARD WINSLOW.12mo. 480 pages. Price $1 25.This work is an original and thorough examination of the fundamental laws of Moral Science, and of their relations to Christianity and to practical life. It has already taken a firm stand among our highest works of literature and science. From the numerous commendations of it by our most learned and competent men, we have room for only the following brief extracts:From theRev. Thomas H. Skinner, D. D.,of the Union Theol. Sem., N. Y."It is a work of uncommon merit, on a subject very difficult to be treated well. His analysis is complete. He has shunned no question which his purpose required him to answer, and he has met no adversary which he has not overcome."FromRev. L. P. Hickok,Vice-President of Union College."I deem the book well adapted to the ends proposed in the preface. The style is clear, the thoughts perspicuous. I think it calculated to do good, to promote the truth, to diffuse light, and impart instruction to the community, in a department of study of the deepest interest to mankind."FromRev. James Walker, D. D.,President of Harvard University."Having carefully examined the more critical parts, to which my attention has been especially directed, I am free to express my conviction of the great clearness, discrimination, and accuracy of the work, and of its admirable adaptation to its object."FromRev. Ray Palmer, D. D.,of Albany."I have examined this work with great pleasure, and do not hesitate to say that in my judgment it is greatly superior to any treatise I have seen, in all the essential requisites of a good text-book."FromProf. Rousseau D. Hitchcock, D. D.,of Union Theol. Sem., N. Y."The task of mediating between science and the popular mind, is one that requires a peculiar gift of perspicuity, both in thought and style; and this, I think, the author possesses in an eminent degree. I am pleased with its comprehensiveness, its plainness, and its fidelity to the Christian stand-point."FromProf. Henry B. Smith, D. D.,of the Union Theol. Sem., N. Y."It commends itself by its clear arrangement of the topics, its perspicuity of language, and its constant practical bearings. I am particularly pleased with its views of conscience. Its frequent and pertinent illustrations, and the Scriptural character of its explanations of the particular duties, will make the work both attractive and valuable as a text-book, in imparting instruction upon this vital part of philosophy."FromW. D. Wilson, D. D.,Professor of Intellectual and Moral Philosophy in Hobart Free College."I have examined the work with care, and have adopted it as a text-book in the study of Moral Science. I consider it not only sound in doctrine, but clear and systematic in method, and withal pervaded with a prevailing healthy tone of sentiment, which cannot fail to leave behind, in addition to the truths it inculcates, an impression in favor of those truths. I esteem this one of the greatest merits of the book. In this respect it has no equal, so far as I know; and I do not hesitate to speak of it as being preferable to any other work yet published, for use in all institutions where Moral Philosophy forms a department in the course of instruction."

BY E. L. YOUMANS.

12mo. 340 pages. Price 75 cents.

Every page of this book bears evidence of the author's superior ability of perfectly conforming his style to the capacity of youth. This is a merit rarely possessed by the authors of scientific school-books, and will be appreciated by every discriminating teacher. While Chemistry is almost universally regarded by students as a dry and repulsive study (owing to the rigid and technical manner in which it is presented), Mr. Youmans' work will be found pre-eminent in clearness and simplicity of diction, by which the subject is made at once interesting and attractive. It is especially commended by the eminently practical manner in which each subject is presented. Its illustrations are drawn largely from the phenomena of daily experience, and the interest of the pupil is speedily awakened by the consideration that Chemistry is not a matter belonging exclusively to physicians and professors.

FromProf. Wm. H. Bigelow.

The eminently practical character of the Class-book, treating of the familiar applications of the science, is, in my opinion, its chief excellence, and gives it a value far superior to any other work now before the public.

FromDavid Syme, A. M.,formerly Principal of the Math. Dept. and Lecturer in Nat. Philosophy, Chemistry, and Physiology, in Columbia College.

Mr. Youmans: Dear Sir,—I have carefully examined your Class-Book on Chemistry, and, in my opinion, it is better adapted for use in schools and academies than any other work on the subject that has fallen under my observation.I hope that the success of your Class-Book will be proportionate to its merits, and that your efforts to diffuse the knowledge of Chemistry will be duly appreciated by the friends of education.

I hope that the success of your Class-Book will be proportionate to its merits, and that your efforts to diffuse the knowledge of Chemistry will be duly appreciated by the friends of education.

FromProf. J. Mulligan,Principal of Young Ladies' School, New York.

We have a large number of school-books for the purpose of giving elementary instruction in Chemistry—possessing various kinds and various degrees of merit; but of all which I have examined, I should prefer the Class-Book of Chemistry, as the most perspicuous in style and method, and as containing the happiest selection of what is most interesting, and most practically valuable in the vast field of chemical science.

From the N. Y. Commercial Advertiser.

Either for schools or for general reading, we know of no elementary work on Chemistry which in every respect pleases us so much as this.

From the Scientific American.

Such a book, in the present state of chemical science, was demanded; but to present the subject in such a clear, comprehensive manner, in a work of the size before us, is more than we expected.The author has happily succeeded in clothing his ideas in plain language—true eloquence—so as to render the subject both interesting and easily comprehended. The number of men who can write on science and write clearly, is small; but our author is among that number.

Such a book, in the present state of chemical science, was demanded; but to present the subject in such a clear, comprehensive manner, in a work of the size before us, is more than we expected.

The author has happily succeeded in clothing his ideas in plain language—true eloquence—so as to render the subject both interesting and easily comprehended. The number of men who can write on science and write clearly, is small; but our author is among that number.

BY E. L. YOUMANS.

On Rollers, 5 feet by 6 in size. New Edition. Price $5.

This popular work accomplishes for the first time, for Chemistry, what maps and charts have for geography, geology, and astronomy, by presenting a new and valuable mode of illustration. Its plan is to represent chemical composition to the eye by colored diagrams, so that numerous facts of proportion, structure, and relation, which are the most difficult in the science, are presented to the mind through the medium of the eye, and may thus be easily acquired and long retained. The want of such a chart has long been felt by the thoughtful teacher, and no other scientific publication that has ever emanated from the American press has met with the universal favor that has been accorded to this Chart. In the language of a distinguished chemist, "Its appearance marks an era in the progress of the popularization of Chemistry."

It illustrates the nature of elements, compounds, affinity, definite and multiple proportions, acids, bases, salts, the salt-radical theory, double decomposition, deoxidation, combustion and illumination, isomerism, compound radicals, and the composition of the proximate principles of food. It covers the whole field of Agricultural Chemistry, and is invaluable as an aid to public lecturers, to teachers in class-room recitation, and for reference in the family. The mode of using it is explained in the class-book.

From the lateHorace Mann,President of Antioch College.

I think Mr. Youmans is entitled to great credit for the preparation of his Chart, because its use will not only facilitate acquisition, but, what is of far greater importance, will increase the exactness and precision of the student's elementary ideas.

FromDr. John W. Draper,Professor of Chemistry in the University of N. Y.

Mr. Youmans' Chart seems to me well adapted to communicate to beginners a knowledge of the definite combinations of chemical substances, and as a preliminary to the use of symbols, to aid them very much in the recollection of the examples it contains. It deserves to be introduced into the schools.

FromJames B. Rogers,Professor of Chemistry in the University of Pennsylvania.

We cordially subscribe to the opinion of Professor Draper concerning the value to beginners of Mr. Youmans' Chemical Chart.JOHN TORREY,Professor of Chemistry in the College of Physicians & Surgeons, N. Y.WM. H. ELLET,Late Professor of Chemistry in Columbia College, S. C.JAMES B. ROGERS,Professor of Chemistry in the University of Pennsylvania.

We cordially subscribe to the opinion of Professor Draper concerning the value to beginners of Mr. Youmans' Chemical Chart.

JOHN TORREY,Professor of Chemistry in the College of Physicians & Surgeons, N. Y.

WM. H. ELLET,Late Professor of Chemistry in Columbia College, S. C.

JAMES B. ROGERS,Professor of Chemistry in the University of Pennsylvania.

FromBenjamin Silliman, LL. D.,Professor of Chemistry in Yale College.

I have hastily examined Mr. Youmans' New Chemical Diagrams or Chart of chemical combinations by the union of the elements in atomic proportions. The design appears to be an excellent one.

BY DR. ALBERT SCHWEGLER.

TRANSLATED FROM THE ORIGINAL GERMAN, BY JULIUS H. SEELYE.

12mo. 365 pages. Price $1 25.

This translation is designed to supply a want long felt by both teachers and students in our American colleges. We have valuable histories of Philosophy in English, but nomanualon this subject so clear, concise, and comprehensive as the one now presented. Schwegler's work bears the marks of great learning, and is evidently written by one who has not only studied the original sources for such a history, but has thought out for himself the systems of which he treats. He has thus seized upon the real germ of each system, and traced its process of development with great clearness and accuracy. The whole history of speculation, from Thales to the present time, is presented in its consecutive order. This rich and important field of study, hitherto so greatly neglected, will, it is hoped, receive a new impulse among American students through Mr. Seelye's translation. It is a book, moreover, invaluable for reference, and should be in the possession of every public and private library.

FromL. P. Hickok,Vice-President of Union College.

"I have had opportunity to hear a large part of Rev. Mr. Seelye's translation of Schwegler's History of Philosophy read from manuscript, and I do not hesitate to say that it is a faithful, clear, and remarkably precise English rendering of this invaluable Epitome of the History of Philosophy. It is exceedingly desirable that it should be given to American students of philosophy in the English language, and I have no expectation of its more favorable and successful accomplishment than in this present attempt. I should immediately introduce it as a text-book in the graduate's department under my own instruction, if it be favorably published, and cannot doubt that other teachers will rejoice to avail themselves of the like assistance from it."

FromHenry B. Smith,Professor of Christian Theology, Union Theological Seminary, N. Y.

"It will well reward diligent study, and is one of the best works for a text-book in our colleges upon this neglected branch of scientific investigation."

FromN. Porter,Professor of Intellectual Philosophy in Yale College.

"It is the only book translated from the German which professes to give an account of the recent German systems which seems adapted to give any intelligible information on the subject to a novice."

FromGeo. P. Fisher,Professor of Divinity in Yale College.

"It is really the best Epitome of the History of Philosophy now accessible to the English student."

FromJoseph Haven,Professor of Mental Philosophy in Amherst College.

"As a manual and brief summary of the whole range of speculative inquiry, I know of no work which strikes me more favorably."

BY HUBBARD WINSLOW.

12mo. 480 pages. Price $1 25.

This work is an original and thorough examination of the fundamental laws of Moral Science, and of their relations to Christianity and to practical life. It has already taken a firm stand among our highest works of literature and science. From the numerous commendations of it by our most learned and competent men, we have room for only the following brief extracts:

From theRev. Thomas H. Skinner, D. D.,of the Union Theol. Sem., N. Y.

"It is a work of uncommon merit, on a subject very difficult to be treated well. His analysis is complete. He has shunned no question which his purpose required him to answer, and he has met no adversary which he has not overcome."

FromRev. L. P. Hickok,Vice-President of Union College.

"I deem the book well adapted to the ends proposed in the preface. The style is clear, the thoughts perspicuous. I think it calculated to do good, to promote the truth, to diffuse light, and impart instruction to the community, in a department of study of the deepest interest to mankind."

FromRev. James Walker, D. D.,President of Harvard University.

"Having carefully examined the more critical parts, to which my attention has been especially directed, I am free to express my conviction of the great clearness, discrimination, and accuracy of the work, and of its admirable adaptation to its object."

FromRev. Ray Palmer, D. D.,of Albany.

"I have examined this work with great pleasure, and do not hesitate to say that in my judgment it is greatly superior to any treatise I have seen, in all the essential requisites of a good text-book."

FromProf. Rousseau D. Hitchcock, D. D.,of Union Theol. Sem., N. Y.

"The task of mediating between science and the popular mind, is one that requires a peculiar gift of perspicuity, both in thought and style; and this, I think, the author possesses in an eminent degree. I am pleased with its comprehensiveness, its plainness, and its fidelity to the Christian stand-point."

FromProf. Henry B. Smith, D. D.,of the Union Theol. Sem., N. Y.

"It commends itself by its clear arrangement of the topics, its perspicuity of language, and its constant practical bearings. I am particularly pleased with its views of conscience. Its frequent and pertinent illustrations, and the Scriptural character of its explanations of the particular duties, will make the work both attractive and valuable as a text-book, in imparting instruction upon this vital part of philosophy."

FromW. D. Wilson, D. D.,Professor of Intellectual and Moral Philosophy in Hobart Free College.

"I have examined the work with care, and have adopted it as a text-book in the study of Moral Science. I consider it not only sound in doctrine, but clear and systematic in method, and withal pervaded with a prevailing healthy tone of sentiment, which cannot fail to leave behind, in addition to the truths it inculcates, an impression in favor of those truths. I esteem this one of the greatest merits of the book. In this respect it has no equal, so far as I know; and I do not hesitate to speak of it as being preferable to any other work yet published, for use in all institutions where Moral Philosophy forms a department in the course of instruction."

Transcribers' Notes:Punctuation and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.Simple typographical errors were corrected; occasional unbalanced quotation marks retained.Ambiguous hyphens at the ends of lines were retained.This text spells "gauge" as "guage" in all but one instance; none changed here.Page34: "by a break put on" perhaps should be "brake".Page40: "conveyed upwards fourteen" probably should be "conveyed upwards of fourteen".Page70: "the prepare surfaced" probably is a misprint for "surface".Page83: "re-agents" was printed that way.Page197: "distil" was printed that way.Page208: "metropolitian" was printed that way.

Punctuation and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.

Simple typographical errors were corrected; occasional unbalanced quotation marks retained.

Ambiguous hyphens at the ends of lines were retained.

This text spells "gauge" as "guage" in all but one instance; none changed here.

Page34: "by a break put on" perhaps should be "brake".

Page40: "conveyed upwards fourteen" probably should be "conveyed upwards of fourteen".

Page70: "the prepare surfaced" probably is a misprint for "surface".

Page83: "re-agents" was printed that way.

Page197: "distil" was printed that way.

Page208: "metropolitian" was printed that way.

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