Works of Herbert Spencer published by D. Appleton & Co.

A NEW SYSTEM OF PHILOSOPHY,

FIRST PRINCIPLES.

A Vol. Large 12mo. 515 Pages. Price $2 50.

CONTENTS:

PART FIRST.-The Unknowable.

Juapter 1. Religion and Science; II. Ultimate Religious Ideas; IIL Ultimate Scientific Ideas; IV. The Relativity of all Knowledge; V The Reconciliation.

PART SECOND Laws of the Knowable.

I. Laws in General; II. The Law of Evolution; III. The same continued; IV. The Causes of Evolution; V. Space, Time, Matter, Motion, and Force; VI. The Indestructibility of Matter; VII. The Continuity of Motion; VIII. The Persistence of Force; IX. The Correlation and Equivalence of Forces; X. The Direction of Motion; XI. The Rhythm of Motion; XII. The Conditions Essential to Evolution; XIII. The Instability of the Homoge neous; XIV. The Multiplication of Effects; XV. Differentiation and Inte gration; XVI. Equilibration; XVII. Summary and Conclusion.

In the first part of this work Mr. Spencer defines the province, limits, and relations of religion and science, and determines the legitimate scope of philosophy.

In part second he unfolds those fundamental principles which have been arrived at within the sphere of the knowable; which are true of all orders of phenonema, and thus constitute the foundation of all philosophy. The law of Evolution, Mr. Spencer maintains to be universal, and he has here worked it out as the basis of his system.

These First Principles are the foundation of a system of Philosophy bolder, more elaborate, and comprehensive perhaps, than any other which nat been hitherto designed in England.-British Quarterly Review.

A work lofty in aim and remarkable in execution-Cornhill Mayazinc. In the works of Herbert Spencer we have the rudiments of a positive Theology, and an immense step toward the perfection of the science of Paychology. Christian Examiner.

If we mistake not, in spite of the very negative character of his own re lts, he has foreshadowed some strong arguments for the doctrine of a pozi. ve Christian Theology.-New Englander.

As far as the frontiers of knowledge, where the intellect may go, there a 20 living man whose guidance may more safely be trusted. Atlantis Monthly.

THE CONDITIONS ESSENTIAL TO HUMAN HAPPINESS SPECIFIED, AND THE FIRST OF THEM

DEVELOPED.

In one Volume. Large 12mo.

All these works are rich in materials for forming intelligent opinions, even where we are unable to agree with those put forth by the author. Much may be learned from them in departments in which our common Educational system is very deficient. The active citizen may derive from them accurate systematized information concerning his highest duties to society, and the principles on which they are based. He may gain slearer notions of the value and bearing of evidence, and be better able to distinguish between facts and inferences. He may find common things suggestive of wiser thought -nay, we will venture to say of truer emotion-than before. By giving us fuller realizations of liberty and justice his writings will tend to increase our self-reliance in the great emergency of civilization to which we have been summoned.-Atlantic Monthly

ILLUSTRATIONS OF UNIVERSAL PROGRESS.

A SERIES OF DISCUSSIONS.

1 Vol Large 12mo. 470 Pages. Price $2.50.

CONTENTS:

American Notice of Spencer's New System of Philosophy.
I Progress: its Law and Cause.

These Essays constitute a body of massive and original thought upon a large variety of important topics, and will be read with pleasure by all who appreciate a bold and powerful treatment of fundamental themes. The general thought which pervades this book is beyond doubt the most impor tant that the human mind has yet reached.-N. Y. Independent.

Those who have read the work on Education, will remember the ana lytic tendency of the author's mind—his clear perception and admirable exposition of úrst principles-his wide grasp of facts-his lucid and vigorous style, and the constant and controlling bearing of the discussion on practica) results. These traits characterize all Mr. Spencer's writings, and mark, in an eminent degree, the present volume.-N. Y. Tribune.

We regard the distinguishing feature of this work to be the peculiarly Interesting character of its matter to the general reader. This is a great literary as well as philosophic triumph. In the evolution of a system of Philosophy which demands serious attention, and a keen exercise of the intellect to fathom and appreciate, he has mingled much that is really popular and entertaining.-Rochester Democrat.

Works of Herbert Spencer published by D. Appleton & Co.

The Philosophy of Herbert Spencer.

THE

PRINCIPLES OF BIOLOGY

Vol. I. 475 pages. (Now in press.)

CONTENTS:

PART I.-THE DATA OF BIOLOGY.

I Organic Matter.-II. The actions of Forces on Organic Matter.-III. The re-actions of Organic Matter on Forces.--IV. Proximate Definition of Life.-V. The Correspondence between Life and its Circumstances.— VI. The Degree of Life varies as the Degree of Correspondence.VII. The Scope of Biology.

PART II.-THE INDUCTIONS OF BIOLOGY.

I. Growth.-II. Development.-III. Function.-IV. Waste and Repair.V. Adaptation.-VI. Individuality.-VII. Genesis.-VIII. Heredity.IX. Variation.-X. Genesis, Heredity, and Variation-XI. Classification.-XII. Distribution.

PART III.-THE EVOLUTION OF LIFE

I. Preliminary.—II. General Aspects of the Special-creation-hypothesis.— III. General Aspects of the Evolution-hypothesis.-IV. The Arguments from Classification.-V. The Arguments from Embryology.-VI. The Arguments from Morphology.-VII. The Arguments from Distribution. -VIII. How is Organic Evolution caused?-IX. External Factors.X. Internal Factors.-XI. Direct Equilibration.-XII. Indirect Equili bration.-XIII. The Coöperation of the Factors.-XIV. The Converg ence of the Evidences.

All these works are rich in materials for forming intelligent opinions, even where we are unable to agree with those put forth by the author. Much may be learned from .hem in departments in which our common Educational system is very deficient. The active citizen may derive from them accurate systematized information concerning his highest duties to society, and the principles on which they are based. He may gain clearer notions of the value and bearing of evidence, and be better able to distinguish between facts and inferences. He may find common things suggestive of wiser thought -nay, we will venture to say of truer emotion-than before. By giving us fuller realiations of liberty and justice his writings will tend to increase our self-reliance in the great emergency of civilization to which we have been summoned,— Atlantic Monthly

HEAT,

CONSIDERED AS A MODE OF MOTION,

Being a Course of Twelve Lectures delivered before the Royal Institution of Great Britain.

BY JOHN TYNDALL, F. R. S.,

FROFESSOR OF NATURAL PHILOSOPHY IN THE ROYAL INSTITUTION- AUTHOR OF 112 GLACIERS OF THE ALPS,” ETC.

With One Hundred Illustrations.

Svo, 480 pages. Price, $2.

From the American Journal of Science.-With all the skill which has made Faraday the master of experimental science in Great Britain, Professor Tyndall enjoys the advantage of a superior general culture, and is thus enabled to set forth his philosophy with all the graces of eloquence and the finish of superior diction. With a simplicity, and absence of technicalities, which render his explanations lucid to unscientific minds, and at the same time a thoroughness and originality by which he instructs the most learned, he unfolds all the modern philosophy of heat. His work takes rank at once as a classic upon the subject.

New York Times.-Professor Tyndall's course of lectures on heat is one of the most beautiful illustrations of a mode of handling scientific subjects, which is comparatively new, and which promises the best results, both to science and to literature generally; we mean the treatment of subjects in a style at once profound and popular. The title of Professor Tyndall's work indicates the theory of heat held by him, and indeed the only one now held by scientific men-it is a mode of motion.

Boston Journal.-He exhibits the curious and beautiful workings of nature in a most delightful manner. Before the reader particles of water lock themselves or fly asunder with a movement regulated like a dance. They form themselves into liquid flowers with fine serrated petals, or into rosettes of frozen gauze; they bound upward In boiling fountains, or creep slowly onward in stupendous glaciers. Flames burst into music and sing, or cease to sing, as the experimenter pleases, and metals paint themselves upon a screen in dazzling hues as the painter touches his canvas.

New York Tribune.-The most original and important contribution that has yet been made to the theory and literature of thermotics.

Scientific American.-The work is written in a charming style, and is the most valuable contribution to scientific literature that bas been published in many years. It is the most popular exposition of the dynamical theory of heat that has yet appeared. The old material theory of heat may be said to be defunct.

Louisville Democrat.-This is one of the most delightful scientific works we have ever met. The lectures are so full of life and spirit that we can almost imagine the lecturer before us, and see his brilliant experiments in every stage of their progress. The theory is so carefully and thoroughly explained that no one can fail to understand It. Such books as these create a love for science.

Independent.-Professor Tyndall's expositions and experiments are remarkably thoughtful, ingenious, clear, and convincing; portions of the book have almost the Interest of a romance, so startling are the descriptions and elucidations.