THE HE SYNTHETIC PHILOSOPHY OF HER- per volume. The titles of the several volumes are as follows. (1.) FIRST PRINCIPLES. I. The Unknowable. II. Laws of the Knowable. (2.) THE PRINCIPLES OF BIOLOGY. Vol. I. I. The Data of Biology. II. The Inductions of Biology. III. The Evolution of Life. (3.) THE PRINCIPLES OF BIOLOGY. Vol. II. IV. Morphological Development. V. Physiological Development. VI. Laws of Multiplication. (4.) THE PRINCIPLES OF PSYCHOLOGY. Vol. I. III. General Synthesis. V. Physical Synthesis. (5.) THE PRINCIPLES OF PSYCHOLOGY. Vol. II. VI. Special Analysis. VII. General Analysis. (6.) THE PRINCIPLES OF SOCIOLOGY. I. The Data of Sociology. VIII. Congruities. IX. Corollaries. Vol. I. II. The Inductions of Sociology. III. The Domestic Relations. (7.) THE PRINCIPLES OF SOCIOLOGY. IV. Ceremonial Institutions. (8.) THE PRINCIPLES OF SOCIOLOGY. VI. Ecclesiastical Institutions. VIII, Industrial Institutions. (9.) THE PRINCIPLES OF ETHICS. Vol. I. I. The Data of Ethics. II. The Inductions of Ethics. III. The Ethics of Individual Life. V. The Ethics of Social Life: Negative Beneficence. DESC ESCRIPTIVE SOCIOLOGY. A Cyclopædia of . $4 00 No. II. MEXICANS, CENTRAL AMERICANS, CHIBCHAS, and PE- 4 00 No. III. LOWEST RACES, NEGRITO RACES, and MALAYO-POLY- NEW EDITION OF PROF. HUXLEY'S ESSAYS. COLLECTED ESSAYS. BY THOMAS H. HUXLEY. VOL. VOL. VOL. VOL. New complete edition, with revisions, the Essays being grouped according to general subject. In nine volumes, a new Introduction accompanying each volume. 12mo. Cloth, $1.25 per volume. I.-METHOD AND RESULTS. II. DARWINIANA. III.-SCIENCE AND EDUCATION. IV. SCIENCE AND HEBREW TRADITION. VOL. V.-SCIENCE AND CHRISTIAN TRADITION. VOL. VII.-MAN'S PLACE IN NATURE. VOL. VIII.-DISCOURSES, BIOLOGICAL AND GEOLOGICAL. VOL. IX.-EVOLUTION AND ETHICS, AND OTHER ESSAYS. "Mr. Huxley has covered a vast variety of topics during the last quarter of a century. 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"It seems to be one of the most sensible and practical works on the subject that has come under notice."-Cleveland Plain Dealer. "A work that can be safely commended for its simplification of a subject that often puzzles others besides literary workers who are called upon to decide between conflicting theories as to punctuation."-Philadelphia Press. FRENCH STUMBLING-Blocks and eng LISH STEPPING-STONES. BY FRANCIS TARVER, M. A., late Senior French Master at Eton College. 12mo. Cloth, $1.00. "A most valuable book for advanced students of French as well as beginners. The book is one of the most useful of the many good books that appear on this subject."-San Francisco Bulletin. "One can hardly commend it too highly."-Boston Herald. "A work which will be of great help to the reader and student of French, and which fully meets the promise of its title."-Chicago Evening Post. DON'T; or, Directions for avoiding Improprieties in Conduct and Common Errors of Speech. By CENSOR. Parchment-Paper Edition, square 18m0, 30 cents. Vest-Pocket Edi tion, cloth, flexible, gilt edges, red lines, 30 cents. Boudoir Edition (with a new chapter designed for young people), cloth, gilt, 30 cents. 138th thousand. "Don't" deals with manners at the table, in the drawing room, and in public, with taste in dress, with personal habits, with common mistakes in various situations in life, and with ordinary errors of speech. WHAT THAT TO DO. A Companion to Small 18mo, cloth, gilt, uniform with Boudoir Edition of "Don't," 30 cents. A dainty little book, containing helpful and practical explanations of social usages and rules. RRORS IN THE USE OF ENGLISH. ER By the late WILLIAM B. HODGSON, LL. D., Fellow of the College of Preceptors, and Professor of Political Economy in the Uni versity of Edinburgh. 12mo. Cloth, $1.50. D. APPLETON AND COMPANY, NEW YORK. THE MODERN SCIENCE SERIES. Edited by Sir JOHN LUBBOCK, Bart., F. R. S. HE CAUSE OF AN ICE AGE. By Sir ROBERT BALL, LL. D., F. R. S., Royal Astronomer of Ireland; author. of "Star Land," The Story of the Sun," etc. "Sir Robert Ball's book is, as a matter of course, admirably written. Though but a small one, it is a most important contribution to geology."-London Saturday Review. "A fascinating subject, cleverly related and almost colloquially discussed."-Philadelphia Public Ledger. THE HE HORSE: A Study in Natural History. By "The author admits that there are 3,800 separate treatises on the horse already pub. lished, but he thinks that he can add something to the amount of useful information now before the public, and that something not heretofore written will be found in this book. The volume gives a large amount of information, both scientific and practical, on the noble animal of which it treats."-New York Commercial Advertiser. THE THE OAK: A Study in Botany. By H. 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