XXII. THE THEORY OF SOUND IN ITS RELATION TO MUSIC. By Prof. PIETRO BLASERNA, of the Royal University of Rome. Numerous Woodcuts. $1.50 XXIII. STUDIES IN SPECTRUM ANALYSIS. By J. NORMAN LOCKYER. Illustrations. $2.50. XXIV. A HISTORY OF THE GROWTH OF THE STEAM-ENGINE. By ROBERT H. THURSTON, A. M., C. E., Prof. of Mechanical Engineering in the Stevens Ins. of Technology, Hoboken, N. J. 163 Illustrations. $2.50. XXV. EDUCATION AS A SCIENCE. By ALEXANDER BAIN, LL. D., Professor of Logic in the University of Aberdeen. $1.75. XXVI. MODERN CHROMATICS, with Applications to Art and Industry. By OGDEN N. ROOD, Professor of Physics in Columbia College. 130 original Illustrations. _D. APPLETON & CO., Publishers, 549 & 551 Broadway, New York._ THE INTERNATIONAL SCIENTIFIC SERIES. THE HUMAN SPECIES. BY A. DE QUATREFAGES, PROFESSOR OF ANTHROPOLOGY IN THE MUSEUM OF NATURAL HISTORY, PARIS. NEW YORK: D. APPLETON AND COMPANY, 549 AND 551 BROADWAY. 1879. CONTENTS. BOOK I. UNITY OF THE HUMAN SPECIES. CHAPTER I. PAGE EMPIRES AND KINGDOMS OF NATURE.—THE HUMAN KINGDOM.—ANTHROPOLOGICAL METHOD 1 CHAPTER II. GENERAL ANTHROPOLOGICAL DOCTRINES; MONOGENISM AND POLYGENISM 30 CHAPTER III. SPECIES AND RACE IN THE NATURAL SCIENCES 35 CHAPTER IV. NATURE OF VARIATIONS IN ANIMAL AND VEGETABLE RACES; APPLICATION TO MAN 41 CHAPTER V. EXTENT OF VARIATIONS IN ANIMAL AND VEGETABLE RACES; APPLICATION TO MAN 47 CHAPTER VI. INTERCROSSING AND FUSION OF CHARACTERS IN ANIMAL RACES; APPLICATION TO MAN 56 CHAPTER VII. CROSSING OF RACES AND SPECIES IN THE ANIMAL AND VEGETABLE KINGDOMS.—MONGRELS AND HYBRIDS 63 CHAPTER VIII. CROSSING BETWEEN VEGETABLE AND ANIMAL RACES AND SPECIES; MONGRELS AND HYBRIDS; REALITY OF SPECIES 70 CHAPTER IX. CROSSING BETWEEN HUMAN GROUPS.—UNITY OF THE HUMAN SPECIES 85 BOOK II. ORIGIN OF THE HUMAN SPECIES. CHAPTER X. ORIGIN OF SPECIES.—HYPOTHESES OF TRANSMUTATION.—DARWINISM 89 CHAPTER XI. ORIGIN OF THE HUMAN SPECIES.—DIFFERENT HYPOTHESES 104 BOOK III. ANTIQUITY OF THE HUMAN SPECIES. CHAPTER XII. AGE OF THE HUMAN SPECIES.—PRESENT GEOLOGICAL EPOCH 129 CHAPTER XIII.