| PAGE |
| Introduction | [xiii] |
| System of Classification | [xiv] |
| Definition of Evolution | [xv] |
| [SECTION I.] |
| Organic Cells: The Visible Units of Life | [3] |
| Structure and Composition of Cells | [4] |
| Activities of Cells | [7] |
| Examples of Unicellular Animals and Plants | [10] |
| Mitosis | [25] |
| Maturation of the Human Ovum | [29] |
| Fertilization of the Human Ovum | [29], [42] |
| Segmentation of the Oösperm | [31] |
| Gastrulation | [32] |
| [SECTION II.] |
| Heredity with Variation | [39] |
| Examples of Variations | [39] |
| Illustrations of Heredity | [40] |
| Nucleus in Heredity | [41] |
| Heritages | [47] |
| Pseudo-Heredity | [53] |
| Environment and Variations | [55] |
| Acquired Characters | [65] |
| Pangenesis | [66] |
| Continuity of Germ-Cells | [67] |
| Modified Pangenesis | [68] |
| Heredity Stronger than Environment | [75] |
| [SECTION III.] |
| Unstable Environment | [81] |
| Development of North America | [85] |
| Archæan Era | [85] |
| Palæozoic Era | [86] |
| Silurian Period | [87] |
| Devonian Period | [87] |
| Carboniferous Period | [87] |
| Jurassic Period | [88] |
| Cretaceous Period | [88] |
| Tertiary Period | [89] |
| Quaternary Period | [89] |
| [SECTION IV.] |
| Transmutations of Living Forms | [93] |
| Archæan Era | [94] |
| Table of Stratified Rocks and the Successive Appearance of Typical Life-Forms | [95] |
| Cambrian Period | [96] |
| Lower Silurian Period | [96] |
| Upper Silurian Period | [98] |
| Devonian Period | [100] |
| Carboniferous Period | [102] |
| Permian Period | [104] |
| Triassic Period | [105] |
| Jurassic Period | [106] |
| Cretaceous Period | [108] |
| Tertiary Period | [110] |
| Quaternary Period | [113] |
| [SECTION V.] |
| Natural Selection | [119] |
| Artificial Selection | [120] |
| Multiplication of Animals | [122] |
| Elimination of the Unfit | [125] |
| The Coloration of Animals and Environment | [127] |
| Protective Coloration | [128] |
| Protective Resemblance | [138] |
| Alluring Coloration | [141] |
| Warning Coloration | [144] |
| Mimicry | [147] |
| Recognition Marks | [150] |
| Sexual Selection | [152] |
| Insect Selection | [160] |
| Isolation of Varieties | [166] |
| [SECTION VI.] |
| Evolution of Man | [173] |
| Development of the Frog | [173] |
| Development of Man | [180] |
| Useless Scaffolding in Man | [191] |
| Development of the Brain | [199] |
| The Brain and Psychic Phenomena | [206] |
| Evolution and Social Problems | [222] |
| [SECTION VII.] |
| Classification of Animals and Plants | [227] |
| Protozoa | [229] |
| Porifera | [230] |
| Cœlenterata | [230] |
| Echinodermata | [231] |
| Vermes | [232] |
| Arthropoda | [233] |
| Mollusca | [233] |
| Vertebrata | [234] |
| Tunicata | [234] |
| Leptocardii | [235] |
| Marsipobranchii | [235] |
| Pisces | [236] |
| Amphibia | [237] |
| Reptilia | [238] |
| Aves | [238] |
| Mammalia | [239] |
| Primates | [239] |
| Lemuroidea | [240] |
| Anthropoidea | [241] |
| Hapalidæ | [242] |
| Cebidæ | [242] |
| Cercopithecidæ | [242] |
| Simiidæ | [243] |
| Hominidæ | [243] |
| Flowerless Plants | [244] |
| Flowering Plants | [244] |
| [SECTION VIII.] |
| Works of Reference | [247] |
| [SECTION IX.] |
| Glossary | [255] |
| [SECTION X.] |
| Index | [277] |