Castle 176-180 Cat 33 Cell 90, 91 Chance variations 37 Chick 16, 17, 20 Chromatin 184 Chromosome group of Drosophila 102 Chromosomes 91, 95, 96, 98, 130, 131, 132 Cleavage 21, 22, 94 Clover butterfly 62 Club wing 69, 70, 108 Colias philodice 62 Color blindness 77, 125 Comb of Drosophila 103 Combs of fowls 33, 54 Comparative anatomy 7, 8, 9, 14 Corn 150, 153, 172 Correns 41 Cosmogonies 27 Cream eye color 163, 164 Crepidula 22 Criss-cross inheritance 78 Crossing over 131-133 Cuénot 178 Curled wing 115 Curved wing 111 Curve of probability 149 Cut wing 11, 104 Dachs legs 112 Dahlgren 62 Darwin 15, 24, 28, 32, 35-37, 64, 145, 146, 152, 154-156 Dendy 188 De Vries 18, 147, 156 Dexter 170 Dichaete 114 Difflugia 184-187 Discontinuous variation 13 Disuse 31 Drosophila ampelophila 10, 12, 13, 48-50, 60, 75, 84, 85, 93, 100, 103, 119, 155, 162, 169 Drosophila repleta 76 Duplication of legs 109 Dwarf 114 East 170, 172 Ebony 50, 55, 56, 115 Egg 91, 94 Elephant 191 Elephants' skulls 188 Elephants' trunks 190 Embryology 13-23 Emerson 172 Environment 27 Eosin eye color 61, 107, 163 Erdmann 183 Evolution Creatrice 30 Evolution--three kinds of 1, 2, 4 Eye color 13 Eyeless 66, 115 Factorial theory 89 Factors of Drosophila 143 Fantails 172, 175 Fertilization 91 Fish 16, 20, 21 Flatworms 22 Fluctuations 12 Forked bristles 106 Fowl 77 Fused veins 107, 108 Galton 154 Geneticist 26 Germ-plasm 142 Geoffroy St. Hilaire 27 Giant 114 Gill-slits 20, 21, 23 Groups I, II, III, IV 100-118 Haeckel 15 Haemophilia 77 Heliotropism 106, 107 Himalyan rabbits 83 History 1, 6 Hoge 66 Horse, evolution of 6 Indian corn 172, 173 Interference 137, 138 Janssens 132 Jaunty wing 111 Jennings 161, 181-184, 186 Johannsen 156, 157, 159-161, 166, 182 Lamarck 31-34 Langshan 77 Leaves 147 Leidy 186 Lethal 105 Linkage groups 103 Lizard 23 Localization of factors 118 MacDowell 155, 170, 171 Macritherium 191 Mammal 16, 21, 23 Man 20, 77, 125, 126 Map of Chromosomes 136 Maroon eye color 114 Mendel 40, 41, 52, 89 Mendelian heredity 39 Mendel's law 41-59, 64, 124 Mendel's second law 52 Mesenchyme cells 22 Mesoderm cells 22 Metaphysician 30 Mice 33, 178 Middleton 183 Miniature wing 108 Mirabilis 42 Modifiers 163, 164, 170, 171 Molluscs 22 Mouse 83 Muller 112, 167 Mutations 35, 39, 84 Nägeli 34, 35 Natural Selection 36, 145, 146, 187-194 Nisus formativus 34 Non-disjunction 139-142 Notch wing 104-106 Nucleus 91 Origin of Species 35, 145 Orthogenesis 34