316 



INDEX 



Hapalidse, 160. 



Harvey, 70. 



Hawaiian Islands, 103 ; snails of, 

 104. 



Heredity, 142 ; a real human pro- 

 cess, 175 ; instinct determined by, 

 206 ; Anglo-Saxon, 213 ; of men- 

 tal qualities, 232. 



Heron, 44. 



Hesperornis, 99. 



Hippopotamus, 42. 



Hominidse, 160. 



Homo sapiens, 183. 



Hoofed animals, 95, 96, 97. 



Hornets, communities of, larvae of, 

 260. 



Horse, 41, 42, 65 ; place of in zoolog- 

 ical science, 95, 96 ; develop- 

 ment of, 97 ; perfection of one 

 type of, 136, 157 ; 167 ; intelligence 

 of, 209. 



House-fly, eggs of, 67. 



Human faculty, 212 ; its three con- 

 stituents, 212. 



Huxley, 6, 26, 30, 63, 184. 



Hydra, 50, 51, 52, 53, 68, 69; com- 

 parative study of, 204, 205, 206; 

 254; cells of, 255; 256, 257, 258, 

 261, 262, 263, 265, 266. 



Hydrogen, 25, 27. 



Hyracotherium, 96. 



Ichthyornis, 99. 



Ichthyosaurus, 9-^. 



Indians, American, pictography of, 

 223, 224; of BrazU, 227; life of, 

 272. 



Individual development, a r6sum6 

 of history of species, 63. 



Inertia, 155. 



Infant, human, activities of, 216. 



Ingestive structures, 17. 



Inheritance, 110, 131 ; biological 

 laws of, 142 ; paternal and mater- 

 nal basis of, 144 ; 145 ; Mendelian 

 phenomena of, 146 ; Galton's Law 

 of, 147 ; laws of, in mental phenom- 

 ena, 203 ; strength of, in mental 

 traits, 232 ; physical, provides 

 mechanism of intellect, 233. 



Insects, butterflies, beetles, bees, 

 grasshoppers, spiders, scorpions. 



49 ; 66 ; eggs of common house-fly, 

 67 ; 82 ; nervous mechanism of, 

 205; communities of, 207, 258- 

 260-267 ; nervous system of, 256, 

 257. 



Instinct, determined by heredity, 

 206 ; of higher animals, 208 ; differs 

 from intelligence in degree, 210. 



Intelligence, 203 ; in mental life of 

 communal insects, 207. 



Invertebrates, lower animals devoid 

 of backbone, 47 ; structural plan, 

 48 ; branches of, 49 ; groups, two 

 layer animals, 50 ; hydra, sea- 

 anemones, soft-polyps, 50 ; more 

 complicated, 68 ; palseontological 

 materials, 82 ; evolution of lowest 

 members, 92. 



Jaguar, 101. 



Jastrow, 294. 



Java, 173. 



Jellyfish, 81. 



Jordan, David Starr, 123. 



Kangaroo, 42. 

 Keane, 185. 



Lamarck, 115, 133, 135. 



Lampreys, 156. 



Language, most important single 

 possession of mankind, 218. 



Laplace, 29. 



Larvae, of lobster, 66 ; of insects, 

 67 ; of ground wasp, 207 ; of cater- 

 pillar, 259 ; of wasps, 260. 



Lavoisier, 29. 



Law of Recapitulation, 66 ; stated by 

 Von Baer and Haeckel, 71. 



Lemurs, 158, 160, 161, 195. 



Life, what is it? 27. 



Limestone, 89, 90. 



Links, 99. 



Linnaeus, 79, 158, 183. 



Lions, 101 ; environment of, 112. 



Lizard, nearest form to remote an- 

 cestor, 45. 



Lobsters, 66 ; larvae of, 66. 



LyeU, 80, 107, 135, 136. 



MacDougal, 148. 

 Madagascar, 161. 

 Mallock, 295. 



