INDEX. 
405 
Heart, development of, 200, 168. 
“ of Mollusks, 106. 
“ of Tunicates, 10T, 279. 
“ of Vertebrates, 107-109, 71-74. 
Heat, 121. 
Hedgehog, 346. 
Helix, 275, 232. 
Ilemiptera, 297, 265, 266. 
“ month of, 59. 
Heron, 332, 313. 
Heterocercal, 159, 123. 
Heteromya, 272. 
Hippopotamus, 352. 
“ foot of, 129. 
Histology, 12. 
Hog, 352. 
“ teeth of, 67. 
Holothuroidea, 262, 215. 
Homarus, see Lobster. 
Homo, see Man. 
Homocercal, 159, 287. 
Homology, 217. 
“ serial, 218. 
Homomorphism, 217. 
Hoofs, 136, 103. 
Hornera, 267, 220. 
Horns, 136. 
Horse, brain of, 171,13S. 
“ hoof of, 136,164, 103, 129. 
“ skeleton of, 151, 117. 
“ skull of, 144, 111. 
“ splint-bones of, 207. 
“ stomach of, 88, 53. 
Horse-fly, mouth of, 60, 24. 
Horseshoe-crab, 284. 
“ “ jaws of, 53. 
“ “ skeleton of, 131. 
Hummer, 335. 
Hyalea, 274, 229. 
Hydra, 246, 191. 
“ budding of, 192. 
“ digestive cavity of, 75. 
“ nerve-cells of, 168. 
“ repair of, 215. 
Hydroid, see Hydrozoa. 
Hydrozoa, 246,178, 191-196. 
“ development of, 205. 
“ metamorphosis of, 212. 
“ see Jelly-fish. 
Hyena, 355. 
Hymenoptera, 303, 22, 42, 81, 277. 
“ see Bee. 
Hypoblast, 199. 
Ibis, 332. 
Ichneumon, 304. 
Ichthyopsida, 309. 
Ichthyosaurus, 324. 
Idotia, 286, 251. 
Iguana, 322. 
Incisors, 68. 
Individual, 220. 
Infusoria described, 243, 160. 
“ digestive cavity of, 75. 
“ fissiou, 191,160. 
“ mode of feeding of, 50. 
“ motion of, 154. 
“ mouth of, 55. 
“ respiration of, 112. 
“ skin of, 127. 
Inheritance, 217. 
Iusectivora, 346. 
Insecta, 291. 
“ absorption of, 94. 
“ alimentary canal of, 79, 41-43- 
“ anatomy of, 43, 81. 
“ antennae of, 147. 
“ chrysalis of, 172. 
“ circulation in, 105, 292. 
• “ development of, 205. 
“ ear of, 179. 
“ eye of, 181, 155, 156. 
“ feet and legs of, 162, 127, 131. 
“ flight of, 159. 
“ gizzard of, 79. 
“ heart of, 105, 69. 
“ kidney of, 126, 41, 42. 
“ liver of, 124. 
“ locomotion of, 159,162. 
“ metamorphosis of, 207, 172, 173, 
264-267. 
“ mouth of, 57. 
“ mouth-parts of, 53, 21-24. 
“ muscles of, 156, 131. 
“ nervous system of, 169, 43 
“ respiration in, 114,291. 
“ salivary glands of, 122. 
“ silk glands of, 40. 
“ skeleton of, 132, 292, 98, 262. 
“ smell of, 178. 
“ spiracle of, 114, 79. 
“ touch of, 177, 147. 
“ tracheae of, 114, 40, 80, 81. 
“ wings of, 159. 
Insessores, 337, 322-328. 
Inspiration, modes of, 115,119,120. 
Instinct, 184. 
Intelligence, 187. 
Intestine of Amphibian, S2. 
“ of Bird, 84. 
“ of Fish, 81. 
“ of Mammal, 85. 
“ of Reptile, 82. 
“ see Alimentary Canal. 
Isomya, 272. 
Ivory, 66. 
Jaws, 51-71. 
Jay, 339. 
Jelly-fish, 247, 193-197. 
“ blood of, 97. 
“ development of, 212, 178, 19&. 
