244 



INDEX AND GLOSSARY. 



Function, the office which an organ 

 is designed to perform, 29. 



Galeopithe-cus, its facilities for 

 leaping, 93, 207. 



Galerltes, 233. 



Gallinaceous, birds allied to the do- 

 mestic fowl, 190. 



Gallop, 91. 



Ganglions, scattered nervous mass- 

 es, from which nervous threads 

 arise, 46. 



Ganoids, fishes having large, bony, 

 enamelled scales, mostly fossil, 20. 



Gar-pike, 192. 



Gasteropods, mollusks which crawl 

 by a flattened disk, or foot, on 

 the under part of the body, like 

 the snail, 22. 



Gastric juice, 99. 



Gavial, a crocodile, with a long, 

 slender head. 



Gemmiparous reproduction, propa- 

 gation by budding, 156. 



General properties of organized 

 bodies, 35. 



Genus, 17- 



Geographical distribution of ani- 

 mals, 186 ; conclusions, 207. 



Geological succession of animals, 

 214. 



Germ, the earliest manifestation of 

 the embryo, 42, 141. 



Germinative disk, 133, 137, 141 ; 

 vesicle, 133, 137, 138; dot, 137,138. 



Gestation, the carrying of the young 

 before birth, 135. 



Gills, 31, 120, 124. 



Gizzard, 99. 



Glacial period, 236. 



Glands, 127 ; salivary, 127. 



Globules of chyle, 100. 



Glottis, 65. 



Goniomya, 230. 



Grallatores, birds with long legs for 

 wading, 20. 



Grand-nurses of Cercaria, 162. 



Granivorous, birds feeding on grain. 



Grit, coarse sandstone, 216. 



Gullet, 99. 



Hamites, 232. 



Hand, 83. 



Harmony of organs, 106. 



Harpes, 225. 



Hearing, 55. 



Heart, 114. 



Herbivora, animals feeding on grass 

 and leaves, 20. 



Hibernation, torpid state of ani- 

 mals during winter, 123. 



Hippurites, 233. 



Holothurians, soft sea-slugs, biche- 

 le-mar, 23. 



Homogeneous, uniform in kind, 126. 



Homology, 30. 



Humerus, the shoulder-bone, 81. 



Hyaline matter, pure, like glass, 39. 



Hydra, egg of, 133 ; propagation of, 

 156, 158. 



Hydrogen, a gas which is the prin- 

 cipal constituent of water, 41. 



Hydroids, a family of polyps, 23. 



Ichthyosaurus, 229, 232. 



Icterus Baltimore, nest of, 70. 



Igneous, that have been acted upon. 

 by fire, 215. 



Iguanodon, 229. 



Imbibition, 127. 



Inanimate, destitute of life, 43. 



Incisor teeth, 106. 



Incubation, hatching of eggs by the 

 mother, 136. 



Infusoria, microscopic animals in- 

 habiting water, not yet fully ar- 

 ranged in their proper classes, 24, 

 32 ; motions of, 40 ; generation of, 

 172. 



Inoceramus, 232. 



Inorganic, not made up of tissues, 35. 



Insalivation, 108. 



Insects, number of, 27- 



Insessores, perching birds, like 

 birds of prey, 20. 



Instinct, 67, 69. 



Intelligence, 67, 68. 



Intercellular passages, 37. 



Invertebrates, animals destitute of 

 a back-bone. 



Iris, the colored part of the eye, 40. 



Is6telus, 225. 



Jelly-fish. See Medusa. 

 Judgment, 68. 



Kidneys, 130. 



Labyrinthodon, 228. 



Lacertans, animals of the lizard 



tribe, 20. 

 Lacteals, vessels which take up the 



nutriment, 100 

 Larnellibranchiates, mollusks hav- 



