INDEX 
Globigerina-ooze, 18. 
Globigerinz, 16. 
Gontum, 25-30. 
Gonium pectorale (illus.), 25. 
Grasshopper, auditory organ of 
(illus.), 234. 
Green-leaf insect (illus.), 210. 
Gregarina, 13, 182. 
Gregarina polymorpha (illus.), 14, 
Gregarinida, 14. 
Gregariousness, 163. 
Growth, 78. 
Gryllotalpa (illus.), 146, 
Habit, 251. . 
Habitat, relation of species of, 283. 
Habits, domestic, 257. 
Habits, nest-making, of birds, 264; 
of fishes, 264; of insects, 262; of 
invertebrates, 258; of spiders, 
259; of vertebrates, 264, 
Hearing, sense of, 282. 
Heliosphera actinota (illus.), 19. 
Heredity, 89. 
Hermaphroditism, 60. 
Hermit-crab, with the sea-anemone 
(illus.), 176. 
Hibernation, 103. 
Hiving honey-bees (illus,), 154. 
Uolothurian, alimentary canal of 
(illus.), 70. 
Tomes, 257. 
TIoney-bee (illus.), 150; adult and 
larva (illus.), 83; leg of (illus.), 
151: life history of, 149. 
Honey-bees, hiving a swarm of 
(illus.), 154. 
Host, relation of parasite to, 179. 
Human degeneration, 200. 
Humming-bird, nest of 
(illus.), 265, 266, 
Hydra, 3%. 
rufus 
323 
Hydra vulgans (illus.), 38. 
Hydrophilus (illus,), 146. 
Hyla regilla (illus.), 145. 
Icerya and Vedalia, 121. 
Icerya purchasi (illus.), 142, 
Tleum, 68. 
Individual, 31. 
Indo-African realm, 301. 
Inorganic matter, 112. 
Insect galls on leaf (illus.), 144, 
Insects, metamorphosis of, 90; nest- 
making habits of, 262; parasitic, 
188. : 
Instinct, 242. 
Instincts, altruistic, 248; classifi- 
cation of, 248; concerned with 
care of the young, 250; egoistic, 
248; of climate, 248; of court- 
ship, 248; of environment, 248; 
of feeding, 244: of play, 247; of 
reproduction, 249: of self-de- 
fense, 245; variability of, 251. 
Intellect, 254. 
Intestine, 68. 
Invertebrates, nest-making habits 
of, 258. 
Irritability, 8, 240. 
Island, coral (illus.), 44. 
Itch-mite (illus.), 192. 
Jack-rabbits, showing variation 
(illus.), 281. 
Jay, Canada (illus.), 138. 
Jejunum, 68. 
Jelly-fish, eye of (illus.), 238, 
Jelly-fishes, 37; colonial, 45. 
Kallima (illus.), 211. 
Kangaroo (illus.), 189. 
Katydid, egg of (illus.), 79. 
Lady-bird beetles (illus), 214. 
