576 



INDEX 



earthworm, 292; in Protozoa, 160, 

 167, 171, 183. 



Inheritance, 456; with dominance, 

 466; without dominance, 467, 468. 



Inheritance of Acquired Character- 

 istics, Theory of, 539, 542, 643; 

 criticism of, 541; history of, 539. 



Inorganic evolution, 6, 489; see also 

 Evolution. 



Insecta, 339, 340, 342; classification 

 of, 241, 371. 



Insects, in relation to disease, 209. 



Instincts, 113, 319. 



Insulin, 101. 



Internal organization, types of, 244, 

 245; see also Body plan. 



Interstitial cells, 252. 



Intestinal juice, 83. 



Intestine, 47, 354. 



Invertebrates, 36; evolution of, 513, 

 514. 



Irritability, 76, 106, 128; of earth- 

 worm, 301; of Hydra, 262; of 

 Protozoa, 158, 164, 170, 182, 192. 



Ischnoptera, 346. 



Islands of Langerhans, 101, 102. 



Isogametes, isogamy, 174, 187. 



Isolation, as a cause of evolution, 563. 



Jellyfish, see Hydrozoa and Scypho- 



zoa. 

 Jennings, 158, 560. 

 Johannsen, 460, 560. 

 Jungle-fowl, 523, 526. 

 Juvenile stages of frog, 419. 



Katydid, 377; see also Microcentrum. 



Kerona, 254. 



Kidney, 52, 416; blood vessels of, 



53 ; excretion through, 94; tubules 



of, 52, 53, 95. 

 Kincaid, 563. 

 King crab, 341. 

 Koch, 204. 



Labium of locust, 347. 

 Labrum of locust, 346. 



Labyrinthodontia, 12. 



Lactase, 85. 



Lacrymaria, 176. 



Lady beetle, 551. 



Lamarck, 441, 541; Theory of 

 inheritance of acquired character- 

 istics of, 539. 



Lamprey, 37. 



Large intestine, 47; bacterial diges- 

 tion in, 85. 



Larva, of Crustacea, 336; of frog, 

 414; of insects, 350, 383, 384, 386, 

 387; of Nereis, 313; ofObeha, 275. 



Lar3Tix, 62, 416. 



Leeuwenhoek, 203. 



Leg, of locust, 42, 347; of man, 42. 



Leopard frog, 12, 15; see also Rana 

 pipiens. 



Lepidoptera, 375, 380. 



Lepidosiren, 421. 



Lepisma, 372. 



Leptinotarsa decemlineata, 383. 



Leucocytes, 103, 145, 146, 357. 



Life, 75; origin of, 489. 



Life cycle, of Amoeba, 163; of army 

 worm, 382; of black ant, 394; of 

 blister beetle, 383 ; of cabbage bug, 

 379; of earthworm, 305; of 

 Euglena, 171; of frog, 23; of 

 honey-bee, 391; of Hydra, 273; 

 of locust, 369; of monarch butter- 

 fly, 380; of Monocystis, 191; of 

 mosquito, 386; of Obelia, 275, 277; 

 of Paramoecium, 184; of Plasmo- 

 dium, 208; of Trypanosoma, 210. 



Limbs of vertebrates, 39; skeleton of, 

 20. 



Limulus, 341. 



Linear colonies, 195, 196. 



Linin net, 135. 



Linkage, 479. 



Lionotus, 176, 189. 



Lipase, 83. 



Lipins, 74; digestion of, 83. 



Lipoid substances, 73. 



Liriope, 277. 



Lissamphibia, 12. 



Lister, 204. 



