INDEX 



489 



Iguana, 3 ig, 320, 333. 



incisors, 405. 



infantile paralysis, 100. 



Infusoria, 233. 



ingestion of food, 223 (see digestion). 



injurious, insects, to field crops, 33-35 ; 

 to fruits, 39-42 ; to garden vegetables, 

 35~39; to the household, 57-61; to 

 shade trees, 42-47. 



insectivores, 421. 



insects, 7; and disease, 98-101; bene- 

 ficial, 62-72; classification of, 107; 

 food for man, 67 ; injurious, 32-61 ; 

 parasitic, 71-7 2 ; predaceous, 70-71; 

 scavenger, 67. 



intestine, of earthworm, 171 ; of grass- 

 hopper, 12, 14; of mussel, 147, 151 

 (see digestion). 



invertebrates, 7, 234. 



irritability, 234. 



jaguar, 429. 



jaws, of grasshopper, 13; of snail, 160, 



161 (see skeleton). 

 jay, 375. 389- 

 jellyfish, 7, 207. 

 jewfish, 2S8. 

 jigger, 125. 

 joints, 256. 



kallima butterfly, 29, 30. 



kangaroo, 421. 



katabolism, 220. 



kidney, of frog, 252; of mammal, 407; 



of mussel, 147, 151 (see excretion), 

 killdeer, 342, 353, 355, 367- 

 kingfisher, 344, 355, 368, 372. 

 kite, 370. 

 kiwi, 362, 363- 



labial palps, of mussel, 147, 150. 



labium, of grasshopper, 13. 



Laboratory, Marine Biological, 480. 



labrum, of grasshopper, 13. 



lac, 65. 



lacteals, 406. 



lamprey, brook, 270. 



lamprey eel, 268-270. 



lark, meadow, 380; prairie horned, 342, 



354- 

 larva, 20. 

 larynx, 406. 



laws, game, 464. 



leeches, 175. 



legs, of grasshopper, io-ll ; of honeybee, 



27-29. 

 lemming, 415-4I6. 

 lemur, 443, 444. 

 lens, 261, 408 (see eye). 

 Lepidoptera, 108. 

 Leucosolenia, 211, 212. 

 lice, biting, 54; body, 54, 55; chicken, 



54, 55 ; crab, 54, 55 ; elm-bark, 46 ; 



head, 54, 55; plant, 35, 36, 41-42; 



sucking, 54; wood, 141. 

 life, origin of, 244. 

 Limax, 161. 

 Linnaeus, 67, 103, 473. 

 lion, mountain, 429. 

 liver, of frog, 247, 253; of mussel, 147, 



151- 

 lizards, 319-322. 

 llama, 450. 



lobster, 130, 131, 142. 

 locomotion, of Amcba, 223; of crayfish, 



133; of earthworm, 168; of fish, 272; 



of grasshopper, 9-13 ; of insects, 24- 



25 ; of mammals, 402 ; of mussel, 146 ; 



of snail, 159. 

 locust, Carolina, 9, 14, 17; differential, 



21, 22; migratory, 20; red-legged, 21, 



22 ; Rocky Mountain, 18. 

 locust borer, 46. 

 lungs, of bird, 349; of frog, 247, 250; of 



mammals, 406; of snail, 159, 161; of 



spider, 113, 114. 

 Lymncea, 162, 163. 

 lymph, 250. 

 lymphatic system, 406. 

 lynx, 428. 



mackerel, 288, 289. 

 macronucleus, 219. 



maggot, 20. 



Malacostraca, 144. 



malaria, S7-93, 227. 



Malpighian tubules, 12, 16. 



Mammalia, 7, 234. 



mammals, 39S-459 ; aquatic, 398; ar- 

 boreal, 39S; circulation in, 406; claws 

 of, 401 ; color of, 400 ; digestion in, 

 403; domesticated, 450-451; ear of, 

 409 ; egg laying of, 419~42o ; excretion 

 in, 407 ; eye of, 408 ; flesh-eating, 423- 



