INDEX 



489 



Iguana, 319, 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, 

 35~3QJ to the household, 57~6i ; 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, 71-72 ; 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, 288. 

 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. 



lab rum, 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, lo-ll ; of honeybee, 



27-29. 



lemming, 415-416. 

 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 Ameba, 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. 

 Lymn&a, 162, 163. 

 lymph, 250. 

 lymphatic system, 406. 

 lynx, 428. 



mackerel, 288, 289. 



macronucleus, 219. 



maggot, 20. 



Malacostraca, 144. 



malaria, 87-93, 227. 



Malpighian tubules, 12, 16. 



Mammalia, 7, 234. 



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

 boreal, 398 ; circulation in, 406 ; claws 

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

 403; domesticated, 450-451; ear of, 

 409; egg laying of, 419-420 ; excretion 

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



