INDEX 



All numbers refer to pages. Scientific names are printed in italics, 

 type are numbers of pages on which there are figures. 



Numbers in black 



absorption, in crayfish, 134 ; in frog, 248. 



Acarina, 120. 



adaptations, of insects, 24-31. 



adder, puff, 325. 



adrenal bodies, 254. 



aerial habitat, 2. 



Agassiz Association, 390. 



aigrettes, 349, 384, 385. 



air, bladder, 275 ; sac, 349. 



albatross, wandering, 365. 



alimentary canal, 12, 13 (see digestion 

 and digestive system). 



alligator, 332. 



alternation of generations, 205-206. 



alveoli, in lungs of frog, 250. 



Ameba, 222-224; food of, 223; funda- 

 mental properties of, 241 ; locomotion 

 of, 223 ; physiological activities of, 

 223 ; reproduction of, 223. 



Amphibia, 7, 234, 299-308; hibernation 

 of, 305 ; economic importance of, 307 ; 

 poisonous, 305 ; regeneration of, 304 ; 

 tailed, 299; tailless, 301. 



Amphineura, 158. 



anabolism, 241. 



anaconda, 326. 



anal spot, of Paramecium, 219. 



anatomy, of mussel, 147. 



animals (see mammals). 



Annelida, 7, 168, 177. 



Anodonta, 152. 



Anopheles mosquito, 87, 227. 



ant, and plant lice, 41, 42 ; house, 58-59. 



anteater, 434. 



antelope, pronghorn, 438-439. 



antennae, of crayfish, 131, 133 ; of 

 Cyclops, 140, 141. 



antennule, of crayfish, 131, 133. 



Anthozoa, 210. 



anthrax, 100. 



anus, of grasshopper, 12, 14. 



aorta, of mussel, 147, 151. 



apes, 444-446. 



aphid, 41-42. 



Aptera, 19, 108. 



aqueous humor, 408. 



Arachnida, 107; classification of, 119- 

 120; relations of, to man, 121-127. 



Araneida, 120. 



Arcella, 225. 



Archaopteryx, 360, 362. 



Argonanta, 166. 



Aristotle, 105, 472. 



armadillo, 235, 435. 



army worm, 33-35. 



arteries, of frog, 249 (see circulation and 

 circulatory system). 



Arthropoda, 7; classification of, 107. 



Ascaris, 179, 182. 



ass, 441, 451. 



assimilation, 14, 220, 248. 



atoll, 209, 210. 



auditory, capsule, 254 ; organs, of grass- 

 hopper, 17. 



Audubon Society, 385, 390. 



auk, great, 363, 464. 



auricle, of frog, 249 (see circulation and 

 circulatory system). 



Aves, 234 (see birds). 



Bacteria, 73, 74, 231 ; non-pathogenic, 



74 ; pathogenic, 74. 

 badger, 427, 454, 455. 

 barb, 339, 346. 

 barbule, 339, 346. 

 barnacle, 138, I3Q-140. 

 barriers, law of, 417. 

 basal disk, of Hydra, 199. 

 basket star, 195. 

 bass, black sea, 288 ; large-mouthed 



black, 287 ; rock, 287 ; small-mouthed 



black, 287; striped, 288. 

 bat, 422. 



beaks, of birds, 338, 343. 

 bear, 414, 465 ; black, 425 ; brown, 425; 



grizzly, 425 ; polar, 425. 



483 



