INDEX 



AcMtis macularla, 223. 



Adamsiapalliata (illus.), 338. 



Adaptations, origin of, 290 ; classifi- 

 cation of, 290 ; for securing food, 

 292 ; for self-defense, 294 ; for ri- 

 valry, 301 ; for the defense of the 

 young, 302 ; concerned with sur- 

 roundings In life, 308 ; degree of 

 structural change in, 311. 



Adjustment to surroundings, 287. 



^figialitis vocifera, 224. 



jEthoprora, 447. 



Agassiz's cave fish (illus.), 173. 



Air-bladder, 165. 



Albatrosses, 219. 



Albula vulpes, 272. 



Alligator lizard (illus.), 352. 



Alligator mississippiemis (illus.), 

 199. 



Alligators (illus., 199), 198. 



Alluring coloration, 363. 



Alternation of generations, 49. 



Altricial nestlings of the blue jay 

 (illus.), 303. 



Alytes, 190. 



Amblystuma opacnm (illus.), 185 ; 

 tigrinnm (illus.), 186, 190, 191. 



American bittern, nestlings of (il- 

 lus.). 393, ?94. 



Ammonite (illus.), 429. 



Ammonites humphreslanus (illus.) 

 429. 



Amoeba (illus.), 23; multiplication 

 of by simple fission (illus.), 71, 

 255, 372. 



Amphibians, 182. 



Amphipods (illus., 122), 121. 



Andrena (illus.), 325. 



Andricus callfornicus (illus.), 308. 



Angnillula (illus.), 68. 



Animal functions, 12. 



Animal life, conditions of, 1, 4; 

 realms of, 441. 



Animal products used in the arts,411. 



Animals, families of, 17 ; higher 

 groups of, 17 ; simplest, 22 ; sin- 

 gle-celled, 22 ; simple and complex, 

 31 ; of uncertain relationships, 83 ; 

 crowd of, 281 ; domestic. 404 ; ser- 

 vices of, 406 ; used as food, 406 ; 

 clothing from, 409 ; as ornaments, 

 410; as enemies and destroyers, 

 412; as servants, 415; as friends, 

 415 ; of the past, 417 ; extinct, 

 417; mammoth (illus.), 417; be- 

 coming extinct, 419. 



Animals and plants, comparison of, 1. 



Anna hummer (illus.), 230, 231. 



Annelids, 72. 



Anosia plexippus (illus.), 141 ; (il- 

 lus.), 268, 365. 



Ant-eaters, 443. 



Antedon (illus.), 158. 



Autennarins, 364. 



Anthropithecus, 430. 



Anthropopithecwt, 250. 



Antilocapra americana, 246. 



Ant-lions, 134, 135 (illus.), 136. 



Antrostomus vociferns, 230. 



Ants, 142 (illus. )', 320. 



Aphidte, 321. 



Aptera, 133. 



Aquila chrysntus, 226 (illus.), 237. 



Arachnida, 110, 143. 

 449 



