INDEX 



Actinocephalus ohgacanthus (illus.), 

 216. 



Adaptation, 56, 327; categories of, 

 328. 



Aid, mutual, 369. 



Allen, J. A., 136, 206. 



Altmann, theory of protoplasmic 

 structure, 250. 



Amaryllids, sports of (illus.), 103. 



Amblystoma opacum (illus.), 20. 



Amitosis, 252. 



Amoeba eating one-celled plant 

 (illus.), 31; moving (illus.), 30; 

 poly podia, stages of fission 

 (illus.), 31; reproduction of, 

 213; (illus.), 214. 



Amphimixis, 154. 



Analogy, between variations in 

 species and in languages, 325; 

 defined, 173; in wings of ani- 

 mals, (illus.), 173. 



Anaphase, defined, 256. 



Andrena, nest of (illus.), 384. 



Andricus cah/ornicus, galls pro- 

 duced by (illus.), 342. 



Anemone, sea, with algae in body 

 wall (illus.), 377. 



Anosia plexippus and its mimic 

 (illus.), 422; metamorphosis of 

 (illus.), 235. 



Antlion, larva, excavating pit 

 (illus.), 330. 



Ants, castes of (illus.), 391; com- 

 mensal life with aphids, 374; 

 communal life of, 391; nest of 

 (illus ), 392; (illus.), 393; social 

 parasitism of, 375; symbiosis 

 with plants, 377. 



Apes, anthropoid, classification of, 



454; ears of (illus.), 174. 

 Aphids, commensal life w r ith ants, 



374. 

 Appendix vermiformis, of kangaroo 



and man (illus.), 179. 

 Apple, hybridized mosaic (illus.), 



101; seedlings of the Williams 



Early (illus.), 102. 

 Aquila chrysaetus (illus.), 44. 

 Arbacia, extra-ovates of (illus.), 281; 



viridis, regeneration in (illus.), 



282. 

 Archceopteryx lithographica (illus.), 



302. 

 Ascaris megalocephala, spermato- 



genesis of (illus.), 264; (illus.), 



265; (illus.), 271; var. uni- 



valens, cell division in (illus.), 



258. 



Ascidian (illus.), 42; (illus.), 364. 

 Asters, defined, 254. 

 Atavism, 166. 

 Australia, rabbit and other plagues 



of, 65. 

 Aythya, family of (illus.), 443. 



Barnacle (illus.), 365; metamor- 

 phosis of (illus.), 234. 



Barriers, geographic, 316; influences 

 of geographic, 128. 



Bascanion constrictor (illus.), 43. 



Basilarchia archippus, mimicking 

 Anosia (illus.), 422. 



Bates, H. W., 402. 



Bateson, Win., 141, 147, 148, 192. 



Bat tick, wingless (illus.), 351. 



Beavers making nests (illus.), 437. 



477 



