INDEX 



The numbers refer to pages ; illustrations are indicated by boldface type. 



Abiogenesis, 130. 



Acetylene, 49. 



Adaptation, general, 259 ; aquatic, 

 260 ; aerial, 262 ; subterranean, 

 263; protective, 266; for seed 

 dispersal, 278. 



Adaptive response, 253. 



Adrenalin, 88. 



Aerial adaptation, 262. 



Aerobic organisms, 63. 



Agamy, 167. 



Alimentary system, in animals, 

 104 ; in plants, 126. 



Alisma, reproduction, 180. 



Alternation of generations, ani- 

 mals, 171 ; plants, 175. 



Amitosis, 93. 



Amoeba angulata, 32 ; A. proleus, 

 31 ; reproduction, 166. 



Anabolism, 56. 



Anaerobic organisms, 63. 



Anaesthetics, 67. 



Analogy, 47. 



Anisogamy, 144. 



Annelid, structure, 119. 



Anolis, 254. 



Anosia plexippus, 271. 



Ant-guests, 265. 



Antiseptics, 67. 



Anti-toxins, 256. 



Aphis, life-history, 167; with ants, 

 281. 



Apogamy, 183. 



Appendix vermiformis, 312. 



Aquatic adaptation, 260. 



Assimilation, 30. 



Associations, of animals, 279; of 

 plants and animals, 293. 



Bacteria, fission, 136; nitrogen- 

 fixing, 76 ; putrefactive, 74. 



Beans, pure lines in, 221. 



Beroe, 261. 



Biffin, experiments with wheat, 235. 



Binomial nomenclature, 279. 



Biogenesis and abiogenesis, 130. 



Blastogenic variations, 213. 



Blastopore, 162. 



Blastula, 160. 



Bodo lens, 142. 



Bonnet, 191. 



Bose, R. C., 248. 



Bougainvillea, 172. 



Budding, 136; in Hydra, 138; 



in Syllis, 139; permanent, 139; 



in animals, 132. 



Carbohydrates, 12. 



Carbon cycle, 72. 



Care of the young, 272. 



Carnivorous plants, 59. 



Cell, 18, 20 ; various kinds, 22. 



Cellular structure of leaf, 19. 



Cellulose, 41. 



Cell wall, an adaptive structure, 24. 



Centrosome, 21, 94; nature of, 98. 



Choetopterus, 169. 



Chemical agents, effect of, on 



growth, 103. 



Chemical environment, 245. 

 Chromatin, 23. 

 Chromosome, 94. 

 Chrysanthemum segetum, variation, 



207. 

 dona intestinalis, 40. 



Circulatory system, in animals, 

 115. 116; in plants, 126. 



"leavage, of animal egg, 157. 



"lover as a fertilizer, 76. 



Colloids, 15. 



Coloration, protective, 267 ; ag- 

 gressive, 269. 



325 



