NDEX 



[The references are to the pages. The bold-faced type indicates 

 the pages on which illustrations occur.] 



Adaptation, 125; classification of, 

 126; to the inorganic environ- 

 ment, 128; to mates, 129; to 

 offspring, 130; social and com- 

 munal, 135; competitive, 136, 

 139; symbiotic, 137; protecti ve, 

 139; mimetic, 143 ; of parasites, 

 145; origin of, 148 



Age of man, 370 



Alligator, 313 



Alternation of generation, 179 



Ambulacral system, 211 



Amoeba, 155, 156 



Amphibians, 19, 20, 296 



Amphioxus, 276 



Anatomy, 4 



Animal industries, 405 



Annulates, 19, 21, 195 



Antennae, 260 



Ants, 2 50 



Anura, 301 



Apes, 356 



Aphides, 251 



Appendages, 62, 67 



Appendix, 409. 



Apteryx, 327 



Archaeopteryx, 326 



Army worm, 247 



Arthopods, 19, 20, 232 



Assimilation, 43, 77 



Auks, 327 



B 



Balanoglossus, 276 

 Barnacles, 239 

 Barriers, 376, 377 



Bats, 353 



Bees, 250 



Beetles, 245 



Bibliography, 409 



Bilateral symmetry, 186 



Biogenetic law, 390 



Birds, 1 8, 19, 317 



Birth, 105 



Black race, 371 



Blastula, 108 



Blood, 83 



Blood vessels (see Circulation) 



Bone, 118 



Books for reference, 409 



Bot-fly, 245 



Brachiopods, 193 



Brain, 64, 197, 288, 363, 364 



Branchiae, 81 



Budding, 99 



Butterflies, 247, 248 



Cabbage worm, 249 



Calendar work, 14 



Capillaries, 83 



Care of young, 103, 130, 326 



Carnivora, 355 



Cartilage, 117 



Cat family, 355 



Cells, 38, 73, 74, ?6, 87, 88 



Centiped, 255 



Cephalopods, 216 



Cerebellum, 288, 363 

 363 



Cestodes, 189 



Cerebrum, 288, 363 



Cheiroptera, 353 

 Chimpanzee, 356 

 Chlorophyll, 50 



413 



