INDEX 



447 



Brain, embryonic, 48; of primates, 



188; of vertebrates, 86 

 Branchial arches, 54 

 Branchiosioma, 145 

 Bridges, 314 



British Guiana, tinamou, 244 

 Brvophyta, 28 

 Bryozoa, 28, 132 

 BufTon, 9, 413 

 Bugs, 253 



Bull, Ephraim Wales, 344 

 Bumble bees, and red clover, 230 

 Burbank, 350 

 Bursa, seed capsule shape, 317 



Cacops, 151 



Caenogenesis, 211 



Callosities, 417 



Cambrian, 123; coelenterates, 130; 



mollusca, 133; sponges, 130; trilo- 



bites, 134 

 Camels, 184; phylogeny, 185 

 Cannabis saiim, 336 

 Carboniferous, 123; amphibia, 151 

 Carnegie, 380 



Castes, neuter, evolution of, 397 

 Castle, W. E., 318, 421 

 Casts, 125, 126 

 Cat, skull, 391 

 Catarrhini, 188 



Caterpillar, 211; mimicry of twig, 244- 

 Calocala ilia, 243 

 Cattle, 347; selection in, 351; polled 



Hereford, 404 

 Cave drawings, 1, 206, 207 

 Cebidae, 188 

 Cells, 30, 31; importance in genetics, 



272. 

 Cellulose, digestion in termites, 240 

 Cenozoic, 122 

 Cephalopoda, 37, 132; concealing 



discharges, 217, 237 

 Cercopithecidae, 188 

 Cereus giganleus, 226 

 Chamaeleon, 223 

 Change, of habits, 392; source of, 



433; adaptive and incidental, 434 

 Characters, acquired, inheritance of, 



386, 414, 415; evidence of, 417 

 Characters, organic, source of, 431; 



permanence of, 437; useful and 



harmful, 389; importance to in- 

 dividual, 387 



Chat, yellow-breasted, 394 



Cluld, 422 



('hilopoda, 136 



Chimpanzee, 189 



Chlorophyll, 91 



Choloepus didadylus, 223 



Chondrocranium, 54, 68; of elasmo- 

 branch, 58 



Chordata, 28, 37 



Chorion, 4'5; human, ^6" 



Chromomeres, 291 



Chromosomes, cliaracteristics of, 292; 

 organization of, 291; in mitosis, 

 100; in gametogenesis, 292, 293; 

 abnormal behaviour, 299; non- 

 disjunction, 300; multiplication, 

 299; in crossing over, 309; and in- 

 fertility, 349; and Mendelian in- 

 heritance, 303; in gynandromorphs, 

 333; haploid and diploid number, 

 292; and sex, 297, 298; x, y and z, 

 298; of aphids, 329, 330; of Ascaris, 

 295; of Drosophila, 291; of honey- 

 bee, 329; of man, 310, 361 



Chromosome theory, 289; evidence 

 for, 300 



Cicindelidae, cursorial adaptations 

 of, 218 



Circulation of human embryo, 48 



Circulatory system, of fishes, 59; of 

 dogfish, 61; of terrestrial verte- 

 brates, 61 



Class, 26 



Classification, 19, 25; of animals and 

 [)lants, 28 



Clavicle, of Sauriplerus, 76; of ter- 

 restrial vertebrates, 77; of prim- 

 itive reptile, 79; of mammals, 80; 

 of primates, 188 



Claws, 85; of anteaters, 232; of flesh- 

 eating birds, 233, 235; as weapons, 

 237 



Cleavage, 39; of frog's egg, 41 ; of 

 pigeon's egg, 41 



Climate, changes of, 248, 249; and 

 food supply, 250 



Climl)ing, adaptations for, 222 



Clones, 355 



Cocoanuts, dispersal by water, 260 



Codling moth, 21 



Coelenterata, 28, 130, 215 



('(K'lom, 35 



Colonial animals, 23 



