INDEX 



1503 



birds (continued) — 



flight, 34 



flight distance, 71 



flying height, 71 



instinct, 73 



intelligence, 600 



migration, problems of, 72 



origin of, 879 



residents and migrants, 70 



speed, 71 



toothed, 882 

 birth-control, 1276 

 birth-rate changes, 1269 

 bittern, 884 

 bladderworts, 164 

 blinding in cave animals, 997 

 blood, 14 



circulation, 281 



clotting of, 347 



functions of, 281 



gases transported in, 347 



humoral function of, 673 



salinity, 349 



tests, 335 

 blubber, 95 

 bodily modifications, transmission of, 



982 

 body-mind, 1243, 1409 

 body-surface — effects of, 867 

 body temperatures, 358 

 Boy Scout movement, 1453 

 bracken, 209 

 brain-eye, 682 



brain, relative increase, 1084 

 brains — beginnings of, 868 

 breeding towards ideal types, 1334 

 "Brownian movement" in cells, 369 

 burrowing, 1038 

 butterwort, 158 

 buzzard, 28 



Carnivores — 



large, 1291 



small, 1291 

 carnivorous plants, 163 

 carrier-pigeons, 75 



castration, experiments in, 493, 1028 

 cat — 



behaviour, 644 



colour-blind, 644 



tone deaf, 644 

 cataleptic immobility, 263 

 cat's eyes, 250 

 causation, 1461 

 cave animals, 997 

 cavities in plant and animal, 866 



cell- 

 chemical processes, 386 



chemistry, 398, 527 



cycle, 857, 1229 



damage, 387, 10 11 



division, 21 



environment of, 391, 522, 532 



growth, 735 



growth in vitro, 402 



inclusions, 375 



instability, 22 



life, duration of, 403 



materials, 382, 385 



membrane, 393 



microcosm of, 703 



nucleus, 373, 703 



nucleus, division of, 860 



pressure of, 390 



processes, 405 



puncturing experiments, 747 



rhythm, 399 



staining of, 369, 385, 401 



structure, 366 



theory, 701 



treatment, effects of, 369 



types, 376, 705 

 cells — 



irritability of, 379 



sperm, 491 



surface and volume, relations, 457 

 cellular immortality, 861 

 cenozoic period, 841 

 centrosome, 374 

 Ceratodus, 27 

 chain of reflex actions, 995 

 change of function, 968 

 characters — non-heritable, 10 19 

 chase, animals of the, 1290 

 chemical synthesis, 1 104 

 childhood, 1263 

 chlorophyll, 306 

 choice of mate, 1025 

 chromatophores, 850 

 chromolipoids, 415 

 chromosome arrangement, 374, 375 

 chromosomes, number of, 1449 

 chrysalids, 63 

 circulation of matter, 107 

 cilia, 233 

 cities, 1233 

 classes of animals, 935 

 cleavage of the egg, 1443 

 climate, change of, 1052 

 climatic adaptations, 1048 

 climatic influence on germ plasm, 



1005 



