I5I2 LIFE : OUTLINES OF GENERAL BIOLOGY 



plants — 



and animals, contrasts, 848 



climbing, 167 



growing point in, 459 



insectivorous, 157 



life-histories of, 773 



movements of, 321 



origin of land, 869 

 play— 



and education, 810 



criteria of, 808 



in animals, 808 

 pleasure in life, 12 13 

 poisons, classified, 443 

 polar contrasts, 103 

 polito-drama, 1419 

 pollination, 187 



by insects, 189 



by water, 189 



by wind, 188 



cross, 190, 192, 193 

 pollinators, birds as, 205 

 pol^-embryony, 528 

 polygamy — 



permanent, 559 



seasonal, 559 

 polymorphism, 114 

 population — 



law, 1271 



increase, 1269 



problems of, 1268 



world's maximum, 1270 

 position of women, 565 

 post-glacial species, 892 

 potato beetles, 50 

 practical education, 1345 

 predation, parasitism and, 141 

 preferential mating, 1024, 1026 

 pre-history survey, 1394 

 probable error, 105 1 

 Pfocellaria pelagic a, 34 

 procession caterpillars, 112 

 progress discussed, 11 12 

 prophetic researches, 1224 

 proportions of the sexes, 525 

 prosenchyma, 699 

 protective adjustment, 1062 

 protein, 11, 13, 14, 29 

 protoplasm, 367 



as psychoplasm, 406 



constitution of, 369, 404 

 Protozoa, 856, 939 



reactions in, 634 



tentative behaviour, 635 



trial and error in, 635 

 protozoology, 1220 



psychic inter-relations, 1432 

 psycho-biological concepts, 1298 

 psycho-biosis, 1409 

 psychology, educational, 1234 

 public appreciation of biology, 1350 

 pulse — 



of evolution, 975 



of life, 908 

 purposive behaviour, 26 



Quest of food, 275 



Racial evolution, 1105 



teaching of, 586 

 race-continuance, 871 

 rational conduct, 593 

 reasoning, 598 

 recapitulation doctrine, 740 

 recessive characters, 193, 1447 

 recurrent glacial periods, 903 

 reflex actions — 



automatised, 632 



chain of, 995 



diagrams of, 630 



in plants, 161, 327 

 reflex arc, 633 

 reflexes, 239 



conditioned, 633 



in birds, chains of, 519 



unconditioned, 633 

 regeneration, 23, 1061 



in plants, 756 



of lost parts, 754 



organic, 753 

 regenerative capacity, 755, 806 

 regulative system, 288 

 regrowth, 753 

 rejuvenescence, 1223 ^ 

 relativity, 1376 



and biology, 1380 



in sociology, 1381 

 religion, origin, 1423 

 re-peopling of Britain after ice-age, 



1057 

 reproduction, 450 



adaptations in, 460 



and death, 462 



and hormones, 464 



as discontinuous growth, 456 



asexual, 20 



beginnings of, 859 



modes of, 451 



problems of, 467 



plant, ecology of, 184 



rate of, 462 

 reproductive activity, rhjrthm in, 460 



