INDEX 



1511 



organisms — 



development of, 715 



evolution of, 846 



fermenting, 363 



first, 844 



origin of, 843 

 organs — 



classification of, 689 



correlation of, 673 



definition of, 671 



development of, 682 



functional change, 684 



rudimentary, 686 



substitution of, 683 

 origin — 



of birds, 879, 918 



of insects, 876 



of land plants, 869 



of mammals, 918 



of seeds, 873 



of specific distinctions, 964 

 osmosis, 1449 

 ovaries — removal of, 466 

 ovary, 466 



oviparous mammals, 794 

 ovum, 717 



investing^ sheaths of, 720 



maturation of, 725 



X-element in, 530 



Pain in life, 12 13 

 Palaeolithic Man, 1289 

 palaeontographical evidence for evo- 

 lution, 917. 

 palaeontological sequence, 826 

 palaeontology, 5 

 pcilaeontography, 906 

 Paleotechnic civilisation, 1352 

 palolo worm — rhythm in, 67 

 parallel-induction, 10 14 

 parasite, in two hosts, 108 

 parasites, 139 



adaptive characters of animal, 151 



damage by, 149, 150 



dependence of, 178 



eggs of, 153 



external, 136 

 parasitic animals, 90 



classification of, 141 

 parasitic males, 504 

 parasitic plants, 146, 147, 173 

 parasitic relations, variety of, 136 

 parasitism, 143, 145 



and predation, 141 



origin of, 148 



reciprocal, 139 



parenchyma, 699 

 parental care, 547, 550, 562 

 parental emotion, 548 

 parthenogenesis, 479 



artificial, 481, 1223 



casual, 480 



inducement of artificial, 482 



pathological, 480 

 partner moulds, 135 

 partner yeasts, 135 

 partnership between fungus and 

 plant root, 173 



between organisms, 133 

 pedigree of man, 11 49 

 pelagic fauna, 92 

 Pelmanism, 1373 

 perceptual inference, 594 

 perched plants, 166 

 persistence of useless structures, 925 

 persistent types of animal, 824 

 pests, 1293 



phagocytes, 289, 434, 437 

 phagocytosis, 433 

 phases of life, 1298 

 photo-catalysts, 308 

 photoptic sense, 249 

 photosynthesis, 305, 410, 1443 



artificially produced, 308 

 phylogeny, 5 



physicist, function of, 1124 

 physiology, general, 2 

 physiological evidence for evolution , 



920 

 physogastry, 127 

 pigments, 408 



blood, 412 



chlorophyll, 411 



organic, 411 



physiological status, 415 

 Piltdown man, 1151 

 Pithecanthropus erectus, 1150 

 pituitarj^ 18 



body, 292, 297 

 place-sense, 1408 

 plagues of animals, 202 

 planarian worm, 17 

 planetary life, 909 

 plant — 



breeding, 1287 



ecology, 154 



ecology, human influence in, 12S6 



nutrition, 302 



parasites, origin of, 183 



reproduction, ecology of. 184 



reserves, localisation, 966 



tissues, 698 



