I5I4 LIFE : OUTLINES OF GENERAL BIOLOGY 



sleeplessness, 266 



snails, 59 



snakes, movement, 227 



social activities, 130 



social animals, 109, 120 



social biology, 991 



social birds, no 



social control of sex, 11 89 



social economy, 1398 



social evolution, 1107, 1109 



social habits — 



of ants, 122 



of bees, 123 

 social heritage, 991, 1301, 1305 

 social life — 



advantages of, 120, 11 60 



among animals, 11 60 

 social studies, 1387 

 society, beginnings of, 1159 

 sociolog}^ — definition and essentials, 



1 163, 1304, 1405 

 sociosphere, 646, 1240 

 sol, 13, 65 

 somatic cells, 863 



somatic modifications, 1012,1014, 1096 

 soul, 657 

 space-time, 1377 

 spatial isolation fostering new strains, 



1035 

 spawning, fortuitous, 555 

 species — 



and habitat, 1037 



definitions of, 708 



making of, 711, 713, 1036 



post-glacial, 892 



problem of, 706 



welfare and birth-rate, 802 

 specificity, 13, 14, 742 

 spectacles, need of, 1079 

 sperm-making cells, 491 

 spermatids, 724 

 spermatocytes, 724 

 spermatogenesis, 722 

 spennatozoa , of two kinds, 529 

 spermatozoon, 718, 720, et seq. 

 spiders — 



biology of, 55 



parachuting of, 56 



primitive, 1088 



threads, 56 

 spider's web, evolution of, 1087 

 spleen, 283 



"spontaneous" variations, 945 

 spore-bearing surfaces, 965 

 staining of cells. 369, 385, 401 

 starfish, 23 



statistical methods in biology, 1303, 



1450 

 storm petrel, 34 

 stream lines, 1072 

 structure — adjustment of, 1061 

 struggle for existence, 51, 1093, 1308 



and war, 13 14 

 subconscious thinking, 594 

 sublimation, 1190 

 sundews, 159 

 super-man, 1370 

 super-normal types, 1333 

 suprarenal capsules, 292, 296 

 survival of variations, 960 

 suspended animation, 272 

 sweat glands, 1257 

 sweating, 289 

 symbions, 139 

 symbiosis, 133, 135, 139, 1448 



in heather, 175 



physiological nature of, 174 

 symmetry — 



bilateral, 107 1 



radial, 669, 1071 

 sympathetic nervous system, func- 

 tioning of, 1433 



Tardevisians, 11 76 



Taungs, man of, 11 55 



taxonomy, 4 



tears, biology of, 251 



technical education, 1360 



technique of life-graphs, 141 3 



technodrama, 141 8 



tegumentary tissues, 699 



telescope eyes, 682 



temperament, 1228 



tendril-bearers, 169 



termites, inter-relations of, 207 



testes, implantation of, 465 



testicular graft, 301 



Theory, Darwinian, 1016, 1024, 1080 



Theory of Drifting Continents, 889 



theory — 



of life, 1384 



metagenesis, 784 



sex selection, criticised, 1024 



variation, 942 

 third eyelid, 921 

 thorny development, 951 

 threshold substances, 356 

 thymus gland, 686 

 thyroid deficiency, 295 

 thyroid degeneration, 294 

 thyroid gland, 18, 292, 293, 357 

 thyroxin, 292, 295 



