INDEX 



293 



Schjelderup-Ebbe, T., 176, 



184, 185, 189, 191 



Science in general, 15, 20, 90 



Selection, 120, 125, 210, 228 



Sex, 47; origin, 84; relation 



to social dominance, 191, 



194; division of labor, 247, 



251 



Shaftesbury, third Earl of, 24 



Shaw, Gretchen, 92 

 Shoemaker, H. H., 185, 191, 



193 

 Social, origins, 29, 244, 272, 

 274; inertia, 43, 44; appe- 

 tite, 44, 47; facilitation, 134, 

 172; hierarchy, 175, 207 

 Sociology, general, 200 

 Spermatozoa, mass protection, 



68; length of life, 83 

 Springbok, 108 

 Starfish, brittle, 44 

 Statistical probability, 54 

 Struggle for existence, 26, 51, 



210, 242 

 Sully, 236 



Survival value, 32, 49, 133, 

 173, 244; of breeding col- 

 ony, 111; of social hier- 

 archy, 207 



Tadpoles, effect of numbers 

 on regeneration, 98 



Temperature, mass protec- 

 tion from, 58; effect on 

 growth of mice, 102 



Termites, 32, 48, 261, 264, 

 265, 271 



Territory, bird, 135; a factor 

 in social rank, 193 



Toleration, 43, 44 



Trial-and-error, 44 



Tropism, 246. {See Forced 

 movements) 



Tsetse fly, minimal popula- 

 tion, 108 



Ultra-violet, mass protection 



from, 59 

 Undercrowding, 50; harmful 



effects, 52; effect on growth, 



91 



Vetulani, T., 99 



War, 210 



Wasps, 262, 264, 265; solitary, 

 46; importance of females, 



259 

 Welty, J. C, 92, 136, 159 

 Wheeler, W. M:, 29, 40, 246, 



259, 262, 264 

 Wheeling of bird flocks, 198 

 Wilder, Janet, 59 

 World Court, 238 

 Wright, Sewall, 117, 240 



