INDEX 



607 



Diseases, malignant, 447 



mental, in urban and rural environ- 

 ments, 375 



of blood forming organs, 449 



of heart and blood vessels, 448 



of teeth, 454 



pernicious anemia, 344 



thyroid enlargement, 346 



tuberculosis, 351, 443-445 



typhoid, 366-368 



vaccination against, 438 



venereal, 445 

 Distance receptors, 1 1 1 



present dominance of, 1 18-120 

 Division of labor among cells, 191 

 Divorce, 288-290 



Ductless glands, diseases of, 451-453 

 Dutch East Indies, 563 

 Dutch-Hottentot crosses, 561 



Earth, age of, 24-29 



future of, 30, 31 

 Education, a biological necessity, 



469-471 



and civilization, 475-477 



changes in, 596 



influence of, 468-488 



influence of biology in, 474 



nature and nurture, 471-474 



obstacles to be overcome, 482-487 



of adults, 597 



of the future, 477-482 



role of science in, 464 

 Electrical forces in the cell, 194 

 Elementary schools, 480 

 Emotional life and crime, 399 

 Emotions, and their expressions, 135, 

 136 



center of in brain, 259 



efi"ect on respiration, 239 

 Endocrine diseases, 451-453 

 Energy, from intake of food, 345 



geographic distribution of, 321-325 

 Enteritis of infants, 361 

 Environment, and heredity, 572-574 



determined by cell activity, 

 2 1 5-2 1 7 



efi"ects of, 295-330 



influence of urban and rural, 348- 



internal, 225 

 mastery of, 376 



Environment, and heredity, when life 



began, 35, 41-44 

 "Equality of races," 178-180 

 Eugenics, 568-584 



and euthenics, 568 



control of, 572 



criticism of, 580 



environment and, 570 



limitations of, 582 



program of, 574 



sterilization, 577 

 Eurasians, 563 

 Evolution, climate in, 327 



conclusions regarding, 51, 89 



dominance of distance receptors, 

 1 18-120 



memory in, 128 



mental in primates, 1 15-138 



of brain, 91-114 



path of multicellularity, 584 



role of language in, 1 31-135 



social organization, 137 



societal, 139-154 



traced anatomically, 84 



traced biochemically, 35-51 

 Exercise, eff^ect on circulation, 238 

 Expectation of life, 356-359 

 Experimentation with animals, 204, 



496 



Familial, influence in disease, 505 



pride, 514 

 Family, relation of off"spring to, 146, 

 148 



size of, in diff"erent occupations, 



543-551 

 Fat, storage of, 227 

 Fathers, occupation and fertility, 



540-550 

 Feeble-mindedness, 503 

 Female acquiring male characters, 



244 _ 

 Feministic movement, 284 

 Fertility, and age, 542 



and occupation, 540-551 



diff"erential in human populations, 



539-551 

 Filtrable viruses, 37 

 Food, in cities and in the country, 



369-371 

 influence of, 331-347 

 Food poisoning, 346 

 Foresight, 124 



