INDEX 



531 



serious, 426-428 

 slight, 426 

 Eugenics, 410-440 



contributory, 428-431 

 declining birthrate, 431-440 

 definition of, 413 

 ideals, 412-419 

 negative,- 419-433 

 only hope, 449 

 positive, 423-428 

 Problems in, 49S 



EUTHENICS, 352 



Evolution, control of, 403, 404 

 experimental, 305, 395 

 progressive, 400 

 promotion of, 403, 488, 491 

 requires new characters, 



388, 394, 395 

 retrogressive, 400 



EvoLTTTioN OP Man, 396-403 

 contemporary, 398 

 control of, 403, 404 

 future, 399, 400, 413 

 intelligence in, 403, 

 natural selection in, 403 

 prehistoric, 398 



Exogastrula, SSi 



Experience, factor in behavior, 

 464 

 learning by, 65, 465 



Experimental medicine, 5 



ExPERiMENTAi. Study of Isr- 

 HEBITANCE, 332, 224 



Eyes, development, 38 

 color, 197, 291 

 lacking, 325 

 fused together, 325 



Facial features, inheritance of, 

 197 

 German type, 391 

 Hapsburg type, 291 

 Jewish type, 391 

 Factors op development, 79-86 

 Factors, added in progressive 

 mutations, 394 



chemical comparisons, 394, 

 395 



definition of, 101 



differential, 364 



distribution in maturation 

 and fertilization, S6Z 



dominant and recessive, not 

 modified by union, 343 



drop out in regressive mu- 

 tations, 394 



extrinsic and intrinsic, 85 



for color developers, 256 

 of rabbits and mice, 359, 

 of sweet peas, 356, 257, 



for pigment, 356 



location in cell, 261, SSS, 

 ^6S, 364 



Mendelian, 364, 265 



multiple, 381-387 



nature of, 260 



no formation de novo, 395 



origin of new, 394, 395 



relations to characters, 255, 

 256 



sex determining, 365 

 Fahlenbeck, noble families of 



Sweden, 436 

 Faraday, 474 



Fat stains, effects on next gen- 

 eration, 350 

 "Fate of part function of po- 

 sition," 333 



of organization, 334 

 Fecundity, inherited, 204 

 Feeble-mindedness, 305, 306, 295 

 Feminist movement, 484 

 Fertility, of lower types, 411 

 Fertilization, 15, 16, 107-110 



heterogeneous, 313 

 "Fewer and better children," 



439 

 Fischer, mutations of insects, 



348, 497 

 Fluctuations, 311, 212, 389 

 Food, influence on development 



in tadpoles, canaries, bees, 



326, 327 



