520 



INDEX 



DOMINANCE, MODIFICATIONS OF, 



265 



Blue Andalusian, 266 

 echinoderm hybrids, 268 

 extra toe in fowls, 26T 

 in red x white Mirabilis, 



265 



nature of, 278 

 not fundamental, 279 

 plain x banded snails, 266 

 red X white cattle, 266 

 sex-limited characters, 270 

 sex-linked characters, 270- 



278 

 white X black leghorns, 267 



Dominant characters, 227 

 "extracted," 230 

 ratio to recessive, 233 



DONCASTER, 494 



Double monsters, 315, 316, 322, | 

 328 



DRIESCH, 333, 494 



DROSOPHILA, rapid breeding of, 



290 



sex-linked characters, 166, 

 271, 272, 273, 275 



DRYDEN, 206 



Duplex Characters, 249 



Duty, 443, 459 

 of science, 480 



Dwarfs, true, 293, 294 

 caused by alcohol, 312 



Dynamic equilibrium, 10 



Ear, development, 28 



EAST, heterozygosis, 384, 385, 

 386, 497 



ECHINODERM type of egg, 178 



Ectoderm, 25, 27, 28 



Education, and heredity, 428 i 

 definition, 354 

 good and bad, 354, 356, 357 

 habit formation, 457 

 limiting activities, 356, 357 

 more potent in man, 354 

 needs of 475 

 possible improvements, 489 



Egg and sperm, hereditary in- 

 equality of, 176 



Egg nucleus, 16, 24 



Egg organization, types of, 

 178 



ELLIS, 494 



ELSBERG, plastidules, 100 



Emboitment, 81 



EMBRYOGENY, 26 



Embryology, experimental, 307 



Embryonic differentiation, pro- 

 cesses in, 179 



Embryos, double, 315, 316, 322, 



323 



dwarf, 315 



half and three quarter, 317, 

 319 



Endoderm, 25, 27, 28 



"Energies of Men," 472 



ENGELMANN, 49 



English sparrow in U. S. 432 



Engrammes, 348 



Environment, acting at sensi- 

 tive period, 375 

 definition, 307 

 direct action on germ cells, 



351, 348 



and education, 360 

 good and bad, 355, 356, 357, 



475, 476 

 influence in producing new 



races, 375, 376 

 influence on ontogeny, 303, 



305 

 influence on phylogeny, 302, 



305 



possible improvements, 489 

 social institutions and, 304 



Epidermolysis, 293 



Epigenesis, 81, 83, 161, 180, 452 



Epilepsy, 205, 206, 295 



Equality of Man, 303, 448 



ETHICAL OBLIGATION, 484 



Ethics, 491 



Eugenicist, methods of, 416 



Eugenical rules as to defects, 

 recessive, 421, 422 



