536 



INDEX 



Dispermic eggs, 321 



Divines, poor health, 366 



Division period, 134 



Dogs, different races, 376 



psychological characters in- 

 herited, 210 



Domestic Animals, 375-382 

 degree of change, 376 

 how produced, 383 

 number of species, 375 

 progenitors, 375, 376 

 regressive mutants, 402 



Dominance, modifications of, 

 • 271 



Blue Andalusian 272 

 echinoderm hybirds, 274 

 extra toe in fowls, 274 

 in red X white Mirabilis, 



271 

 nature of, 285 

 not fundamental, 285 

 plain X banded snails, 273 

 red X white cattle, 272 

 sex-limited characters, 274 

 sex-linked characters, 277- 



285 

 white X black leghorns, 273 



Dominant characters, 233 

 "extracted," 236 

 ratio to recessive, 239 

 races, 412, 414 



DONCASTER, 510 



Double monsters, 323, 324, 331 

 Driesch, 341, 510 

 Drosophila, rapid breeding of, 

 299 



sex-linked characters, 172, 

 377-281 

 Dryden, 212 



Duplex Characters, 255, 256 

 Duty, 459, 475 



of science, 496 

 Dwarfs, true, 302 



caused by alcohol, 320 

 Dynamic equilibrium, 10 



Ear, development, 31 



East, heterozygosis, 396, 398, 



399, 182 

 Echinoderm type of egg, 182 

 Echinus, first cleavage, 22 

 Ectoderm, 24, 25, 30, 31 

 Education, and heredity, 444 



definition, 363 



good arid bad, 363, 365, 

 366 



habit formation, 473 



limiting activities, 365, 366 



more potent in man, 363 



needs of 491 



possible improvements, 505 

 Egg and sperm, hereditary in- 

 equality of, 184 

 Egg nucleus, 17, 23 

 Egg organization, types of, 



182 

 Elsberg, plastidules, 106 

 Emboitment, 86, 406 

 Embryology, 30 

 Embryology, experimental, 315 

 Embryonic differentiation, pro- 

 cesses in, 186 

 Embryos, double, 323, 316, 

 330, 331 



dwarf, 323 



half and three quarter, 325, 

 327 

 Endoderm, 24, 25, 30, 31 

 Endogenesis and Epigenesis, 88 

 "Energies of Men," 488 

 Englemann, 52 



English sparrow in U. S., 448 

 Engrammes, 356 

 Environment, acting at sensi- 

 tive period, 383 



definition, 315 



direct action on germ cells, 

 356, 359, 360 



and education, 369 



good and bad, 364, 365, 366, 

 491 492 



