Index 



367 



DE VRIES, action of selection, 267, 272 



fluctuations, 74, 75 



induction effects of poor soil, 246 



intra-cellular pangenesis, 206 



"mutation theory," 74, 274 



mutations, 74, 274, 279 



Oenothera mutants, 274, 278, 279- 

 282 



on nuclear control of differentia- 

 tion, 205 



pangenes, 129 



rediscovery of "Mendel's Law," 



82 



Diabetes, 118 

 DIDEROT, 214 

 Digits compared to chromosomes, 



151, 153,. 156, 161 



Differential division of Cytoplasm, 

 145, 148 



of cells, 145, 206 

 Differentiation, 31 



"correlative," 235 



definition of, 132 



due to interaction of cell parts, 

 178, 204 



measure of, 207 



nuclear control of, 204 



"self," 237 

 Dihybrid, 92, 93 

 Dimples, inheritance of, 66 

 DIONAEA, reactions of, 44 

 Diploid number of chromosomes, 156 

 Disease, inheritance of, 69 



slight resistance to, 70 

 Dislocation of organs in centrifuged 



eggs, 227, 228 

 Dispermic eggs, 183, 221 

 Divines, poor health, 252 

 Division period, 148 

 Dogs, different races, 261 



psychological characters inher- 

 ited, 70 

 DOMESTIC ANIMALS, 259 



degree of change, 259 



how produced, 264, 273 



number of species, 259 



progenitors, 259 



regressive mutants, 282 

 DOMINANCE, MODIFICATIONS OF, 106 



Blue Andalusian, 106 



echinoderm hybrids, 107 



extra toe in fowls, 107 



incomplete, 106 



in red X white Mirabilis, 87 

 nature of, 107 

 not fundamental, 107 

 plain X banded snails, 106 

 red X white cattle, 106 

 reversible, 107 

 sex-limited characters, 171 

 sex-linked characters, 185 

 white X black leghorns, 107 



Dominant characters, 84 

 "extracted," 86 

 ratio to recessive, 84, 88 

 races, 290, 291 



Double monsters, 223, 224, 229 



DRIESCH, 236 



DROSOPHILA, chromosomes of, 1 



. W, 194 

 "cross overs," 192, 193 

 modifying factors, 103 

 lethal factors, 105, 190 

 mutants, 284, 285, 286 

 rapid breeding of, 114 

 sex-linked characters, 186, 187 



DRYDEN, 71 



Duplex Factors, 98 



Duty, 319, 322 



of science, 337 



Dwarfs, true, 117 



caused by alcohol, 220 



Dynamic equilibrium, 8 



Ear, development, 23 

 EAST, heterosis, 273 274, 275 

 ECHINODERM type of egg, 202 

 ECHINUS, first cleavage, 14 

 Ectoderm, 23 

 Education and heredity, 307 



capacity for, 250 



definition, 250, 343 



good and bad, 251, 252 



habit formation, 326 



limiting activities, 251 



more potent in man, 249 



needs of, 336 



possible improvements, 343 

 Egg and sperm, 10 



hereditary inequality of, 19^ 

 Egg nucleus, 21 



Egg organization, types of, 202 

 ELSBERG, plastidules, 129 

 Emboitement, 57 

 EMBRYOGENY, 23 

 Fmbryology, experimental, 216 



