Index 1 



349 



on nuclear control of differentia- 

 tion, 199 



pangenes, 129 



rediscovery of "Mendel's Law," 



81 



Diabetes, 117 

 Digits compared to chromosomes, 



151, 154, 155, 160 



Differential division of Cytoplasm, 

 145, 148 



of cells, 145, 200 

 Differeiatiation, 31 



"correlative," 225 



definition of, 132 



due to interaction of cell parts, 

 176, 199 



measure of, 201 



nuclear control of, 199 



"self," 225 

 Dihybrid, 91, 92 

 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, 219 



Dispermic eggs, 213 

 Divines, poor health, 239 

 Division period, 148 

 Dogs, different races, 249 



psychological characters inher- 

 ited, 70 

 DOMESTIC ANIMALS, 247 



degree of change, 247 



how produced, 251 



number of species, 247 



progenitors, 247 



regressive mutants, 261, 268 

 DOMINANCE, MODIFICATIONS OF, 105 



Blue Andalusian, 105 



echinoderm hybrids, io5 



extra toe in fowls, 106 



incomplete, 105 



in red X white Mirabilis, 86 



nature of, 106 



not fundamental, 106 



pla ; n X banded snails, 105 



red X white cattle, 105 



reversible, 106 



sex-limited characters, 168 



sex-linked characters, 182 



white X black leghorns, 106 

 Dominant characters, 83 



"extracted," 85 



ratio to recessive, 83, 87 



races, 274, 275 



Double monsters, 214, 215, 220 

 DRIESCH, 226 



DROSOPHILA, chromosomes of, 186, 

 189 



"cross overs," 187 



modifying factors, 102 



lethal factors, 104, 185 



rapid breeding of, 115 



sex-linked characters, 180, 181 

 DRYDEN, 71 



Duplex Characters, 97 

 Duty, 301, 309 



of science, 319 

 Dwarfs, true, 117 



caused by alcohol, 212 

 Dynamic equilibrium, 8 



Ear, development, 23 



EAST, heterozygosis, 261, 264, 265 



ECHINODERM type of egg, 196 



ECHINUS, first cleavage, 14 



Ectoderm, 23 



Education, and heredity, 290 



capacity for, 238 



definition, 238, 325 



good and bad, 239, 240 



habit formation, 308 



limiting activities, 239 



more potent in man, 237 



needs of, 317 



possible infprovements, 325 

 Egg and sperm, 10 



hereditary inequality of, 197 

 Egg nucleus, 21 



Egg organization, types of, 196 

 ELSBERG, plastidules, 129 

 Emboitment, 57 

 EMBRYOGENY, 23 

 Embryology, experimental, 208 

 Embryonic differentiation, processes 



in, 108 

 Embryos., double, 214, 215, 220 



dwarf, 214 



half and three quarter, 216, 217 

 Endoderm, 23 

 ENDOGENESIS AND EPIGENESIS, 58 



