1 62 The Third and Fourth Generation 



Cleavage, 26 

 Coat color in rabbits, 89 

 Color blindness, 98 

 Corn, 60, 61; early ripening, 102 

 Cretinism, 133 



Crime, relation of, to feeble- 

 mindedness, 119 

 Cross-pollination, 32 

 Cuttings, propagation by, 84 



Daisy, Shasta, 54 



Darbishire's cross of yellow-green 



peas, 36 

 Darley Arabian, 7 

 Darwin, Charles, 10 

 Darwin, Erasmus, 10 



Darwin-Wedgewood-Galton fam- 

 ily, 10 



Deaf-mutism, r26 



Deafness, inheritance of, 126 



Determiners, 38, 39, 73, 78, 81 



de Vries, new species of evening 



primrose, 52 

 Diploid number of chromosomes, 



75 

 Disease, inheritance of, in, 119 

 Disease-resistant races, 52, 63 

 Division of cell; equation, 74; 



reduction, 74, 79 

 Dog, ancestry of, 47 

 Domestic animals, origin of, 47 

 Domestication, 48 

 Dominance, 44 

 Dominant, 36, 43, 44 



Educability of white rats, affected 



by alcohol, 116 

 Education, effects not heritable, 



112 

 Edwards family, 13 

 Edwards, Jonathan, 13, 14 

 Edwards, Richard, 15 

 Egg, 21, 22, 24, 25, 67, 72. See 



Fertilization and Cleavage 



Embryo, 23, 24 



Environment: effect of, 17, 102, 

 103, 104; direct effect on germ 

 plasm, 113. See also Acquired 

 Modification; Isolation 



Environment vs. heredity, 17 



Epilepsy, inheritance of, 151 



Equatorial plate, 70, 74 



Eugenic laboratories, 123 



Eugenics, viii, IS7 



Evolution, doctrine of, loi 



Factorial hypothesis, 88 



Factors, 86, 88, 89 



Families: large, 152; of American 

 men of science, 152; of unde- 

 sirable classes, 152 



Feeble-minded, number of, 132; 

 segregation of, 134; steriliza- 

 tion of, 120 



Feeble-mindedness, inheritance of, 

 119, 123, 128, 132 



Ferdinand of Spain, 139, J41 



Flathead Indian, head of, los 



Four-o'-clocks, 44 



Frederick the Great, 142, 143 



Frogs' eggs, deposit and develop- 

 ment of, 23 



Fruit fly, 81, 97 



Galton family pedigree, 10 



Galton laboratory, 123 



Galton, Sir Francis, 11; studies 

 of ability, 10 



Galton' s law, 58 



Genius, 140 



Genotype, gr 



Geographical isolation, 104 



Germ plasm, 117; continuity of, 

 107; directly affected by envi- 

 ronment, 113; early separation 

 of soma from, 109; unaffected 

 by soma, no 



Godolphin, Arabian, 7 



Gonorrhea, 118, 150 



