2 86 



HEREDITY AND EUGENICS 



Sinistro-dextral ratio, ^^ 



Size factors, 29, 31 



Size inheritance, 29, 30, 32, 34, 39 



in plants, S3 

 Skiagraphs, 87, 10 1 

 Skin colour, 2, 4, 213, 224 



and hormones, 212, 213, 



217 

 inheritance of, 51, 52, 58, 



64, 228, 229 

 of primitive man, 6^ 

 diseases in negroes, 235 

 secretions, 224 

 Slye, Maude, 140 

 Social dominance of white man, 



215 

 ladder, 250 



organization of early man, 



226 



Soudan, 43 



Spanish in crosses, 230 



Sparrows, albino, 68 



Species, interfertility of, 224 



Spermatogenesis, human, 20, 21, 



22, 158 

 Spleen, enlarged, 128 

 Split hand and foot, y6, 78 

 Sports, 175 



Spotting of skin, 58, 59, 63, 66, 67, 

 68,69 

 inheritance of, 69 

 Spread of culture, 227 

 Squinting. See Strabismus 

 Squirrels, albino, 68 

 Stability of savage populations, 



227 

 Stammering, inheritance of, 141 

 Standard of living. 242, 243 

 Standley, Paul C, 69 

 Stannus, H. S., 58, 59, 71 

 Stanton, H. M., 171 

 Starfish, twin embryos in, 178 

 Stark, 140 



State Eugenics Board, 162 

 Stature, 224 



and hormones, 212, 217 

 inheritance of, 25, 27, 40, 41, 



43 

 of brachydactyls, 82 



of twins, 187, 189, 190 

 Sterility in free-martin, 201 



in mankind, 196 



interspecific, 224 

 Sternalis muscle, 193 

 Stieve, H., 92 

 Still-births, 230 

 St. John, Harold, 36 

 Stockard. C. R., 4, 176, 177 

 Stone Age, 225 



Storer, Rev. John, 70 

 Strabismus, 115, 120, 130 

 Stratification of society, 221 

 Striping of flowers, 50, 58 

 Stuckey, H. P., 109 

 Stuttering, 74 

 St. Vitus' Dance, 156 

 Subpituitary face, 220 

 Suetonius, 97 

 Sulcus intertragicus, 26 

 Sullivan, L. R., 180 

 Sumner, F. B., 6, 33 

 Supernumerary, breasts, 102, 129 



phalanx on thumbs, 92 

 Sweden, deaf-mutes in, 106 



myoclonus epilepsy in, 108, 

 158 



racial crossing in, 231 

 Swedes, stature of ,30 

 Swingle, W. W., 1 32 

 Symmetry in armadillo quad- 

 ruplets, 181 

 Syndactyly, 76 ,92, 93, 94, 98,99, 



100, loi, 126 

 Syphilis, 153 



Tahiti, 228 

 Taillessness, 126 

 Tallness, inheritance of, 7 

 Tamias, albino, 68 

 Tansley, A. G., 165 

 Tarpany horse, ^y 

 Tastes in twins, 189 

 Tatusia novemcincta, i jj 

 Taurae, 201 



Teeth, early decay of, 124 

 Telangiectasis, multiple heredi- 

 tary, 127 

 Temperamental differences, 142, 



143, 210, 248 

 Temperaments, 142, 162, 219, 236, 



in animals, 165 

 Tendency to perform certain 



tricks, 148 

 Tetraploid chromosome numbers, 



21 

 Tetraploidy, 42 



Texas, 21, 99, 115, 135, 176, 177 

 Thadani, K. T., 71 

 Thalassophilia, 164 

 Thessaly, 71 

 Thorndike, 198 



Thumb joint, peculiarity in twins, 

 190 



missing, 95 

 Thyroid, 142 



and baldness, 25 



and race, 211, 212, 213, 215 



