Smallpox,152.Social maladies, prevention of,293.Softening of the brain,186.Soma,28.Spermatid,43.Spermatocyte, primary, secondary,43.Spermatogenesis,42.Spermatogonium,43.Spermatazoon:26,40;a cell,22;formation of,43;structure of,43.Spindle, in cell-division,32.Spottedness of hair-coat,113.Sprague,281,305.Starfish, training a,204.Statistical methods,15.Statistics, trustworthy needed,334.Stature, inheritance of,17.Stereotropism,198.Sterility,182.Sterilization:322;in epilepsy,326;laws,323;laws, on trial,329;laws, states having,327.Stevens,41.Stockard,174-178.Strength, muscular,120.Stripes, reversionary,8.Stutzman,305.Sullivan,168.Superior strains, conservation of,157.Synapse,210.Synapsis,41,42.Syndactyly,65,108,111.Syphilis:184-190;and prostitutes,185;cerebro-spinal form,189-190;prenuptial inspection for,190-192;prevalence,186;stages of,185;tests for,188.Syphilitics: children of,187,188;married,190.Tabes dorsalis,186.Taints,101.Talent, inheritance of,212.Taylor,297.Telegony, alleged cases of,10.Temperament, inheritance of,19.Thermotropism,198.Thigmotropism,198.Third generation, segregation in,69.Thomsen’s disease,118.Thomson,55.Thorndike,296.Tower,125.Training of children: and heredity,218;faults in,221,222.Transmission, not necessarily inheritance,163.Tredgold,170.Treponema pallidum,185.Tribe of Ishmael,271.Tropic responses: often purposeful,201;uncertainties in,202.Tropisms:197;complications in,200;in plants and animals,198;relations to reflex actions and instincts,203.Tschermak,68.Tuberculosis,118,148-160,162.Twins: identical,55;sex of,55.Typhoid,152.Unemployed, frequently morons,280.Unfit, elimination of, urgent,313.Unit-character:12;inheritance of,13.Unicellular organisms:21;inheritance in,22,23.Use and disuse,122.Van Ingen,167.Vasectomy,322.Venereal disease,182.Virchow,147.Voison,133.Volitions as tropisms,199.Volvox,25,26,27.War, eugenical effects of,299.Wasserman, provocative,189.Wasserman test,188,189.Webbed digits,65.Weeks,251,252,253,291.West,167.Wheat,75,81,88.Whetham,314,316.Whitman,145.Wilmarth,243,245,274,291.Wilson,59,62,94,95.Woods,296.X-element,57,58.Zebra hybrids,10.Zeros, the,271.Zygote:26,27;chromosomes of,40.