Sports, 65. Standard deviation, 62. Statistical formula of heredity, 80, 81, 102-113. Stature, heredity of, 140. of mothers, 56, 57. Sterilization, eugenic value of, 222-225. statutes permitting, 218-223. "Studies in National Deterioration," 14. Symbols used in pedigrees, 149. Syndactylism, heredity of, 142. Theognis, 3. Thomson, 40. "Treasury of Human Inheritance," 196. symbols used by, 148-150. Tredgold, quoted, 224, 225. Tuberculosis, and order of birth, 124, 125. associated with alcoholism, 204. pedigree of pulmonary, 168, 171. Typhoid fever, eradication of, 223. Unit characters, 53. list of, 98, 99. Unit characters, relation of, to Mendel's law, 95-99. United States Census Reports, statistics of defectives, etc., 28-34. University of London, 14. Variability, 56-63. measure (coefficient) of, 61-63. of human traits, 69, 70. Variation, 55-70. and modification, 75. application of, in Eugenics, 70-77. distinguished from variability, 63, 64. Vasectomy, 218-225. Connecticut statute permitting, 220-222. Indiana statute permitting, 218, 219. Wallace, Alfred Russell, 6. Warbasse, quoted, 195. Webb, Sidney, 122. Wheat, new varieties of, 133, 134. Whetham, quoted, 35, 74, 75, 229, 237-239, 240. Winship, data regarding Edwards family, 187, 188. Woods, heredity in royalty, 145. _Zero, Die Familie_, 184-187. TRANSCRIBER'S NOTES 1. Passages in italics are surrounded by _underscores_. 2. Illustration captions are indicated by =caption=. 3. Images and tables have been moved from the middle of a paragraph to the closest paragraph break. 4. Figure 17 is missing from the scanned pages even though there is no break in the continuity of page numbers. 5. The word oedema uses an oe ligature in the original. 6. The following misprints have been corrected: "stattistical" corrected to "statistical" (page 81) Removed stray bracket in "second parent)" (page 93) Added period at end of abbreviation "N.S.W" (page 115) "conditons" corrected to "conditions" (page 245) 7. Other than the corrections listed above, printer's inconsistencies in spelling, punctuation, hyphenation, and ligature usage have been retained.