n the eugenic program, and need for, 196-215.

Restrictions in marriage, 154, 155, 230, 231.

Royal Society, mental heredity in Fellows of, 145, 146.

School children, heredity in, 143, 144.

Schuster, on mental heredity, 146, 147.

Scottish Commission, statistics of insane, 31.

Selective fertility, 113-122.

Sex limited heredity, 100.

Size of family, 114, 115.
and relative proportion of defectives, 126.

Social practices, investigation of, 207-212.
opposed to Eugenics, 227, 228.

Social status, and birth rate, 116-123.

Social variation, 75.

Society for social and racial hygiene (Munich), 230.

Sociological Society, 12.

Sociology, aims of, 35, 42.
and Biology, 8, 35-45.

Span, heredity of, 140.

Species, relation of, to pure line, 66.

Split hand. _See_ Lobster claw.

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 surrou