Ability, heredity of, 146, 147.
heredity and pedigrees of, 176-181.
Acquired characteristics, relation of, to heredity, 199-207.
Adaptedness, 200-202.
Albinism, and order of birth, 125, 126.
heredity of, 142.
Alcoholism, heritable effects of, 203-207.
American Breeders' Association, 15, 196.
Andalusian fowl, heredity of color in, 81-83.
Angio-neurotic oedema, pedigree of, 168, 170.
Aristotle, 18.
Bagatelle board, to illustrate variability, 58-60.
Bateson, William, 81, 100.
Bentley, Madison, quoted, 19.
Biffen, R. H., 133.
Biology, and Sociology, 8, 35-45.
eugenic applications of, 38-40, 49 et seq.
Biometric Laboratory, 14.
Bio-Sociology, 8.
Birth rate, and social status, 116-123.
decreasing, in England, 122.
Boies, abstract of Winship's data of Edwards family, 187, 188.
Booth, classification of London population, 70.
Brachydactylism, heredity of, 142.
pedigree of, 150-153.
Cataract, heredity of, 143.
pedigree of, 157, 159.
Cephalic index, heredity of, 140, 144.
Chance, law of, 56-58.
Child labor laws, effect of, 211, 212.
Chorea, Huntington's, heredity of, 143.
pedigree of, 160, 165.
Church, influence and opportunities of, 231.
Civic worth, variability of, 70.
Coefficient of correlation, 110, 111.

Coefficient of correlation between birth rate and social status, 117.
positive and negative, 111-113.
significance of, 111.
Coefficient of heredity, 109.
human, 140.
Coefficient of variability, 62, 63.
human, 69.
Color blindness, heredity of, 142.
Connecticut, vasectomy statute of, 220-222.
Conservation of human protoplasm, 136.
Correlation, 103, 104.
coefficient of, 110, 111.
social status and birth rate, 116-123.
Cousin marriage, regulation of, 154, 155.
Criminality, and order of birth, 125, 126.
increase in, 29.
Darwin, pedigree of, 181, 183.
quoted, 6, 184.
Data, need for and collection of, 192.
Davenport, quoted, 192-195.
Deaf, United States census of, 34.
Deaf and dumb, United States census of, 34.
Deaf-mutism, heredity of, 143.
Deaf-mutism, pedigree of, 160, 167.
Defect, and order of birth, 123-126.
Defectives, number of, in Great Britain, 31.
United States census of, 34.
Dependents, United States census of, 34.
Determiners, absence of, 143.
in germ, 54.
in Mendelian heredity, 88-95.
Development of the individual, 51.
as a form of reaction, 52, 53.
Die Familie Zero, 184-187.
Differential fertility, 113-121.
Dominance, in Mendelian heredity, 84.
irregular and incomplete, 87.
Dominant characteristics, 85.
Drapers' Company, 14.
Dugdale, account of "Jukes" family, 182-184.
quoted, 236, 237.
Education, 20, 71.
heritable effects of, 200.
Edwards, Jonathan, descendants of, 187, 188.
Elderton, quoted, 209-211.
Employer's liability laws, effects of, 211.

England, falling birth rate in, 122.
number of defectives in, 31, 32.
Environment, effects of, 197-207.
Eugenics, aims of, 5, 42-45, 114, 123.
as a factor in religion, 239, 240.
definition of, 3.
encouragement of ideals of, 234-240.
history of, 10-13.
objections to, 191.
practice of, 215-234.
program of, 189-240.
Eugenics Committee of American Breeders' Association, 15, 196.
Eugenics Education Society, 14.
Eugenics Laboratory, 14.
Eugenics Record Office, 15.
Eugenics Review, 14.
External conditions, effects of, 199-203.
Eye color, heredity of, 140, 142, 143.
Fabian Society, 122.
Familie Zero, 184-187.
Family histories. See Pedigrees.
Feeble-minded, in Great Britain, 32.
in United States, 34.
Feeble-mindedness, pedigree of, 162-169.
Fellows of the Royal Society, mental heredity in, 145, 146.
Fertility, and social status, 116-123.
differential (selective), 113, 121.
in normal and pathological stocks, 115.
of various classes, 120, 121.
Fluctuation, 56.
Forearm, heredity in length of, 140.
Fowl, color heredity in Andalusian, 81-83.
Functional modification, non-inheritance of, 199-207.
Galton, Sir Francis, illustrations of variability, 58, 63.
in history of Eugenics, 9-13.
on mental heredity, 144-146.
pedigree of, 181-183.
quoted, 5, 44, 45, 236, 239, 240.
Gametic coupling, 100.
Germ, relation of, to adult structure, 50.
Germ cells, relation of, to Mendel's law, 88-94.
Goddard, account of feeble-minded family, 162-169.

Great Britain, number of defectives, etc., 31, 32.
Greece, 9, 10.
Guinea-pig, heredity of color in, 84-87.
HÆmophilia, heredity of, 143.
Hair color and curliness, heredity of, 140, 142.
Harrow, mental heredity in students of, 147.
Head measurements, heredity of, 140.
Heredity, coefficient of, 109, 140.
definition of, 77.
human, 137-188.
Mendelian formula of, 80-102.
in human traits, 142.
need for studies in, 212, 213.
of acquired characters (modifications), 199-207.
psychic characters, 143-147.
relation of, to Eugenics, 78, 79.
statistical formula of, 80, 102-113.
Heron, David, birth rate, and net fertility of social classes, 116, 119-121.
Homicides, number of, in United States, 30.
Huntington's chorea, heredity of, 143.
pedigree of, 160, 165.
Idiots, statistics of, 32.
Imbeciles, statistics of, 32.
Imbecility, heredity of, 143.
Immunity, relation of, to heredity of disease, 168-173.
Index of variability, 62.
Indiana, vasectomy statute of, 218, 219.
Infection, heredity of, diseases and defects due to, 168-173.
Infertility, pedigree of, 174, 175.
Inheritance. See Heredity.
Insane, statistics of, 31-34.
Insanity, and order of birth, 124-126.
associated with alcoholism, 205, 206.
Internationale Gesellschaft fÜr Rassen-Hygiene, 230.
Jennings, 66.
Johannsen, 66.
Jordan, David Starr, quoted, 209.
JÖrger, Die Familie Zero, 184-187.
"Jukes" family, 182-184.
Keratosis, heredity of, 142.
Lankester, Sir E. Ray, "Kingdom of Man," 21-24.
quoted, 7.

L'Elite, 10.
Lobster claw, heredity of, 155.
pedigree of, 155, 157.
London, number of children in, 122.
university of, 14.
Man's place in Nature, 6, 7.
Marriage, antecedents to, 238, 239.
restrictions in, 228-232.
Mediocrity, 61.
Mendel, Gregor, 83, 84.
Mendelian formula of heredity, 80-102.
Mendelism and eugenic practice, 97, 233.
Mendel's law, and unit characters, 95-99.
characteristics inherited according to, 98, 99.
human, 142, 143.
complications of, 100.
present limitations of, 100-102.
Mental ability, pedigrees of, 176-181.
Mental defect, heredity of, 147, 160, 165, 162-169.
Mental traits, heredity of, 143-147.
Models, illustrating variability and variation, 59, 63-64.
Murders, number of, 30.
Mutation, 63-66.
National Association of British and Irish Millers, 133.
Natural selection, 21-23, 45.
Nettleship, pedigree of night blindness, 158-163.
Night blindness, heredity of, 143.
pedigrees of, 157, 158, 161, 163.
Normal frequency curve, 56-60.
Nurture, 17, 76.
Œdema, pedigree of angio-neurotic, 168-170.
Ohio Institution for the Feeble-Minded, superintendent quoted, 33.
Oneida community, 10.
Ontogeny, 51.
OÖphorectomy (oÖphorotomy), 218-222.
Order of birth and pathological defect, 123-126.
Oxford, mental heredity in graduates of, 146, 147.
Paupers, United States census of, 34.
Pearson, Karl, 14, 27, 36.
heredity in school children, 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)

4. Other than the corrections listed above, printer's inconsistencies in spelling, punctuation, hyphenation, and ligature usage have been retained.