INDEX

Ability: 118;
calculating, literary, musical, 120.
Able child likely to be neglected, 257.
Achondroplasy, 113.
Acquired characters, inheritance of, 121.
Adami, 164.
Adaptations, establishment of, 140.
Adaptive responses, 201.
Agassiz, 297.
Albinism, in man, 116.
Alcohol: and crime, 279;
and degeneracy, 172, 179;
and germinal tissue, 172;
a poison, 168.
Alcoholism: 101, 117, 167;
factors in, 180;
in lower animals, 173-178;
views regarding inheritance of, 169, 170, 172, 178, 179, 180.
Alkaptonuria, 117.
Allelomorph, 77.
Alpine plants, non-inheritance of acquired characters, 131.
Alternative action in behavior, 207.
Altruism, possible origin of, 220.
Ambystoma, 132.
Ameba, 23, 24.
Ancestors, number of, 4.
Ancestry: a network, 3;
dual, 6;
in royalty, 5;
pride of, as a eugenic agent, 309.
Backward child, 256.
Backwardness, importance of early determination, 256, 257.
Bardeen, 126.
Barker, 229.
Barr, 246, 247, 248.
Barrington, 179.
Bateson, 77, 82.
Bees, inheritance in, 136, 137.
Behavior: lower animals, 197;
modifiability of, 200, 204-207, 217, 219, 224, 225, 337;
not wholly established by heredity, 217, 227;
rational, 205, 206;
various forms of, possible, 207, 219.
Bell, 152.
Bezzola, 170.

Billings, 249.
Binet-Simon test, 255.
Biometry, 16.
Birthmarks, 159, 160.
Birth-rate: significance of, 302;
too low in desirable stocks, 302, 304, 305, 307.
Blastomeres, 55.
Blastophthoria, 163.
Blended inheritance, 87, 92, 93.
Blends, mistakes for, 91.
Blindness, infantile, 183.
Blistering, 113.
Body: how built up from germ, 36;
duality of, 50.
Brachydactylism, 107.
Brain: in higher animals, 213;
mechanism, maladjustments of, 230.
Branthwaite, 180, 292.
Breeding, experiments, method of, 14, 15.
Brewer, 142.
Brieux, 101.
Bronner, 266.
Brown Sequard, 132, 133.
Cabot, 183.
Cacogenic strains, 310.
Cajal, 209.
Cancer, 117, 154.
Capsella, 131.
Castle, 134.
Cataract, presenile, 112.
Cattle: horn characters, 79;
roan, 81.
Cell: a unit of structure, 20;
diagram of, 21;
structure of, 20, 30.
Cell-division: 31;
indirect (mitosis), 32;
meaning of indirect, 34.
Cell-theory, 22.
Cellular basis of heredity, 22.
Ceni, 174.
Centrosome, 31.
Cerebral cortex, not functionally homogeneous, 211.
Character: defined, 12;
dominant, 74;
recessive, 74.
Characters: contrasted, 69;
determiners of, 13, 14;
independence of, 69;
inheritable and non-inheritable, 121, 122;
more than two pairs of, 87;
new combinations of, 82, 83, 84;
separable, 69;
symbols for, 78;
two pairs of, 82.
Chauvin, 132.
Chemotropism, 198.
Childbirths, intervals between, 165.

Children of the future: ours to determine quality of, 338, 339;
and home, 338.
Cholera, 152.
Chorea: 117;
Huntington’s, 113-115, 243, 325.
Chromatin, 31.
Chromosome, 32.
Chromosomes: individuality of, 39, 48;
determiners in, 94;
in germ and body cells, 40;
Mendelian factors and, 93;
number and appearance, 34, 41;
pairs of, 40, 93, 94;
significance of, in heredity, 35, 49, 50, 51, 53, 54.
Chromotropism, 198.
Church, 242.
Cleavage, 36.
Cleft-palate, 178.
Cole, 166.
College graduates and birth-rate, 304.
Coloboma, 113.
Color-blindness, 60-62.
Conceptual thought, origin of, 206.
Conduct: importance to young of practise, 221, 223;
hereditary predisposition and, 218, 337;
responsibility for, 195.
Congenital traits, 123.
Conjugation, 25.
Consciousness, 206.
Conservation: of superior strains, 157;
human, 299, 300.
Constructive eugenics, 309.
Corneal opacity, 113.
Correns, 68.
Cortex of brain, 195, 213.
Cost, of caring for our disordered and delinquent, 257, 300.
Cretins, effects of segregating the sexes, 321.
Crime: and delinquency, 263, 287;
and feeble-mindedness, 264-270;
bearings of immigration on, 280;
classifications of, 276;
defined, 276;
heredity vs. environment in, 263;
increase in, 272;
mental disorders most frequently associated with, 279;
no specific hereditary factor for, 275.
Criminal: the born, 277;
the epileptic, 277.
Criminality, 117.
Criss-cross inheritance, 61.
Criteria for judging reproductive fitness, 304, 306.
Cytoplasm: 30;
in heredity, 51.
Daltonism, 60.
Dana, 257.
Darwin, pedigree of, 316.
Davenport, 92, 116, 231, 243, 257, 271, 273, 284, 291, 304, 312.
Davis, 185.
Deaf-mutism, 152, 153.
Death, natural, 28.
Decline of nations, 290, 300.
Defective delinquent, should prevent procreation of, 335.
Defectives: increase due to breeding, 290, 291;
natural elimination done away with among, 292;
unpardonable to let multiply, 288.
Defects: breeding out, 118, 119;
mental and nervous, 228.
Degenerate strains: 269;
not a product of surroundings, 273.
Degenerates, sterilization of married, 330.
Delinquency, causes of, 267, 274.
Delinquents not all defectives, 274.
Delinquent women and girls, many mentally defective, 265, 266.
Dendrite, 208.
De Sanctis, 256.
Determiners: 13, 77;
different producing the same character, 88, 90;
segregation of, 84.
Development: in higher organisms, 28;
suppressed, 9.
De Vries, 68.
Diabetes, 113.
Difficulty, educational value of, 222, 223.
Digital malformations, 107.
Dihybrids, 82.
Diploid number of chromosomes, 41, 43.
Disease: defined, 146;
inheritance of, 98, 148;
predisposition to, 148;
reappearance of not necessarily inheritance, 146.
Dominance: 74;
delayed, 81;
incomplete, 80, 100;
in human genealogies, 102;
in man, 99, 107.
Don Carlos, number of ancestors, 5.
Drosophila, 66.
Duplex character, 80, 99.
Dwarfing, by starvation, 130.
Dwarfs, true, 117.
East, 91.
Education: actual practise in carrying out projects important, 221;
affording opportunity for development of good traits, 226;
effects of not inherited, 142, 155;
establishing pathways through the nervous system, 210 274, 278.
Hearing, hardness of, 118.
Heart disease, 154.
Hegner, 27, 38.

Heliotropism, 198.
Helm, 109, 111.
Hemophilia, 64.
Hereditary character defined, 12.

Hereditary mingling, mosaic rather than blend, 13.
Hereditary transmission, laws of, 68.
Heredity: and environment, 295;
dual ancestry in, 6;
defined, 1;
false, 163;
human, uncertainty of records, 98;
in protozoa, 22, 23;
in insanity, importance of, 261;
in sexually reproducing forms, 7;
in unicellular forms, 22, 23;
methods of study, 14, 15;
new discoveries in, 67;
not a blend, 13;
race betterment through, 289.
Heritage, blood, 1.
Heron, 307.
Heterozygote: 80;
detection of, 80.
Hill-folk, the, 271.
Hodge, 175.
Holmes, 203.
Home, for children, 338.
Homozygote, 80.
Huntington’s chorea, 113-115, 243, 325.
Huxley, 195, 205.
Hybrids: 52;
whites and negroes, 297, 298.
Hypotrichosis, 113.
Hysteria, 117.
Ichthyosis, 65.
Ideals, importance of establishing in children, 223.
Idiots, 244.
Imbeciles, 244.
Immigrants, duty of excluding undesirable, 335.
Immigration: and mental unsoundness, 281, 282;
bearing on crime and delinquency, 280;
bearing on venereal diseases, 282;
importance of restricting, 283, 335.
Immortality: of protozoa, 23;
of the race, 3.
Immunity, artificial, not inherited, 155.
Inbreeding, in defectives, 271.
Individual, and race, 3.
Inebriate women, offspring of, 168.
Inebriety, constitutional, 180.
Infant mortality, 149.
Infection, prenatal, 147.
Inheritance: and disease, 146;
blended, 87, 93;
of tendencies, 107.
Inhibitions, 216.
Inhibitors, 79.
Insane, increase in numbers of, 233, 234.
Insanity: 117;
certain forms recessive, 243;
eugenical significance of, 234, 235, 240;
importance of early diagnosis, 259;
some forms not hereditary, 260;
types of, 239;
prevalence in the United States, 228, 229.

Insect colors, effect of temperature, 129.
Instincts: 203;
adjustable, 203;
not inherited acquirements, 144;
origin of intelligent behavior from, 203, 204.
Institutional figures misleading, 266.
Intelligence, 205, 206.
Intelligent behavior, opening up possibilities of, 204.
Ireland, 171.
Irritability, characteristics of living protoplasm, 197.
Jennings, 203, 204.
Johnson, 305.
Johnstone, 245, 319, 320, 321.
Jolly, 243.
Jordan, 4, 299.
Jukes, 270.
Kallikak family, 269, 270.
Kellicott, 314, 316.
Kellogg, 299.
Keratosis, 113.
Kidney diseases, 154.
Kirby, 187, 324.
Knox, 256.
Kraeplin, 242.
Laitinen, 174.
Language, as mental aid, 206, 207.
Lapsed intelligence, theory of, 145.
Larval stages, susceptibility of, 128.
Laws, sterilization, 323, 327, 329.
Lead-poisoning: 163;
experiments on rabbits, 163.
Lederbaur, 131.
Legal restraint of defectives limited, 331.
Lens: displaced, 113;
cataract, 112.
Leprosy, 152.
Leptinotarsa, production of variations in, 125.
Linden, Countess von, 129.
Linin, 31.
Little’s disease, 215.
Locomotor ataxia, 187.
Loeb, 62, 203.
Longevity, 120.
Lord Morton’s mare, 10.
Lorenz, 113, 114, 115.
Low birth-rate, 308.
Lowell, Judge John, 312.
Luetin test, 188.
Lunborg, 243.

MacDougal, 125.
Margaret, Mother of Criminals, 270.
Marriage: barriers to, 331;
inter-racial, 296;
medical inspection before, 191.
Mast, 203.
Maternal impressions, 159-160.
Maturation: 39, 41, 43, 44;
parallel between egg and sperm-cell, 44, 46.
Mechanical skill, 120.
Mechanism of heredity, 22, 25, 26, 28, 29, 30, 35, 37, 40-54, 94, 95.
Melancholia and crime, 279.
Memory: 120, 204;
not a complete test of normality, 268, 269.
Mendel: 68;
work on peas, 82.
Mendelian factors and chromosomes: 93;
inheritance and man, 97;
principles, rediscovery of, 68;
ratio, cause of, 71.
Mendelism, 67, 69.
Mental and nervous defects, 228.
Mental defective: defined, 255;
disproportionate increase in, 232;
numbers married, 231, 232;
inefficiency of marriage laws concerning, 315.
Mental deficiency: not always inherited, 248;
tests for, 254, 255.
Mental organization of lower vertebrates, 205.
Mental process as neural process, 195.
Mental unsoundness, 196.
Mentality, inheritance of, 19.
Mentally disordered, cost of caring for, 257, 258.
Mercier, 279.
Merriere’s disease, 117.
Metazoa, 28.
Metz, 41.
Mice, 78.
Michigan, state report on mentally defective, 234.
Migraine, 101.
Mind, relation to brain, 195.
Mitosis: 32, 33;
meaning of, 34, 37.
MjÖen, 171.
Modifiability of behavior, 200, 204, 205, 207, 217, 219, 224, 225, 337.
Mongolians, 248.
Moral responsibility, 227.
Morgan, C. Lloyd, 146, 211.
Morgan, T. H., 59, 66.
Moron, 244, 268.
Morons and crime, 268.
Mosaic, heredity a, 13.

Motherhood, safeguarding, 165.
Motive, training in, 220.
Mott, 150.
Mulattoes, 92.
Multiple sclerosis, 64, 117.
Muscular atrophy: 113;
Gower’s, 65.
Musical ability, 120.
Mutations: artificial production of, 125;
germinal, 125.
Mutilations, non-inheritance of, 134.
Myopia, 64.
Naegeli, 131.
Nam family, 271.
Natural selection partly done away with in human society, 292.
Near-sightedness, 64.
Nervous and mental diseases, 153.
Nervous organization, inheritable, 242.
Nervous response, in lower organisms, 196.
Nervous system: mainly inherited, 210, 216;
establishment of pathways in, 210;
maladjustments of, 231;
special developments in man, 213, 214, 215;
units of, 208.
Nervous systems of anthropoids, 214.
Neural pathways, not all established at birth, 217.
Neuritis optica, 65.
Neurons, 208.
Neuron theory, 208.
Neuropathic constitution, expression of, 241.
Neuropathic defects, carriers of, 253.
Neuter insects, heredity in, 136, 137.
New characters, origin of, 138.
Newman, 56.
Nicloux, 172.
Night-blindness, 65.
Nilsson-Ehle, 88, 89.
Noguchi, 186.
Nucleolus, 31.
Nucleus, structure of, 31.
Nulliplex character, 80, 100.
Obesity, 120, 154.
Offspring: from one parent only, 5;
different from either parent, 12.
OÖcyte, primary, secondary, 44.
OÖgenesis, 44.
OÖgonia, 44.
Optic nerve, atrophy of, 64.
Organs, formation of, 36.

Origin of sex cells, 12, 36.

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.