Harelip, 178. Hart, 266, 319, 326. Healy, 256, 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.