Education, a response to suggestion, 65; importance of, to the child, 77-78; of the subnormal and the backward, 237. Edwards, Jonathan, view held by, of punishment as vengeance, 17-19. Emerson, R. W., on non-obedience to law, 114. Emotions, factor of, in human action, 46-55; lack of satisfaction of, in American scheme of things, 55. England, system of justice in, 281. Environment, man the product of heredity and, 34-36; relation of heredity and, 37-40; adjustment of, to heredity, 41-43, 277-278; relation of, to development of criminal, 57-69; effects of, 201-202; necessity of improving, shown by studies of the Jukes and the Kallikaks, 244-249. Experts, medical, in courts, 143-149. Factory system, growth of cities due to, 76; and crime, 203-212; Fear, emotion of, in man, 46-47; instilling of, an object of punishment, 165. Feeble-minded, distinguishing between the normal and, 185-188. _See_ Defectives. Feuds, family, 12. Flight, instinct of, in man, 46-47. Folk-ways, crime defined as violation of, 6-7; enforcement of, by primitive man, 8; present-day laws descended from, 28; are still a guide to man, 99-100. Forgers, development of, 66-68. Freedom of speech, loss of, as result of World War, 220. Gang, the boy's, 79. Genius, a frequent indication of insanity, 239. Girls, protected life of, as compared with boys, 72; sex crimes among, 90-91. Glands, the ductless, and their use, 33-34, 38, 174. Grant, General, on repealing of bad law, 130. Grasset, Joseph, "The Semi-Insane and the Semi-Responsible," cited, 239. Gregariousness, instinct of, in man, 47-48, 50. Hatred, punishment actuated by, 12-19; killings traceable to, 83. Heredity, view of man as the product of environment and, 34-36; relation of environment and, 37-40; problem of future, to adjust environment to, 41-43, 277-278; responsibility of, for the criminal, 57-65; child criminal as result of, 78-79; accounting for accused men's actions by, 126-129; effects of, 201-202; laws of, not sufficiently known to justify sterilization, 237-238. Homicide, the crime of, 81-87. Ignorance, disease due to, 252. Illinois, operation of parole law in, 267 Incest, crime of, 89-90. Indeterminate sentence, the, 268-271, 278. Industrialism and crime, 76, 203-212. Insane, restraint of, a measure of self-protection, 26; treatment of, 144; in prisons, 184-185; allowances for, in criminal codes, 187-190; legal tests of, not logical or humane, 190-192. Instinct, human action largely governed by, 44-54; stress placed on, as motive power of life, 81-83. Intelligence tests, use of, 185-186. Intolerance, a persisting source of evil, 228-229. Isolation of the subnormal, 233-249.