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; importance of difficulty in, 222, 223; non-transference of skill acquired in one line to other lines, 213; providing proper stimuli, 226; training in motive necessary, 220; value of interest in, 223. Egg, a cell, 22. Egg-cell and sperm-cell contrasted, 29. Elderton, 179, 296. Electrotropism, 198. Ellis, 265, 301. Embryo, relation to mother, 161. Embryogeny, 36. Emerick, 251.