720 



INDF.X 



elders, 353 ; not acquired characters, 

 358-360. 



Harris, B. F., example of longevity, 89. 



Heape, experiments on rabbits, 190. 



Heart, rhythmic contraction of, 398, 399. 



Heat, acclimatization to, 311-313, 379- 

 381 ; effect of, upon animal activi- 

 ties, 255 ; effect of, upon direction of 

 growth, 259; effect of, upon growth 

 of animals, 258, 259; effect of, upon 

 growth of plants, 255-257. 



Hedgehog, meristic variation in verte- 

 brae of, 39. 



Heliotropism, 247 ; conditions that de- 

 termine, 254 ; due to the luminous 

 rays, 248; general principles govern- 

 ing, 251, 254; of amoeba, 253, 254; 

 of insects, 104. 



Henking on the accessory chromosome, 



35- 

 rbst, 



Herst, experments n regeneration, 

 328. 



Herd, management of, during depres- 

 sion in prices, 665, 666 ; records of, 

 666-670 ; unity of, 662 ; without a 

 head, 664. 



Heredity, 473-547 ; coefficient of, 486, 

 488 ; coefficients of different rela- 

 tionships, 488 ; famous grandsires, 

 556 ; law of ancestral, 525-534 ; man- 

 ner of, 420-431 ; material basis of, 

 209; mathematical nature of, 510; 

 mean of offspring not mean of the 

 parents, 490; measure of, 486; mis- 

 conceptions of, 473 offspring differ 

 from parents, 482, 483 ; offspring 

 more mediocre than the parents, 

 484-486 ; origin of the exceptional 

 individual, 499, 500; progression in, 

 492-498 ; proper conceptions of, 473 ; 

 special case of correlation, 707 ; statis- 

 tical methods in study of, 426, 478 ; 

 what is transmitted? 511. 



Hero, the inbred morning-glory, 622. 



Herringham, studies on nerves, 43. 



Homoeosis, 37 ; in insects, 43 ; in verte- 

 brae and ribs, 40-42. 



Honeybee, eyes united, 65. 



Hopkins, experiments in corn breeding, 

 83-86, 493-498. 



Horns, meristic variation in, 52, 53, 66 ; 

 regeneration of, 326. 



Horse, begging instinct in, 353 ; causes 

 of evolution of, 302-304; defective 

 voice in, 353 ; development of foot 

 of, 58, 59 ; evolution of, 298-305 ; 

 extreme age of, 89; meristic varia- 

 tion in digits of, 60, 61. 



Horses, acclimatization of, 375 ; corre- 

 lation between color, sex, and speed, 

 468-471; inbreeding in, 624; power 

 of transmission among, 408 ; telegony 

 in, 185. 



Horseshoe kidney, 65. 



Hot springs, Infusoria in, 311; life in, 



379- 



Houghton, Abel, originator of goose- 

 berry, 130. 



Hunter, experiments in grafting, 107. 



Huntington, Randolph, on breeding, 

 624. 



Hybrids, character of descendants of, 

 514-521; Mendel's law of, 513-525; 

 sterility of, 607. 



Hypertrophy, 288, 289. 



Idants, 173. 



Ideals in selection, 578, 579. 



Idioplasm, 1 52, 208. 



Ids, 146, 208' 



Illinois station, system of planting at,646. 



Immunity, natural and acquired, 382. 



Improvement, upper limits of, 582. 



Inbreeding, 613-626; advantages of, 

 614, 615; A. J. Lovejoy on, 625; 

 among animals, 624-626; Darwin's 

 experiments on, 618-624 ; disadvan- 

 tages of, 615; forms of, 613, 614; 

 how to practice, 626; often more 

 vigorous than outbreeding, 622-624 ; 

 lack of vigor and low fertility com- 

 mon defects, 616, 617 ; N. H. Gentry 

 on, 625 ; not all inbred individuals 

 inferior, 620-623 ; not necessarily dis- 

 astrous, 616-626; Randolph Hunt- 

 ington on, 624; special dangers in, 

 616; total effects of, 619, 620. 



Individual, the, 352; possesses all the 

 characters of the race, 357, 360. 



Individuality in offspring from same 

 parents, 503. 



Infertility, a common defect, 616, 617 ; 

 effect of, 584, 589. 



Inheritance, complex, 527; belated, 

 475; blended and exclusive, 475; 

 from separate ancestors, 527 ; from 

 the race, 193, 194; not limited to sex, 

 474 ; of acquired characters, 292, 349; 

 offspring more mediocre than the 

 parents, 484-486; particulate, 476; 

 progression in, 492-498. 



Inoculation, immunity by, 382. 



Insect poisons, 270. 



Instability, of living matter, illustrated 

 by origin of differentiated tissue, 336- 

 338 ; of protoplasm, 398. 



