INDEX 



721 



Instinct, 104-106; is it founded on 

 habit ? 388-390 ; not founded on 

 habit, 401-403 ; not unerring, 389. 



Instinctive acts, a series of reflexes, 

 398-401 ; not uniformly performed, 

 390-394. 



Instincts, are they inherited habits ? 

 386-403 ; due to external stimuli, 

 252 ; intelligence not necessary to, 

 397, 398 ; nature of, 387, 388 ; origi- 

 nate in reflex action, 394-397 ; not 

 always adaptive, 394. 



Intelligence not necessary to compli- 

 cated acts, 397, 398. 



Internal influences affecting the race, 

 196-217. 



Intra-uterine influences, 189-191. 



Jochemke, variation in functional ac- 

 tivity of, 92, 93. 



Kangaroo, development of foot of, 60. 

 Kanthack, experiments with snake 



poison, 309. 

 Kerrick, L. H., car-load lot of graded 



steers, 603 ; on herd records, 668, 



669. 



Lamarckians, opposers of, 413; views 

 of, 413. 



Lancaster, Ray, defines thremmatol- 

 ogy* i- 



Latent characters, 474. 



Law of ancestral heredity, 194, 525- 



534- 



Law of chance, 365, 366. 



Life, material basis of, 213. 



Light, acclimatization to, 313 ; chemical 

 effects of, 240 ; effects of, upon fixa- 

 tion of carbon, 239 ; effect of, upon 

 functional activity, 241-246; effect 

 of, upon living matter, 239-254 ; effect 

 of, upon regeneration, 328 ; general 

 effects of, 251, 254; influence of, 

 upon direction of growth, 247 ; influ- 

 ence of, upon eyes of dead sharks, 

 395; influence of, upon locomotion, 

 247 ; not necessary to development 

 of color, 242 ; rigor, 244 ; specific rays 

 of, that exert effect upon growth, 245, 

 246 ; vital limits as to, 244. 



Line breeding, 610-613 ; advantages of, 

 61 1; the best system for improvement, 

 612; disadvantages of, 61 1, 612. 



Living matter, distinguished from non- 

 living, 142, 143; influence of light 

 upon, 239-254; parallelism with 

 non-living matter, 210, 211; relative 



stability and instability of, 295-346; 

 response to gravity, 236-239. 



Locality a comprehensive term, 224. 



Locomotion, direction of, due to light, 

 250. 



Loeb, experiments in chemotropism, 

 273-276; experiments in heliotro- 

 pism, 250-254; experiments in par- 

 thenogenesis, 278-282 ; experiments 

 in rhythmic contraction, 276-278; 

 observations upon Infusoria, 308. 



Longevity, 201, 202; earlier offspring 

 live longest, 502. 



Lothelier, moisture experiments, 231. 



Lovejoy, A. J., line-bred swine belong- 

 ing to, 6n, 612; on herd records, 

 670 ; on inbreeding, 625. 



Lubbock, experiments with ants, 273. 



McClung on the accessory chromosome, 



635- 



Male, maturation and reduction in, 169, 

 170. 



Male and female, comparative value of, 

 587. 



Mammae, meristic variation in, 46, 47. 



Mammary tissue, grafted on ear of 

 guinea pig, 107 ; in various parts of 

 the body, 46. 



Man, auricular appendages on, 45 ; 

 cervical fistulae in meristic variation 

 in digits of, 54, 55, 69; meristic vari- 

 ation in mammae of, 47 ; meristic 

 variation in ribs of, 40, 41 ; milk se- 

 cretion not confined to females, 107 ; 

 telegony in, 188. 



Manatee, variation in digits of, 54. 



Marks due to prenatal influences, 189- 

 191. 



Material basis of life, 213. 



Maturation and reduction, a cause of 

 variation, 163-181 ; in animals and 

 plants compared, 165; in male and 

 female compared, 164. 



Maturation in the female, 165-169. 



Mean, calculation of, 424 ; of offspring 

 not the mean of the parentage, 490 ; 

 practical use of, 425 ; probable error 

 of, 440. 



Measurements, hints on taking of, 435 ; 

 scheme of, 436. 



Meat production, variation in, 81, 82. 



Mechanism of development and differ- 

 entiation, 142-154. 



Melon, influence of locality upon, 221. 



Men, milk secretion by, 107. 



Mendel, Gregor Johann, 513. 



Mendel's experiments, 516-521. 



