INDEX 



307 



Gestation, 66. 



causes of variation in period, 72. 



period of, 69. 

 Geyelin, 97. 

 Goodale, 23, 187. 

 Goodnight, 249. 

 Graafiaa follicles, 25. 

 Grading, 244. 

 Growth, 256. 



a cell function, 259. 



by cell division, 7. 



capacity for, 257. 



development of foetus, 260. 



effect of climate, 271. 



factors influencing, 257. 



impulse strongest in youth, 256, 

 260. 



influence of age, 271. 



influence of food supply, 257. 



influenced by early pregnancy, 

 276. 



relation of lactation to, 277. 



retarded, permanency of, 268. 



Hagadoorns, 292. 

 Hallett, 147, 301. 

 Hart, 64, 266. 

 Heape, 42, 54. 

 Heat or oestrum, 41. 



duration, 63. 



during pregnancy, 60. 



effect of ration on, 64. 



recurrence, 63. 

 Helme, 75. 

 Heredity, 131. 



and development, 132. 



and foetal development, 261. 



and sex, 183. 



and variation not antagonistic, 

 124. 



definitions, 132. 



kinds of, 134. 

 Hinny hybrid, 252. 

 Huish, 43. 

 Humphrey, 64, 266. 

 Huxley, 151. 

 Hybrids, 249. 



cattle-bison, 249. 



cattle-zebu, 253. 



hinny, 252. 



Hybrids Continued 

 mule, 170-250. 

 sheep-goat, 254. 

 zebra-horse, 253. 



Immunity, 181. 

 Improvement, 280. 



in early maturity, 283. 



in function, 281. 



in milking function, 281. 



in size, 280. 



in speed, 284. 



in tendency to lay on fat, 283. 



in wool production, 282. 

 In-breeding, 217. 



advantages claimed, 218. 



bad results from, 219. 



Berkshires, 234. 



cattle, 223. 



Darwin's researches, 231. 



decreased fertility following, 220. 



definition, 217. 



dogs, 228. 



fixing characters by, 240. 



limits of, 238. 



loss of vigor from, 220. 



mice, 231. 



pigs, 226, 234. 



prepotency of in-bred animals, 241. 



researches of Ritzema Bos, 232. 



results with different species, 242. 



selection important, 238. 



sheep, 227. 



Wistar institute experiments, 233. 

 Incubation, fowls, 74. 

 Inheritance, 131. 



alternative, 135. 



blending, 135. 



mendelian, 137. 



mosaic, 136. 



of disease, 179. 



of polled character, 144. 

 Insemination, artificial, 42. 

 Intoxication of male parent, effect 



on offspring, 49. 

 Iwanoff, 43. 



Kehrer, 75. 

 Kempster, 97. 

 Kulbs, 89. 



