306 



INDEX 



Continuous and discontinuous 



variations, 151. 

 Controlling sex, 189. 

 Cornevin, 229. 



Corn ration, effect on foetus, 266. 

 Cow, reproductive organs of, 29. 

 Cows, exceptional fertility of, 107. 

 Cross, the first, an improvement, 



247. 

 Cross-breeding, 243. 



a cause of variation, 248. 



advantages, 244. 



effect on breeding powers, 244. 



influences fertility, 105. 



permanent results from, 243. 



to increase fertility, 245. 



to increase size, 246. 



to restore constitution, 246. 

 Crossing and heredity, 247. 



bison and cattle, 249. 



species, 249. 



Dalrymple, 125. 

 Darbyshire, 149. 

 Darwin, 52, 72, 90, 146, 198, 210, 



221, 223, 225, 285. 

 Davenport, E., 100, 210. 

 Decreased size from early breeding 



not transmitted, 273. 

 Development, 255. 

 De Vries, 152, 302. 

 Diagnosis of contagious abortion, 



127. 



Di-hybrids, 155. 

 Disease, 179. 



acquired, 180. 



congenital, 181. 



predisposition, 181. 

 Duration of lactation, 81. 



of oestrum, 63. 



Early maturity, 283. 



pregnancy, influence on mother, 



274. 



Eckles, 122. 

 Eward, 263. 

 Ewart, 122, 168. 

 Exercise, effect on lactation, 83. 



favors fertility, 111. 

 Experiments by Mendel, 131. 



Factors affecting fertility, 100. 

 Fallopian tubes, 27. 



obstruction of, 118. 

 Fatness, excessive, unfavorable to 



fertility, 99. 

 Female reproductive organs, 24. 

 Fertility, 85. 



characters correlated with, 102. 

 confinement unfavorable, 89. 

 correlated with size, 86. 

 domestication increases, 87. 

 duration of reproductive period 



influences, 88. 

 exceptional in cattle, 107. 

 in horses, 106. 

 in poultry, 112. 

 in sheep, 110. 



frequency of recurrenpe of oes- 

 trum, 88. 

 number of mammae as related to, 



101. 



nutrition, effect of, on, 98. 

 Poland China breed, 92. 

 relation of age to, 91-93. 

 relation of gestation to, 87-88. 

 Fertilization, 33. 



changes in ovum resulting from, 



36. 



nature of, 34. 



First cross an improvement, 247. 

 Flushing ewe, 99. 

 Foetal development and heredity, 



261. 

 Foetus, size and vigor influenced by 



ration, 266. 

 Food supply, excessive, causes 



sterility, 99. 

 and body changes, 165. 

 influence of restricted, 165. 

 Free-martin, 129. 

 Function, improvement in, 281. 

 milking, 281. 



Galton, 102, 295. 

 Gametic purity, 141. 

 Gentry, 234. 

 Germ-cells, 2, 12. 



origin of, 40. 

 Germ-plasm, 161. 



origin of new characters in, 206. 



