308 



INDEX 



Lactation, 80. 



duration, 81. 



effect of exercise on, 83. 



habit, 82. 



heredity, 82. 



influence of climate, 83. 



mare mule that secretes milk, 83. 



OBstrum, 59. 



relation of food supply to, 82. 



unusual lactation, 83. 

 Lambs, birth weight of, 262. 

 Langer, 31. - 

 Law, 68, 117, 124. 



of ancestral heredity, 295. 



of dominance, 139. 



of segregation, 139. 

 Lead poisoning, effect on male germ- 

 cells, 50. 

 Lillie, 47. 

 Lock, 133. 



Lord Morton mare, 167. 

 Lovejoy, 59, 236. 



McCollum, 64, 266. 

 MacFadyean, 124. 

 Male reproductive organs, 19. 

 Males, milk secretion by, 28. 

 Mammae, number as related to fer- 



.tility, 101. 

 Mammary glands, 28, 81. 



milk secretion by males, 28. 



milk secretion in, 31. 



structure of, 30. 

 Mare, genital organs, 26. / 

 Marshall, 47, 53, 56, 96. 

 Maturation' of ovum, 13. 

 Mendel, 136, 137, 138. 

 Mendelian method, 303. 

 Metaphase in cell division, 10. 

 Miles, 200. 

 Milk, 80. 



analysis of milk from mare mule, 

 82. 



secretion by males, 28. 



secretion in mammary glands, 31. 

 Mironoff, 42. 

 Monohybrids, 155. 

 Monsees^ 72. 

 Morgan, 184, 194. 

 Mule hybrid, 250. 



Mule hybrid Continued 



and telegony, 170. 



mare secreting milk, 84. 

 Mutation theory, 154. 

 Mutilations, 207. 



Nabours, 253. 



Nathusius, 72. 



Nature and nurture, 159. 



Nucleoli, 6. 



Nucleus, 5. 



Number of young at a birth, 85. 



Nutrition influences fertility, 98. 



(Estrum, 41, 55. 



correlated with ovulation, 42. 



duration of, 63. 



effect of ration on, 64. 



influenced by lactation, 59. 



recurrence of, 63. 

 Origin of germ-cells, 46. 

 Ovaries, 24. 



removal of, 23. 

 Oviparous animals, 18. 

 Ovum, 13. 



fertilization of, 33. 



Parturition, 75. 



mal-presentation, 77. 



normal, in domestic animals, 76, 



78. 

 treatment for mal-presentations, 



79. 



Pearl, 96, 97, 103, 108. 

 Pearson, 103. 

 Pedigree, 294. 

 Penycuik experiments, 168. 

 Poultry, age influences fertility, 94. 

 Practice of breeding, 280. 

 Pregnancy, early influence on 



mother, 274. 

 heat during, 60. 

 indications of, 66. 

 physical examination for, 68. 

 Pregnant swine, high calcium 



rations for, 264. 

 Presence and absence hypothesis, 



148. 



Previous impregnation, influence of, 

 174. 



