154 



INDEX 



Crossing of cattle, 118 



" Crossing-over," 119 



Crowing of old hens, 128 



Cruikshank, 141 



Crustacea in parasitic castration, 



129, 135 

 Cryptorchism, 19, 93 ; and sterility, 



19 

 Curd, 83 

 Cuttle-fish, 12 

 Cipithia partita, 1 1 

 Cytoplasm, 2, 8, 10, 37, 115, 



133 

 Cytoplasmic inheritance, 115 

 Cytotrophoblast, 62, 71-2 



D 



Dakin and Fordham, 9, 10 

 Darwin, 11, 119, 121, 126, 128, 

 142 



Datura, cross-sterihty in, 141 



Dawson, 136 



Debility, 94 



Decidua and decidual cells, 71-2, 



lOG ; serotina, 72 ; vera, 72 ; 



reflexa, 72 

 Deciduomata, 106 

 Deer after castration, 89 

 " Deficiency diseases," 139 

 Degeneration of follicle, 27, 29 

 Dehorning of cattle, 119 

 Determination of sex, 11, 36, 111, 



118-19, 123, 136 

 Diaphragm, 77 

 Diarrhwa, 58 

 Different sires in multiple births, 



142 

 DijBFerentiation of sex cells, 6, 7 

 Digestion, 2 

 Digits, 68 



Dimorphic gametes, 124 

 Dicecious animals, 11, 124 

 Dioestrum, 47, 105-6, 108 

 Dicestrous cycle, 50-1 

 Diplotrophoblast, 62 

 Dixon and Marshall, 109 



Dog, 28, 42, 44-5, 59, 88, 108-9, 

 141-2 ; telegonic experiments, 

 121; vasectomy on, 112; see 

 also Bitch 



Domestic animals, economic reasons 

 for castration, 90 



Dominant characters, 116, 118, 123 



Dorset Horn sheep, 49, 89 



Drake after castration, 91, 95 



Drones, 11 



Drosophila, 139-40 



Duck after ovariotomy, 95 



Duration of pregnancy, 75 



Dynamometer, 79 



Dysmenorrhoea, 52 



Dyspepsia, 59 



Dystrophia adiposogenitalis. 111 



Ear, 68 

 Eberth, 22 

 Eckhard, 38 



Ectoderm, 4, 61, 63, 69; extra- 

 embryonic, 62 

 Efferent ducts, 19 ; nerves, 38 

 Egg, 125 ; see also Ovum 

 Ejaculation, 20, 22, 38-9 

 Ejaculatory ducts, 20 

 Eland, 89 

 Elephant, 138 

 Embryo, 61, 63-4, 66-7, 73, 131, 



133^ 139, 142, 145; attachment 



of, 70 ff . 

 Embryonic area, 63, 69 ; ectoderm, 



65, 71 

 Emerson, 140 



Endocrine activities of ovary, 81 

 Endoderm, 4, 62-3, 69, 71 

 Enriqu^s, 6 

 Environment, fresh, beneficial 



results of, 6 

 Environmental conditions, 12-14, 



41, 58 ; influence of, 112, 123, 135, 



137, 139 

 Enzyme, 133, 135 

 Epidermal cells, 78 

 Epidermis, 69 



