INDEX 



157 



"Heat," 42, 45, 40, 50, 101, 104, 



108, 113 ; cause of, 101 ; see also 



(Estrus, Rut 

 Hedgehog, 17, 20, 41, 101; after 



castration, 88-93 

 Heifer, 105 

 Hen, ovaries after sex reversal, 128 ; 



see also Cock, Fowl, etc. 

 Herdwick ram, normal and 



castrated, 88, 89-93 

 Hereditary characteristics, 37, 115, 



117 

 Heredity and sex, 115 ff. 

 Hereford cattle, 1 18 

 Hermaphroditism, 11, 124, 127-8, 



134 ; experimental, 130 

 Heterozygous conditions, 118, 125- 



6, 140 

 HiKMET and Regnault, 88 

 Higher animals, fertilisation in, 12 ; 



hermaphroditism m, 124 ; repro- 

 ductive organs in, 15 If. 

 Higher forms of life, composition of, 



2 ; derived from single cell, 2 ; 



reproduction by budding, 3, 5 

 Higher mammals (placental), 70 

 Hill and O'Donoghue, 50, 104, 



109 

 Hip bone, 15 

 His, 66-9 



Homosexuality, 94, 128 

 Homozygous conditions, 118, 123, 



125-6, 139-40 

 Hopkins, 20 



Hormone production, 135 

 Hormones, 92-4, 101, 130-35; of 



testis, 92-113 ; quantitative 



relatione, 135 ; seat of production^ 



of, 93-4 

 Hormonic intersexuality, 134 

 Horns, of staghorn beetle, 127 ; 



after castration, 88, 89, 93 

 Horn-sheath, after castration, 89 

 Horny style in penis of guinea-pig, 



25," 130 

 Horses, 128, 142 ; after castration, 



90, 93 ; telegonic experiments, 



121 



Host, in parasitic castration, 129 

 Hunter, 143 

 Huxley, Julian, 128-9 

 Huxley, T. H., 149 

 Hybrids, 116 ; sterility of, 141 

 Hybridisation (Mendel's experi- 

 ments), 116 

 Hydra, 3, 4 

 Hymen, 33, 39, 77 

 Hyoid arch, 67-8 

 Hj^percTemia of uterus, 51, 53 

 Hyperlactation, 84 

 Hypernephroma, 128 

 Hyperpituitarism, 111 

 Hysteria in menopause, 59 

 Hysterectomy, 98 



" Identical " twins, 131 



Ihac arteries, 73 



Ilium, 15 



Impotence, 94, 144 



Inachus, 129 



Inbreeding, 11, 123 ; eflfects of, 6, 

 11, 139-41 



Infection,' 121 



Inguinal canal, 16, 18 



Inherited fertility, 142 



Infusoria, 5 



Injection experiments, 92-3, 99 



Inner cell mass, 61 



Insectivora, 17, 41 



Insects, 133-4 ; effect of warmth 

 or cold in, 13 ; intersexuality in, 

 129 ; parasitic castration in, 

 135 ; removal of gonads in, 87, 

 98 



Insemination, artificial, 143 



Integument, 22 



Internal secretions of reproductive 

 organs, 87; of testis, 91, 113; 

 of ovar3^ 94, 113; general con- 

 clusions, 113 



Intersexuality, 127-30, 132, 134, 

 135 



