INDEX 



Accessory sexual structures, 



development of, 55 

 Adornment, sexual import- 

 ance of, 77 

 Adrenal cortex, effects on 



behaviour, 84, 86 

 Adrenal cortical hormone, 65 

 Aggressiveness, effect of 

 testosterone propion- 

 ate on, 88, 89 

 Amphibians, effects of an- 

 terior pituitary hor- 

 mones on, 50 

 effects of emigration, 23 

 effects of light, 29 

 effects of rain, 38 

 effects of temperature, 39 

 sex reversal in, 86 

 Androgenic hormones, ef- 

 fects on behaviour, 87 

 in ovary, 64 

 in testis, 52, 53 

 Anoestrus, 16 



Anterior pituitary gland, 

 hormones of, 48 

 pathology' of, 47 

 seasonal changes in, 71 

 structure of, 46, 47 

 Anterior pituitary hormones, 

 48 

 effects on behaviour, 87 

 prolactin, 95 

 Anterior-pituitary-like- 

 hormone, 50 

 Artificial light, effects of, 25, 



32, 74. 91 

 Autumn, breeding in, 31 

 migration in, 93 



Bat, delayed fertilization in, 7 

 seasonal breeding in 

 tropics, 34 



Behaviour, and gonads, 81 

 and hormones, 87, 89, 90, 



95 

 effects of castration on, 80, 



83 



effects of ovary removal 

 on, 85 



sexual, 80 

 Birds, colonial nesting in, 42 



effects of anterior pituitary 

 hormones, 48, 50, 59 



effects of castration, 83 



effects of emigration, 21, 23 



effects of gonads on be- 

 haviour, 82 



effects of hormones on 

 behaviour, 88 



effects of light, 25 



effects of moon, 37 



effects of ovary removal, 85 



effects of rain, 37 



migration, 26, 91 



peck order in, 88 



psychological factors in, 41 



sex reversal in, 86 



tropical breeding season, 35 

 Birth, season of, 6 

 Bitterling, cyclic egg-laying 



in, 15 

 function of corpora lutea 

 in, 66 

 Blindness, effects of, 29 

 Brain lesions, effects of, 76 

 Breeding, continuous, 12, 16 



cycles, I, 5, 14 

 Breeding season, definition 

 of, 3 

 time of , 1 , 5 



Canary, testosterone pro- 

 pionate and behaviour 

 of, 88 



