122 



VERTEBRATE REPRODUCTIVE CYCLES 



Oestradiol, 62, 68 



effects on behaviour, 89 

 Oestro genie hormones, ef- 

 fects on behaviour, 89 

 in ovary, 60, 62 

 in testis, 54 

 Oestriol, 62 

 Oestrone, 62 

 Oestrous cycles, 2, 14, 67, 



68, 96 

 Oestrus, 2, 15, 68, 81, 83 

 continuous in rabbit, 18 

 Optic nerves, importance of. 



Ovary, and behaviour, 81 



effects of removal, 85 



hormones of, 62 



structure of, 57, 59, 61 

 Oviductin, in bitterling, 66 

 Ovo-testis, in hens, 85 

 Ovulation, 50, 58 



in mammals, 68, 70 



in man, 17, 70 



Palolo worm, effect of moon 



on, 2, 36 

 Peck order, 88 



effects of testosterone 

 propionate on, 89 

 Penguin, autumn breeding 



of, 5 

 Pigeons, without gonads, 84 

 Pituitary gland, hormones of, 

 46, 48 

 pathology of, 47 

 structure of, 46, 47 

 Polyoestrous mammals, 16 

 Pregnancy, duration of, 6 

 corpus luteum and, 66 

 tests for, 50 

 Primates, breeding habits of, 



16,83 

 Progesterone, 65, 69 



effects on behaviour, 90 

 Prolactin, effects on be- 

 haviour, 95 



Psychological factors in 

 reproduction, 41, 76 

 Puberty, and behaviour, 83 



Rabbit, continuous oestrus 



in, 17 

 Rain, effects of, 37 

 References to authors, 112 

 Reptiles, effects of anterior 

 pituitary hormones, 50 

 effects of emigration, 23 

 effects of light, 29 

 effects of rain, 38 

 effects of temperature, 39 

 hormones and behaviour, 



87, 88 

 tropical breeding season, 34 

 Reversal, of breeding seasons, 

 22 

 of sex, 85 



Salamanders, delayed fertil- 

 ization in, 8 

 Seasonal cycles, i, 5, 20, 71, 



Seasons, definition of, 3 

 times of breeding, i , 5 



Sex, adornment, 77 



behaviour and gonads, 81 

 behaviour and hormones, 



87 

 cycles, 4, 67, 71 

 display, 42, 77 

 drive, 81 

 reversal, 85 

 Sheep, autumn breeding of, 



31 

 Siege, effects of, 13 

 Social dominance, 88 



effects of testosterone 



propionate on, 89 

 Song, effects of testosterone 



propionate in birds, 88 

 Species mentioned, 108 

 Spermiation, 50 



