l62 



INDEX 



Penis, 20, 24, 25, 32, 38, 130; 



section of, 22 ; in testicular 



graft, 92 ; in injection experi- 

 ments, 92 

 Perineum, 25, 33, 77 

 Peristaltic waves, 20 

 Peritoneal cavity, 66 

 Peritoneal lining of uterus, 31 

 Peritoneum, grafting to, 91-2 ; 



injection, 93 

 Periodicity, 12, 13, 14; effect of 



warmth or cold on, 13 ; lunar, 



13 ; in mammals, 14 

 Peters, 71 



P^ZARD, 90-1, 93, 95-6, 130 

 Phagocytes, 83 

 Pheasant, 126, 134 

 Phosphates in milk, 83 

 Phospho-protein, 20 

 Phosphorus in protoplasm, 1 

 Physico-chemical fertilisation, 10 

 Pick, 128 

 Pig, 59, 60, 128, 142 ; testes of, 93 ; 



see also Sow 

 Pigeons, mating habits, 128 

 Pigmentation of nipples, 74, 83 ; 



of forehead at pregnancy, 75 

 Pituitary gland, 81, 109, 114; 



extract of, 109 ; disease of, 87 

 Placenta, 62, 72-3, 78, 85, 106-7, 



132 ; selective action of, 132 

 Placental mammals, 70 

 Plant louse, parthenogenesis in, 10 

 Plants, 12 

 Plasma, 83 

 Plastids, 115 

 Ploss, 57 

 Plumage of birds after castration, 



91 

 Polar bodies, 9, 36-7, 60 

 Poll, 134 

 Pollen, 12 



Polychtet worms, 13 

 Polygamous animals, balance of 



sexes, 126 

 Polymorph, 44 

 Polyiestrous animals, 42, 45, 48-51, 



104, 108, 113 



Poly(estrum, 49 

 Polyp, 3, 10 

 "Polyploidy," 115, 141 

 Population, 146 ff. ; population 



problems, 148-9 

 Post-(t'strous uterine hypertrophy, 



105 

 Potassium in milk, 83 

 POTTHURST, 57 



Pouch-like outgrowth in gemma- 

 tion, 3 

 Pouch (marsupials), 49, 70 

 Poultry, inherited fertility of, 142 ; 



see also Cock, Hen, Fowl 

 Pregnancy, 42-5, 60, 74-5, 77, 101, 

 113; duration of, 75; maternal 

 impressions, 122 

 Premenstrual congestion, 52, 57 

 " Prepotency," 123 

 Prepuce, 24, 33, 128 

 Presentation, 77, 79 ; breech, 80 

 Primates, menstrual cycle in, 51 ; 

 oestrus in, 55 ; yolk sac in, 

 62 

 Primitive groove, 64 

 Primitive streak, 63-4 

 Primordial follicles, 25 

 Prolapsus uteri, 81 

 Pronucleus, 9 

 Pro-oestrum, 42, 45, 50,. 54-6, 



108 

 Pro-(estrous degeneration, 53 

 Propagation, rate of, 146 ; undue, 



148 

 Prostate gland, 20, 38, 41, 88, 92-3, 



113, 128; atrophy of, 87-8 

 Prostatic plexus, 24 

 Prostatic secretion, 20-2 

 Proteins, 1, 21, 26, 34, 83 

 Protophj^ta, 2 

 Protoplasm, 1, 2, 7, 8, 37, 62; 



how made up, 1 

 Protoplasmic mass, 1 

 Protozoa, 2, 5, 6, 11, 12, 123-4 

 Pseudopodium (amceba), 2 

 Pseuclo -pregnancy, 42-5, 47, 50, 

 51, 53, 101-2,' 104, 106-9, 113; 

 corpus luteum in, 43 



