SUBJECT INDEX 



1569 



Nest-building (cont.) 

 rabbit (cont.) 

 thyroid and, 1307-1308 

 withdrawal of progesterone and, 1308 

 rat 



adrenalectomy and, 1308 

 and heat regulation, 1346 

 environmental temperature and, 1309 

 experience and, 1337 

 gonadectomy and, 1308 

 hvpophvsectomy and, 1307 

 thyroid" and, 1307, 1346 

 ring dove 



estrogen and, 1276, 1293 

 role of sexes, 1275 

 rodents, hair growth and, 1347 

 sparrow, presence of male and, 1279 

 species differences, 1352 



Xanthocephalus, external environment and, 1280 

 Nesting material 



and gonadotrophin secretion in birds, 1280-1281 

 and progesterone secretion in birds, 1281 

 Nests, birds, types, 1269, 1270 

 Neurofibromatosis, chromosome idiogram, 65 

 Neurohypophyseal hormones, 224-229 

 cellular origin, 226-229 

 chemical nature, 227 

 vasopressin: oxytocin ratio, 228 

 Neurohypophyseal secretion, 223-227 

 Neurohypophysis 

 electron microscopy, 227-228 

 histology, 223-225 



oxytocin content, suckling and, 623 

 Neurosecretion, 225-228 



birds, transport of material, 1099 

 chemical characterization, 169 

 fowl, during breeding cycle, 1145 

 rate, 229 



the secretory granules, 227-228 

 Nicarbazin, and inhibition of egg production in 



fowl, 1108 

 Nitabuch's membrane in placenta, 942 

 Nitrogen balance 



during pregnancy in rat, 692 

 placenta and, 690 

 Norepinephrine in semen, 389 

 Notonecta glauca, sperm, 709, 751 

 Notropis, hermaphroditism, 1063 

 Nucifraga columbiana 



incubation patch, 1287-1288 

 nest -bull ding 

 role of sexes, 1271 



temporal relation to egg-laying, 1273 

 Nuclear cluoniatin, 55 



use ill idciitilication of genetic sex, 55, 1112 

 Nucleoside j)h()sphorylase in seminal vesicles, 392 

 Nuptial coloration, Rana, orchiectomy and, 1045 

 Nuptial pads 

 Discoglossus 



androgen and, 1046 

 orchiectomy and, 1044-1045 

 Rana, androgen and, 1046 

 Nursing behavior, 1321 



guinea pig, mammary distension and, 1348 



mammary distension and, 1330-1331 



rat 



experience and, 1339 

 hvi)()})hvsectomy and, 1331 

 synipathcctoiny and, 1331, 1348 

 Nursing suckling relationship, 1321 

 Nutritional deficiencies (see Dietary deficiencies) 

 5'-Nucleoti<lase in semen, 391 

 Xycteris hiteola 



estrus, postpartum, 458 



Nycteris luteola (cont.) 



ovarian follicular growth during pregnancy, 458 

 prostate, 374 

 female, 368, 374 

 Nycticorax nycticorax 

 altricial young, 1298 



feminine behavior by female, androgen and, 1 196 

 incubation behavior 



presence of eggs and, 1294 

 testosterone and, 1292 

 incubation behavior and broodiness, inter- 

 changeability, 1303 

 incubation by males, 1286 

 masculine behavior by female, androgen and 



1197 

 nest-building, gonadal hormones and, 1275 

 oviduct, androgen and, 1125 

 submissive behavior, estrogen and, 1256 

 Nymphomania (see also Mating behavior, mascu- 

 line behavior by female) 

 cattle, adrenal cortical androgen and, 1191-1192 



Ochotona princeps, fertilization, supernumerary 



sperm, 844 

 Odocoileus hemionus 

 breeding season, 502 

 hypophyseal gonadotrophins 

 pregnancy and, 261 

 seasonal fluctuations, 259 

 Odocoileus virginianus (see Deer, Virginia) 

 Odontogadus, breeding season, 1069 

 Oedipus, ovoviviparity, 1056 

 Olfactory perception, man 

 cyclic changes, 1348 

 gonadal hormones and, 1208, 1398 

 Oligospermia in man, vitamin A and, 681 

 Oncorhynchus, hermaphroditism, 1063 

 Oncorhynchus gorbuscha, sex dimorphism 

 dorsal hump, 1042 

 head, 1042 

 Oncorhynchus nerka, sex dimorphism 

 dorsal hump, 1042 

 elongated jaw, 1042 

 thickened skin, 1042 

 Ondatra zibethica 

 breeding season, 502 

 estrus, postpartum, 458 



ovarian follicular growth during pregnancy, 458 

 reflex ovulation, 499 



reproduction, population density and, 1262 

 Oogenesis 



birds, inherent cycles, 1141 

 congenital defects in mouse, 802, 804 

 estrogen and, 451 

 fowl, 1115 



luteinizing hormone and meiotic divisions 

 1115 

 independence of follicle-stimulating hormone, 



243, 245 

 neonatal, 806 



nondisjunction and Mongolism, 63-64 

 prenatal, 802-805 

 Opossum 



absence of Miillerian duct in males, 113 

 aggressive behavior by female, reproductive 



state and, 1256 

 bulbovestibular glands, homologues of Cow- 



per's glands, 369 

 developing ovum 

 cleavage rate, 846 

 tul)al transport time, 846 

 gonad transformation, experimental, 100, 105- 

 110 



