758 



SUBJECT INDEX 



Ve&perugo, formation of corpus luteum in, ] 



142, 145 ; retention of ovum in follicle 



of, 151 



Vesperugo noctvla, see Bat 

 Vicia, chromosomes of, 206 

 Villi, structure and function of, 396 sqq. ; 



core of, 398 

 Virgin, mammary tissue of, 617 ; explana- ! 



tion of lactation by, ib. 

 Vitality of gametes, 220 

 Vital staining, of placenta, 465 sq. ; \ 



with trypan blue, ib. ; in rabbit, ib. ; 



with pyrrol blue, 466 ; in mouse, ib. ; 



in guinea-pig, ib. ; in rat, ib. ; in cat, 



ib. ; with Indian ink, ib. 

 Vitamins, 529 sq. 

 Vitellin, 281 sq., 286, 293 ; composition 



of, 288 



Vitelline membrane, 184 

 Yitellolutein in eggs of Maja squinado, 294 

 Vitellorubin in egg of Maja squinado, 294 

 Vocal cords, growth of, 713 

 Vole, see Arvicola glareolus 

 " Vollplacenta," 409 

 Vulva, 74 ; innervation of, 560 



W 



Walrus, cestrous cycle in, 45, 54 ; period 



of gestation in, 45, 55 ; lactation period 



in, 55 



Wapiti deer, cestrous cycle in, 45 

 Water-buck, cestrous cycle in, 45 

 Water shrew, cestrous cycle in, 55 

 Water-soluble vitamin B, experimental 



importance of, 529 sq. 

 Weasel, cestrous cycle in, 53 sq. 

 Weather, influence of, on milk, 59(5 

 " Wellenbewung " hypothesis, 61 sq. 

 Whale, periodicity of breeding in, 29 ; 



cnstrous cycle in, 47 ; breeding season 



in, ib. sq. 



Whey albumen in milk, 594 

 White of egg, composition of, 277 sq. : 



glucoprotein in, 287 ; ovamucoid in, 



ib. ; ovalbumen in, ib. ; conalbumen 



in, ib. ; " Tata-eggwhite," ib. 

 Wild cat, cestrous cycle in, 52 ; period of 



gestation in, ib. ; breeding season in, 



ih. 



Wild-duck, fertility in, 628 

 " Witch's milk," 595, tiir, 

 Wolf, breeding season in, 4 ; cestrous 



cycle in, 50 ; period of gestation in, 6. 

 Wolffian body, 114 

 Woodchuck, interstitial cells in testis of, 



163 ; testes of, 331 

 ' Work of development," 285 

 Wrasse, see Ctenolabrus 

 WZ type of sex -determination, 678 



Xanthine, 307 



Xanthophyll, 281 



X-chromosome in Lygceus bicrucis, 673 



" Xenia," 208 



Xenia hicksoni, breeding season in, 8 



Xenopus, breeding season in, 19 sq. 



Xenopus Icevis, breeding season in, 19 



X-rays, effect of, on germ - cells, 209 ; 



sterility due to, 645 sq. 

 XY type of sex-determination, 674 



Yak, cestrous cycle in, 45. See also Bibos 

 grunnicus 



Y-chromosome in Li/gceiM bientcif, 673 



Yew, abortion caused by, 652 



Yohimbine as cure for impotence, 638 ; 

 effect of, on genital organs, 638 sq. 



Yolk of egg, composition of, 277 sq. ; 

 colour of, 283 ; palmitic acid in, ib. ; 

 oleic acid in, ib. stearic acid in, ib. ; 

 lecithin in, ib. ; lutsin in, ib. 



Yolk-sac, Chapter X., Part 3 ; origin 

 of, 411 ; of Sauropsida, ib. ; somatic 

 stalk of, 415 ; of Lacertilia, ib. ; in 

 sheep, ib. ; in Seps chakides, ib. ; in 

 man, ib. ; nutritive importance of, 

 415 sqq. ; in opossum, 415 ; in rabbit, 

 415, 422; of Marsupialia, 416; nutri- 

 tive importance of, in Ungulaia, 420 ; 

 in horse, ib. ; in cow, ib. ; in pig, ib. ; 

 in sheep, ib. ; in Carnivora, i6. ; in 

 dog, 421 ; in elephant, ib. ; in Probos- 

 cidea, ib. ; in Hyrax, ib. ; in Rodentia, 

 ib. sqq. ; in mouse, 422 sq. ; in rat, 

 422 ; in Acomys caharinus, 423 ; 

 in hedgehog, 424 ; in shrew, ib. ; in 

 Insectivora, ib. sq. in mole, ib. ; 

 in Tupaia javanica, ib. ; in bat, 425 ; 

 connecting stalk of, ib. ; in monkey, ib. ; 

 in Primates, ib. sq. 491 ; in man, ib. 



Yolk-spherules, 291 



Yolk-villi, 424 



Zebra, sterility of hybrid, with horse, 642 



Zebu, see Bos indicus 



" Zellsaiilen," 396 ; of man, 500 sq. 



" Zenker's crystals," 299 



Zoarces, formation of corpus luteum in, 



145 

 Zona pellucida, 121, 404, 405 sq. ; of 



hedgehog, 476 



Zoua radiata, 121. See also Corona radiata 

 Zonary placenta, 408, 442 

 Zonary villi of ovum, 445 



