LIST OF ILLUSTRATIONS. 



FIG. PAGE 



191. Area vasculosa of the embryo chick 637 



192. Egg of fish, with umbilical vesicle 639 



193. Human embryo, with umbilical vesicle 640 



194. Fecundated egg, showing formation of the amnion .... 641 



195. Fecundated egg, farther advanced . 641 



196. Fecundated egg, with allantois nearly complete .... 642 



197. Fecundated egg, with allantois fully formed 642 



198. Human embryo and envelopes ; end of first month .... 645 



199. Human embryo and envelopes; end of third month . . . 645 



200. Compound villosity of the chorion 647 



201. Extremity of a villosity of the chorion 647 



202. Uterine mucous membrane ; unimpregnated uterus .... 650 



203. Uterine tubules ; unimpregnated uterus 650 



204. Impregnated uterus ; formation -of decidua vera .... 652 



205. Impregnated uterus ; formation of decidua reflexa .... 652 



206. Impregnated uterus ; egg inclosed by decidua reflexa . . . 652 



207. Impregnated uterus ; connection of egg and decidua . . . 653 



208. Pregnant uterus ; formation of the placenta 653 



209. Extremity of a foetal tuft, from human placenta .... 657 



210. Extremity of a foetal tuft, injected 657 



211. Diagram of the placenta, in vertical section 658 



212. Human embryo and its membranes ....... 661 



213. Pregnant human uterus, at the seventh month .... 662 



214. Muscular fibres of the unimpregnated uterus 664 



215. Muscular fibres of the uterus, ten days after parturition . . . 665 



216. Muscular fibres of the uterus, three weeks after parturition . . 665 



217. Formation of the cerebro-spinal axis 667 



218. Formation of the cerebral vesicles 667 



219. Fcetal pig, showing brain and spinal cord 667 



220. Fcetal pig, farther advanced 668 



221. Head of foetal pig, showing hemispheres, cerebellum, and medulla 



oblongata . . 668 



222. Brain of adult pig 669 



223. Human embryo, one month old 671 



224. Formation of the alimentary canal 672 



225. Fcetal pig, showing umbilical hernia ...... 674 



226. Human embryo, showing development of the face .... 678 



227. Head of human embryo, about the sixth week .... 679 



228. Head of human embryo, at end of second month .... 679 



229. Fcetal pig, showing "Wolffian bodies 681 



230. Fcetal pig, showing Wolffian bodies and kidneys .... 682 



231. Internal organs of generation, in the foetal pig .... 683 



232. Internal organs of generation, in the foetal pig, farther advanced . 683 



233. Formation of tunica vaginalis testis 684 



234. Congenital inguinal hernia 685 



235. Egg of fish, showing vitelline circulation 687 



236. Diagram of the embryo, with umbilical vesicle and allantois . . 688 



237. Diagram of the embryo, showing the placental circulation . . 689 



238. Venous system, in its earliest condition 693 



239. Venous system, farther advanced 693 



240. Venous system, more fully developed 693 



241. Venous system, adult condition 694 



