XX11 LIST OF ILLUSTRATIONS. 



FIG. PAGE 



244. Frog's egg, in an early stage of development .... 726 



245. Frog's egg, in process of development . . . . . 726 



246. Frog's egg, farther advanced ...... 726 



247. Tadpole, fully developed . 727 



248. Tadpole, with limbs beginning to be formed . . . .728 



249. Perfect frog ....... 728 



250. Section of the blastoderm . . . (Foster and Balfour) 730 



251. Blastoderm, separating into laminae .... (His) 735 



252. Chick-embryo, in different stages of development . . (His) 736 



253. Egg of fish, with umbilical vesicle ..... 738 



254. Human embryo, with umbilical vesicle ..... 739 



255. Fecundated egg, showing formation of the amnion . . . 740 



256. Fecundated egg, farther advanced ..... 741 



257. Fecundated egg, with allantois nearly complete . . . 741 



258. Fecundated egg, with allantois fully formed .... 742 



259. Human embryo and envelopes ; end of first month . . . 745 



260. Human embryo and envelopes ; end of third month . . . 745 



261. Compound villosity of the chorion ..... 747 



262. Extremity of a villosity of the chorion ..... 748 



263. Uterine mucous membrane ; unimpregnated uterus . . . 750 



264. Uterine tubules ; unimpregnated uterus .... 750 



265. Impregnated uterus ; formation of decidua vera . . . 752 



266. Impregnated uterus ; formation of decidua reflexa . . . 752 



267. Impregnated uterus; egg inclosed by decidua rcflexa . . . 752 



268. Impregnated uterus ; connection of egg and decidua . . . 753 

 269-. Pregnant uterus ; formation of the placenta .... 754 



270. FcEtal pig, with its membranes ...... 755 



271. Cotyledon, from pregnant cow's uterus . . . . 756 



272. Extremity of a fcetal tuft, from human placenta . . . 757 



273. Extremity of a fcetal tuft, injected . . . . .758 



274. Diagram of the placenta, in vertical section .... 759 



275. Human embryo and its membranes ..... 763 



276. Pregnant human uterus, at the seventh month . . . 764 



277. Muscular fibres of the unimpregnated uterus . . 767 



278. Muscular fibres of the uterus, ten days after parturition . . 767 



279. Muscular fibres of the uterus, three weeks after parturition . . 768 



280. Formation of the cerebro-spinal axis . . . . . 769 



281. Formation of the cerebral vesicles ..... 770 



282. Foetal pig, showing brain and spinal cord .... 770 



283. Fcetal pig, farther advanced . . . . . .770 



284. Head of foetal pig, showing hemispheres, cerebellum, and medulla oblon- 



gata ......... 770 



285. Brain of adult pig . . . . . . .771 



286. Human embryo, one month old . . . . . . 774 



287. Formation of the alimentary canal ..... 775 



288. Foetal pig, showing umbilical hernia ..... 777 



289. Human embryo, showing development of the face . . . 781 



290. Head of human embryo, about the sixth week . . . 782 



291. Head of human embryo, at end of second month . . , 782 



292. Fcetal pig, showing Wolffian bodies ..... 784 



293. Fcetal pig, showing Wolffian bodies and kidneys . . . 785 



294. Internal organs of generation, in the fcetal pig . . . 786 



