XXVlll LIST OF ILLUSTRATIONS. 



FIG. PAGE 



236. Formation of cerebro-spinal axis ... . 638 



237. Fo3tal pig, showing brain and spinal cord .... 638 



238. Foetal pig, showing brain and spinal cord .... 639 



239. Head of foetal pig . . . . . . .639 



240. Brain of adult pig . . . . . .639 



241. Formation of alimentary canal ...... 645 



242. Foetal pig, showing umbilical hernia ..... 646 



243. Head of human embryo, at twenty days . . From Longet 652 



244. Head of human embryo, at end of sixth week .... 652 



245. Head of human embryo, at end of second month . . . 653 



246. Foetal pig, showing Wolffian bodies ' . . . . .655 



247. Foetal pig, showing first appearance of kidneys . . . 657 



248. Internal organs of generation ...... 657 



249. Internal organs of generation ...... 659 



250. Formation of tunica vaginalis testis ..... 660 



251. Congenital inguinal hernia ...... 661 



252. Egg of fowl, showing area vasculosa ..... 666 



253. Egg of fish, showing vitelline circulation .... 666 



254. Young embryo and its vessels ...... 667 



255. Embryo and its vessels, farther advanced .... 668 



256. Arterial system, embryonic form ..... 670 



257. Arterial system, adult form ...... 670 



258. Early condition of venous system ..... 672 



259. Venous system, farther advanced ..... 673 



260. Continued development of venous system .... 673 



261. Adult condition of venous system ..... 674 



262. Early form of hepatic circulation ..... 675 



263. Hepatic circulation farther advanced ..... 678 



264. Hepatic circulation, during latter part of foetal life . . . 676 



265. Adult form of hepatic circulation ..... 677 



266. Foetal heart ........ 678 



267. Foetal heart ........ 678 



268. Foetal heart ........ 678 



269. Foetal heart ........ 679 



270. Heart of infant ......".. 679 



271. Heart of human foetus, showing Eustachian valve . . . 681 



272. Circulation through the foetal heart ..... 632 



273. Adult circulation through the heart . 685 



