LIST OF ILLUSTRATIONS. XX111 



295. Internal organs of generation, in the total pig, farther advanced . 787 



296. Formation of tunica vaginalis testis . . . . 788 



297. Congenital inguinal hernia ...... 788 



298. Egg of fish, showing vitelline circulation .... 791 



299. Diagram of the embryo, with umbilical vesicle and allantois . . 793 



300. Diagram of the embryo, showing the placental circulation . .794 



301. Venous system, in its earliest condition .... 797 



302. Venous system, farther advanced ..... 798 



303. Venous system, more fully developed ..... 798 



304. Venous system, adult condition . . ... . 799 



305. Early form of the hepatic circulation ..... 799 



306. Hepatic circulation, farther advanced ..... 800 



307. Hepatic circulation, in latter part of foetal life . . .801 



308. Hepatic circulation, adult condition ..... 801 



309. Foetal heart, earliest form ...... 802 



310. Fcetal heart, bent upon itself ...... 802 



311. Foetal heart, divided into right and left cavities . . . 802 



312. Foetal heart, farther advanced ... 802 



313. Heart of infant ..... .803 



314. Heart of human foetus, at sixth month . . . 804 



315. Diagram of foetal circulation through the heart . , . 805 



316. Diagram of adult circulation through the heart . . . 808 



