LIST OF ILLUSTEATIONS. xxiii 



244. The dorsal half of the heart of a hrnnan embryo twenty-eight days 



old, seen from within. (After His) . .... 569 



245. The aortic arches of a human embryo thirty-two days old, from the 



left side. (After His) ... 576 



246. The aortic arches of a human embryo thirty-five days old, from the 



left side. (After His) . . 577 



247. The liver, and the veins in connection with it, of a human embryo 



twenty-four or twenty-five days old, seen from the ventral sur- 

 face. (After His) . . - . 580 

 24S. Transverse section across the body of a. human embrj'^o estimated 



as fourteen days old. (After KoUmann) . . . 589 



249. The adult ovary, parovarium and Fallopian tube. (From Quain's 



• Anatomy,' after Kobelt) ... . 595 



250. The external genitaha of a human embryo of about the ninth week. 



(From Kolliker, after Ecker) . ... .596 



251. The external genitalia of a human embryo oE about the tenth week. 



(From Kolliker, after Ecker) . ... 596 



252. The external genitaha of a male human embrro towards the end of 



the third month. (From Kolliker, after Ecker) . . 597 



253. The external genitalia of a female human embryo towards the end 



of the third month. (From KolUker, after Ecker) . . . 597 



254. A diagrammatic section of the pregnant human uterus at the 



seventh or eighth week. (From Quain's ' Anatomy ,' after Allen 

 Thomson) 600 



255. A pregnant human uterus of about the twenty-fifth day. (From 



Quain's ' Anatomy,' after Coste) . . . , . . 608 



