LIST OF ILLUSTRATIONS. XXlii 



FIO. PAGE 



244. The dorsal half of the heart of a human 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 



248. Transverse section across the body of a human embryo estimated 



as fourteen days old. (After Kollmann) 589 



24D. The adult ovary, parovarium and Fallopian tube. (From Quain's 



* Anatomy,' after Kobelt) 595 



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



(From Kolliker, after Ecker) 596 



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



(From Kolliker, after Ecker) 596 



252. The external genitalia of a male human embryo 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 Kolliker, 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 



