353 



Notes on the Wolffian Body of Higher Mammals 



the sexual gland and the kidney respectively. The remaining lateral 

 surface is rounded^ as shown in Fig. 13. Three borders may be spoken 

 of: the ventral border, which is caused by the ridge in which the Wolffian 

 duct is situated; the medial border between the ventro- and dorso-medial 

 surfaces, and the more or less rounded dorsal border. The blood-vessels 

 enter and leave the gland at the medial border. The glomeruli are 

 situated beneath the ventro-medial surface. 



An attempt was made to determine the course of the tubules by means 

 of injections. Although by this method it was not possible to obtain 



Fig. 8. Wax reconstructiou of the Wolffian body of a pig's embryo 80 mm. long. 

 S, secretory portion of tubule; M, Malpigbian bodies; D, dorsal border; W. D., 

 Wolffian duct, anterior border. 



specimens showing the entire course of any one tubule, some interesting 

 facts were arrived at. By filling the allantois with colored fluid and 

 keeping up a constant pressure on it, the injection could be followed 

 with a lens. The fluid could be seen to run rapidly up the Wolffian duct 

 almost to its anterior extremity. A moment later the fluid entered the 

 tubules, beginning with the most posterior ones. In these it could be 

 followed around the lateral surface of the gland to the dorsal border, 

 where it plunged into the depths. A moment afterwards it entered 

 the capsules of the glomeruli. This same process could be followed 

 until the anterior end of the organ was reached. If pressure enough 



