IN THE KIDNEY. 27 



At the end of seven hours the blood was com- 

 pletely stagnant in all the vessels. 



At some points slight extravasation had appa- 

 rently taken place, for the red outline of the vessels 

 was irregular and ragged. In other places the red 

 line marking their breadth was uniform and even ; 

 but a white line of opacity (not unlike that caused 

 in transparent tissues by the effusion of lymph) was 

 situated externally to it. 



Various stimulants were then applied to the web 

 without producing any distinct effect either on the 

 vessels or on the blood which they contained. The 

 limb never recovered its vitality, and subsequently 

 underwent the various changes of mortification. 



As these effects were such as might have been 

 expected from previous reasoning, and as they were 

 precisely analogous to those which I presumed to 

 occur in the minute vessels of the kidney during the 

 existence of an obstruction to the circulation of the 

 blood through them, I did not think it necessary to 

 repeat the observation. 



CLASS I. 



ILLUSTRATING THE EFFECTS OF VENOUS OBSTRUCTION. 



A. The ligature around the renal vein being tightly 

 applied, and no haemorrhage occurring from any of 

 its branches. 



