34 EXPERIMENTS ON THE CIRCULATION 



In removing the left kidney, care was taken to 

 secure the ureter as well as the blood-vessels. That 

 these albuminous matters were derived from the 

 right kidney, is proved beyond a doubt, by the exist- 

 ence of ecchymoses in its substance and on its 

 surface in two instances, (Exp. 4 and 7,) by the 

 increase of its weight, as seen in Exp. 6 and 7, and 

 by the fact of the morbid products being detected in 

 the right ureter in Exp. 6. 



By selecting strong full-blooded animals, the 

 repetition of this experiment would doubtless yield 

 results precisely similar to those just detailed. I 

 think the experiments related in the first division of 

 this class, though yielding but negative evidence in 

 support of the main point of this inquiry, are not 

 altogether undeserving of consideration, and may be 

 advantageously contrasted with the four last of the 

 third division. For we learn from the former that a 

 gradually increased quantity of blood may be directed 

 to the vessels of a part without occasioning any 

 material obstruction and compression of that fluid. 

 While the concluding experiments show clearly that 

 if the quantity determined to any particular set of 

 vessels be considerably and suddenly increased, then 

 some of the ordinary effects of undue compression of 

 the blood will be produced. 



Having now mentioned concisely the general 

 results obtained, I may be allowed to allude again 

 for a moment to those two conditions by which the 

 compression of the blood in its vessels is produced 

 and regulated. 



This compression is altogether di-pendont upon 



