IN THE KIDNEY. 47 



tionately large ; each weighed 36 grs., and the 

 tubular portion of each was reddened. The urine 

 was tested with nitric acid. In a small quantity, 

 there was no appearance of albumen ; in a larger, 

 some permanent opacity was produced, not removable 

 by a slight excess of the acid. 



Exp. 2. The aorta was tied, from an incision on 

 the left side of the spine, in a middle-sized animal, 

 in poor condition. There was immediate paraplegia, 

 as in the last instance. Some haemorrhage from the 

 smaller vessels occurred. It was killed at the end 

 of forty minutes. Both kidneys were of a lighter, 

 or more rosy tint than natural ; the tubular portion 

 of each was reddened. The left weighed 4 grs. 

 more than the right ; probably from the lower origin 

 of the left renal artery in this instance. The urine 

 in the bladder was not albuminous. 



C. - - Ligature of the aorta and removal of one 



kidney. 



Exp. 1. The aorta of a middle-sized animal, in 

 poor condition, being exposed by an incision in the 

 left lumbar region, it was grasped by a spring forceps 

 of moderate power. The obstruction to the flow of 

 blood was complete, for the artery visibly enlarged 

 above the point of compression. The animal was 

 then liberated, and its hinder extremities were seen 

 to be paralysed, the useless limbs trailing after the 

 rest of the body. The blades of the forceps were 

 then separated, and carefully withdrawn, and the 

 animal almost instantly regained the power of moving 



