48 EXPERIMENTS ON THE CIRCULATION 



its limbs. A thread was then passed beneath the 

 aorta, and a knot tied at such a distance from the 

 vessel as not to obstruct the flow of blood. The left 

 kidney was now removed ; it weighed 33 grs. On 

 laying it open, the tubular portion was reddened, 

 and on dissecting off the lining membrane of the 

 pelvis, the primary arterial divisions beneath it were 

 seen to be imbedded in a quantity of clear lymph. 

 The paralysis of the hinder extremities never re- 

 turned. Four hours after the operation, it was alive, 

 and hopping about. At the end of eighteen hours 

 I found it dead. The right kidney weighed 35 grs. 

 No lymph could be seen beneath the lining mem- 

 brane of the pelvis. The bladder was distended 

 with urine, which was not albuminous. The ligature 

 hung quite loosely on the aorta, but some bloody 

 lymph had been effused around it. 



Exp. 2. In an animal of similar size to the last, 

 and, like it, in very poor condition, the aorta, being 

 exposed, was compressed by the same forceps, and 

 the animal then set free. There was perfect para- 

 plegia. The forceps being separated and withdrawn, 

 it continued to lie in the same position, having its 

 hinder extremities extended and useless, for a few 

 seconds, and then suddenly sprung up with a bound, 

 having perfectly regained the power of moving 

 them. The aorta was then tied tightly, when the 

 paralysis immediately returned, and continued un- 

 changed till death. The left kidney being now 

 removed, weighed 32 grs. ; on laying it open, the 

 redness of the tubular portion, and the effusion of 

 lymph beneath the membrane of the pelvis, existed 



