AND BLOOD PRESSURE 



115 



In one case the kidneys of a middle-aged cat were successfully 

 grafted on to a young adult. The animal lived as a normal cat 

 for fifteen days, but then became emaciated and died on the thirty- 

 sixth day. The arteries of the young cat, the costal and bronchial 

 cartilages and all the scar tissue where it had been incised were 

 calcified as hard as glass. The transplanted kidneys and renal 

 vessels, on the other hand, showed no sign of calcification. The. 

 kidneys were somewhat cedematous but showed no very serious 

 pathological change. This result the calcification of the host 



Fio. 5. The cat three weeks after the operation. 



but not of the graft was only obtained once, but it is one which 

 opens up a wide vista of new ideas and research. 



In carrying out the operations the kidneys are deprived of 

 circulation for more than an hour, and are washed out with 

 Ringer's solution. The vaso-motor nerves are cut it has been 

 proved that kidneys can functionate normally after this operation 

 and the anaemia probably destroys the local renal ganglia, for 

 nerve cells in the central nervous system do not recover function 

 after at most twenty minutes 1 total deprivation of blood flow. It 

 is very important in such operations that the veins be given their 

 normal situation and direction. The writer's explanation of this 

 is that every departure from the normal course by preventing the 



1 In one case twenty-hint- minutes ((Jutlirie). 



