﻿6 



T^TDIAXA TOIVERSITT 



medium sized dog. Electrical stimulation of a vagus nerve stops 

 the heart after repeated large injections of the substance. Inci- 

 dentally it may ])e mentioned that the secretory endings, of the 

 chorda tympani in the submaxillary gland, the endings of the 

 phrenics and the motor endings of the sciatic remain active through- 

 out the intoxication. Injection of a two per cent solution of ura- 

 nium nitrate causes a marked transient tall in blood-pressure which 

 can scarcely be tlistinauished from x\w ar-tion of amyl nitrite. Ura- 



Figure 1. Blood pressure and respiratory tracinsrs from a dog. Injection of 8 cc. of 

 2 per cent. (UO3) sodium-uranium-tartrate solution, (See text for description. 1 



nium acetate also causes a lowering of pressure. Disoclium tartrate 

 causes no effect upon the circulation aside from the increased vol- 

 ume of fluid in the vessels. 



Action on the Respiration. Injection of moderate amounts (7 

 to 10 cc.) of two per '^ent solution of . the doul)le_salt caused a very 

 slight increase in both rate and depth of respiration (Fig. 1). The 

 immediate cause of death was respiratory paralysis. Uranium has 

 long been supposed to possess au. action somewhat resembling that 



