98 



THE VENOMS OF CERTAIN THANATOPHIDEJB. 



REMARKS. 



Injected intravenously 0.003 gram dried venom of the Ancis- 

 trodon contortrix dissolved in 1 c. c. distilled water. 



Killed by pithing. 



REMARKS. 



Injected intravenously 0.003 gram dried venom of the Cobra 

 dissolved in 1 c. c. distilled water with a few crystals of 

 sodic chloride and filtered. 



Injected the same as the foregoing. 



Clot formed in canula. Killed animal by pithing. 



The Action of Pure Venoms on tJie Blood Pressure of Animals in wJiich the 

 Pneumogastric, Depressor, and Sympathetic Nerves and Spinal Cord have been 

 Severed. Since we found in the last series of experiments that after section of the 

 cord there did not occur such a decided primary fall of pressure, it seemed obvious 

 that the fall of pressure must be due, in major part at least, to a toxic depression 



