THE CHEMICAL STUDY OF SNAKE-VENOMS 167 



Noguchi/ with reference to the photodynamic action of eosin and 

 erythrosin upon the venoms of the Cobra, Vipera russelUi, and 

 Crotalus. It was found by the scientist in question that the 

 toxicity of these various venoms is more or less diminished in 

 the presence of these anihne colours, when the mixtures are 

 insolated. Cobra-venom is the most resistant, just as it is in 

 regard to the other physical or chemical agents. That of Crotalus, 

 on the contrary, is the least stable. 



' Rockefeller Institute for Medical Besearoh, New York, 1906. 



