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 russellii, 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 aniline 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 Research, New York, 1906. 
