388 FLOYD JOHN BRINLEY. 



difference of frog skin, it appears that dilute solutions of cyanide 

 cause an initial stimulation followed by toxicity. As the concen- 

 tration is increased, the stimulation is decreased and the toxicity 

 is increased until a certain concentration of cyanide is reached 

 where there is no stimulation but a marked toxic effect is evident. 

 The data also indicate that the molecule is more toxic than 

 the ion. 



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