﻿ARSENIC ALS. 55 



The conclusions that may be drawn from this investigation are 

 that a chemical analysis of an arsenical does not give sufficient data 

 to judge satisfactorily its insecticidal properties, and a toxicil y si u<l . 

 alone does not show that an arsenical is suitable for general in eel i 

 cidal purposes, but both a chemical analysis and a thorough toxicil v 

 study are required in order to judge whether or not an arsenical is 

 a satisfactory insecticide. 



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(9) Coad, B. R. 



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(11) 



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(18) and Smith, C. M. 



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