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 toxicity study 
alone does not show that an arsenical is suitable for general insecti- 
cidal purposes, but both a chemical analysis and a thorough toxicity 
study are required in order to judge whether or not an arsenical is 
a satisfactory insecticide. 
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