REPORT OF ANALYSES OF PARIS GREEN 
AND OTHER INSECTICIDES 
La Le Van Siuake, 
SUMMARY. 
In accordance with the provisions of a law designed to pro- 
tect purchasers of Paris green, samples were secured during 1899 
and the results are published in this bulletin. 
Paris green contains as its chief constituent a compound called 
copper aceto-arsenite, which, when chemically pure, contains 
PATRORIGUSIOXIGO rAd site we. -cscstese bore Po 58.64 per ct. 
ON Mors Id Ge wwegtestl Ss aaccir oc1¢ 4 31.30 fy 
Cay CEES Pe Snare ae ot ae 10.06 rf 
In the 24 samples of Paris green examined, the arsenious 
oxide varied from 55.34 to 60.16 per ct. and averaged 56.48 per 
ct. The copper oxide varied from 27.70 to 30.90 per ct., and 
averaged 29.97 per ct. The amount of arsenious oxide for each 
pound of copper oxide varied from 1.82 to 2.17 and averaged 
1.88 pounds. The only adulterant that could be found was white 
arsenic and this was excessive in only one sample. The general 
result of the examination is to show a good quality of Paris green 
in the market at the time the samples were taken. 
Partial analyses are given of the following materials: Para- 
grene, Black Death, Slug Shot, London Purple, Laurel Green, 
Smith’s Electric Vermin Exterminator, Bug Death. 
INTRODUCTION. 
During the past ten years the use of Paris green has very rap- 
idly increased, owing to its efficiency as an insecticide. There 

* Reprint of Bulletin No. 165. 
