REPORT “OF “ANALYSES® OF | (PARIS 
GREEN: AND OTHER JINSECPICi V2] 
IN 1902.*+ 
L. L. Van SLYKE AND W. H. ANDREWR. 
SUMMARY. i 
In accordance with the provisions of a law designed to pro- 
tect the purchasers of paris green, samples were secured during 
1902 and the results are published in this bulletin. 
In the 44 samples of paris green examined, the arsenious 
oxide varied from 55.39 to 61.40 per ct. and averaged 57.10 per 
ct. The water-soluble arsenious oxide varied from 0.61 to 1.35 
per ct. and averaged 1.01 per ct. 
The copper oxide varied from 27.03 to 30.79 per ct. and 
averaged 29.41 per ct. The amount of arsenious oxide in com- 
bination with copper varied from 50.63 to 57.60 per ct. and 
averaged 55.10 per ct. 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. 
INTRODUCTION. 
During the year 1902 there were collected for analysis 44. 
samples of materials sold as paris green, and also one sample of 
paragrene and one of aiboneta. The 44 samples of paris green 
represent 23 different manufacturers, 7 of whom were not repre- 
sented in the samples examined by us in 1901. 
For a discussion of the chemistry of paris green and for a 
statement of the methods of chemical analysis used see Bulletin 
No. 190, p. 284. 
*Reprint of Bulletin No, 222. 
+Printed by the authority and under the direction of the Commissioner of Agriculture. 
