REPORT OF ANALYSES OF PARIS GREEN AND 

 OTHER INSECTICIDES IN 1901 *t 



L. L. VAN SLYKE AND W. H. ANDREWS. 



SUMMARY. 



In accordance with the provisions of a law designed to pro- 

 tect purchasers of Paris Green, samples were secured during 

 1901 and the results are published in this Bulletin. 



In the 40 samples of Paris Green examined, the arsenious 

 oxide varied from 56.13 to 62.87 per ct. and averaged 58.10 per 

 ct. The water-soluble arsenious oxide varied from 0.88 to 2.64 

 per ct. and averaged 1.28 per ct. 



The copper oxide varied from 26.53 to 31.14 per ct. and 

 averaged 29.88 per ct. The amount of arsenious oxide in com- 

 bination with copper varied from 49.70 to 57.72 per ct. and 

 averaged 55.98 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. 



There are given, in addition, analyses of English Bug Com- 

 pound, Laurel Green, London Purple, and Paris-Green-Bordeaux- 

 Mixture. 



INTRODUCTION. 



During the year 1901, there were collected for analysis forty 

 samples of materials sold as Paris Green, and also two samples 

 of Laurel Green and one sample each of English Bug Compound, 

 London Pirt-ple, Paragrene and Paris-Green-Bordeaux Mixture. 

 The forty samples of Paris green represent twenty different 

 manufacturer^, eight of whom were not represented in the 

 samples examined by us in 1900. 



♦rrinted by the authority and under the direction of the Commissioner 

 of Agriculture. 



tA reprint of Bulletin No. 204. 



