New York AGricuLTURAL EXPERIMENT STATION. 239 
However, it is customary, in speaking of the amount of arsenic 
contained in Paris green, to refer to it as arsenious oxide ; and, 
using this form of expression, we would give the composition of 
pure copper aceto-arsenite as follows: 
Jn i WS 09 GEE Serene ee 58.64 per ct. 
TONG Ot Fac. s ca s yre eee see ler) wees: 
“Pennie CCG Cie SO ie ee Sree LO 0 Cea 
Paris green, as found in commerce, rarely, if ever, consists of 
pure copper aceto-arsenite, but contains this compound as its chief 
constituent with varying proportions of other substances. 
In the compound copper aceto-arsenite, there are, for each pound 
of copper oxide, 1.87 pounds of arsenious oxide. 
