ITew Yokk Agkicttlttjeal 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: 



Arsenious oxide 58 . 64 per ct. 



Copper oxide 31 . 30 



Acetic acid . . . .- 10.06 



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, 1.8Y pounds of arsenious oxide. 



