268 



Bulletin 177. 



TABLE II. 



Analyses of Arsenites. 



Insecticide. 



Paris green 



Paragreue 



Green arsenite 



XX 



Pink arsenoid 



Green arsenoid 



Green arsenoid No. 53 



CuO 

 Copper oxid. 



Per cent, 

 23.62 

 27.68 

 31.59 



49.09 (PbO) 



29.29 



29.43 



SO3 



Sulfuric 

 acid. 



Per cent. 

 .71 

 1.34 



3.70 



1.55 

 3.70 



In Bullstiii 1J:9, page 720, the following analysis of Laurel green 

 was published : 



Copper (Cu) 10.00 per cent. 



Arsenic (AsgOg) 7.75 " 



This year an insecticide manufactured by the same firm and 

 labeled Special Laurel Green analyzed : 



Arsenic (AS2O3) total 42.69 per cent. 



" ." soluble 1.15 " 



Copper oxid (CuO) 4.50 " 



Lime (CaO) 35.39 " 



AYith its present composition this material evidently has value as 

 an insecticide, although no field tests have been made here. It is 

 manufactured by the Nichols Chemical Company of JSTew York and 

 retails for 12-J- cents per pound. 



Heretofore the ammonia test has been advised for detectino^ the 

 purity of Paris green. The pure Paris green which has been on 

 the market in the past does dissolve in ammonia completely ; but 

 this year samples have been received for analysis which do not, 

 although containing the 50 per cent of arsenic required by N^ew 

 York State law. The reason is that they contain lime as well as 



