ANALYSIS OF EN8ECTICIDE8 AND FUNGIC] 



11 



K.s \\i> FUNGICIDES, OTHER THAN PARIS GREEN &KD LONDON 



1TIM-I.K. TIIVI ri.vr\i\ IE8ENIC, cniM-Ki:. <i: Horn. \> ini.ii: A<TIVK 

 CONSTITUENTS, 



In Table IV i-> given a compilation of aiialx >e-> of (irecn Arsenoid. 

 (liven Aisenite. 1'aragivne. Laurel ( i iv< MI. and White Arsenic. tget her 

 with two analyses of White Ar>enic made in this laborator. 



TAMI.K IN'. ( 



of Green .l/></<"/W, Green jlnenite, r>ir<i<ji-<u< , /,'/*//-. /', 

 timl M "//;/, Anenic, 



oTlu- followin?,' coustituents were also iresi-ut: Silica. (I. id per rent: organic matter, r,.C.7 IHT cmt. 



''In sample No. 30 the following constituents wen- also present: Acetic acid. (1.7'J per cent: calcium 

 sulphate. 19.31 per eeiit: sodium sulphate. 'J.'Jti i>er cent: sodium ehlorid, 0.'J5 percent: ferric oxid, 

 0.20 per cent 



'Large amounts of caloium carhonaieand liydrate were also present. 



, '/This analysis was made in accordance with'the Texas law regulating the sale of Paris (Jreen and 

 other insecticides and is good only until May 1. 1902. 



eThe method of analysis used is that described for total arseuious oxid in I'ari- (Jreen in Bulletin 

 68 of this Bureau. 



The figures obtained by different analysts for (Jivon Arscnoid. 1'ara- 

 grene, and Laurel Green show that the composition of these substances 

 is very variable, especially as to the content of arscnious oxid. which 

 varies in the first case from 50.77 per cent to 61.43 per cent, in the 

 second from 19.31 per cent to 55.57 per cent, and in the third from 

 3.83 per cent to 42.69 per cent. The figures obtained for soluble 

 arsenious oxid, here as elsewhere in this compilation, can not be com- 

 pared, since the methods of extraction were very likely different. 



The two samples of White Arsenic analyzed in this laboratory were' 

 received from Boise City, Idaho, by the Division of Entomology. 

 They are both evidently of exceptional purity and will give good 

 results when used for preparing Calcium Arsenite. the purpose for 

 which they were purchased. 



