EXPERIMENT STATION BULLETINS. 



tuo 



PARIS GREEN 



Only eight samples-were collected and analyzed, all of wliicli wei-e found 

 to conform to the h^gnl standards, l)oth as to total ami soluble arsenious 

 oxide (ASoO..). 



Two samples of ''Buy; Finish"' nianurachii-ed l».v (he Alichi.uan (ivpsiiMi 

 Co., (Jrand Ha])ids, Miclugan, and one sample of "Kug- I)oi)e."' prei>ared by 

 H. J. Smith & Co., Utica, New York, are included in the tabic. These arc 

 mixtures of inert materials, such as<>;y]»sum. and a small amount of paris 

 green for dusting. 



PARIS GREEN 



No. 



376 



301 

 383 



157 



.368 



389 



349 

 342 



Manufacturor. 



Corona Chemical Co., Milwaiikee, 



Wis 



DeVoe& Kavnolds. New York, N. Y. . 

 Detroit White Lead Works, Detroit. 



Mich .' 



Imperial Cliemical Co., Grand Rapids 



Mich .- 



Imperial Cliemical Co., Grand Rapids, 



Mich 



Imperial Chemical Co., Grand Rapids, 



Mich ^■ 



Fred L. Lavcnhurg, New York, N. Y.. 

 Sherwin - Williams Co., Cleveland 



Ohio. . 



Weiglit. 



Oz. 

 15.9 

 4.2 



17.3 



Arsenious o.\ide AS2O3. 



Total. 



Found. Guar 



55.65 

 55 90 



. . . , ! 55 71) 



2 1 j 55 60 



4 5t) 30 



4 I 50.40 



5 S ."■."> 20 



50 



.")0 



Soluble. 



Found Guar 



2.39 



1 .-.() 



3 50 



3 50 



Coppei 

 oxide 



(CuO) . 



30 23 



29 92 



30 39 



31.30 



30 39 



29.76 

 30 23 



30 86 



p.r(; FINISH 



324 

 193 



The Michit;an Gypsum Co., Grand 

 Rapids, Mich 



The Michigan Gypsum Co.. Grand 

 Rapids, Mich 



r,-2 



II 1,11 



184 



r.iG noi'K 



H. J. Smith & Co.. Utica. N. Y. 



0.60 



CONCERNING COMMEUri.VI. I'.oKPK.M.X .MIXTI KIOS .\ .\ 1 • I'.i >|; | .1 ;.\ 1 \ .\ i;si; \ .\ IK 



MIXrrUKS 



During the past few years tlicic have aiypcaicd on the niarkcl an in 

 creasing number of cdmmercial bordeaux and bordeaux arsenat*' ini.xt ui-es. 

 The use of these ))repa rations during the past two years was stinmlatcil by 

 tlic Iiigh pric«' and .scarcity of copi)er sulfate. With a retui-n of prices to 

 appro.ximatel.v the i)re-war h'V<'l it may be interesting ti» <'<»nipar(' thes<' 

 commercial i>roducts with the home-made ])i"eparations. In order to do 

 this it is necessary to take into consideration two factors, namely, the 

 chemical composition and physical condition. 



Chemical C out position. The fungicidal value of bordeaux niixiui-e is 

 due to the presence of coi)]>er. The sti'ength of lionieinade solutions is 



