Proceedings, V,)l:i. 



13 



(7.) Limn-sulphui' 17.5 cc. 



H.O -1S2.0CC. 



Zinc - arsenite ( Slierwin 



Williams) 0.6 gms 



(S.) Black Leaf 40, ]-l,flO<). .500.0 cc. 

 Zinc - arseuite (Sherwiu 



Williams) 0.6 gmi 



(0.) Lime-sulphur ]7.5cc. 



Black Leaf 40, 1-1,000. .482.5 cc. 

 Zinc - arsenite (Slierwin^ 



Williams) 0.0 gms 



(10.) Limo-snlpliur 17.5 cc. 



Black Loaf 40, 1-1,000.. 4S2.5 cc. 



solution of this experiment, due to the sus- 

 pended particles of residue formed by the 

 Black Leaf 40 and lime-sulphur. Some of 

 this residive has already settled, but appar- 

 ently not all. The arsenate of lead, which is 

 a dirty black, settled first and the other settled 

 on top of it. 

 June 1st. Liquid colour of dilute lime-sulphur. 

 A considerable amount of free sulphur has 

 been liberated, and there is also present a con- 

 siderable amount of hlack flocculent residue 

 from the lime-sulphur + Black Leaf 40 mixture 

 which has settled on the black-lead deposit. 

 BetweeBi these residues there is a thin line of 

 some thin crystalline substance which Pro- 

 fessor Tartar suggests may he arsenate of 

 lime. 



May 29th. Combined above materials to get 

 data on results and to note any decomposi- 

 tions of materials. Colour of solution quite 

 similar to that of lime-sulphur of an equal 

 strength with straight water. Slightly cloudy 

 or muddy. The residue was a light grey, being 

 quite a little lighter than that of the neutral 

 arsenate of lead. 



.Tune 1st. Solution colour of dilute lime- 

 sulphur. A ver.y small amount of free 

 sulphur shows <>u top of the residue (only 

 a trace). 



May 2!>th. Combined the above materials to 

 gi»t data on results and to note any decom- 

 position of materials used. The colour of the 

 arsenite of zinc was covered with a pink 

 colouring substance. After standing several 

 hours there seemed to be decomposition of 

 either the Black Leaf 40 or the zinc-arsenite. 

 The latter lost most of its pink colour and 

 appeared dirty white. This zine-arsenite is 

 more finely divided than that of the Cali- 

 fornia Spray Co. 



June 1st. Liquid almost white with a slight 

 tinge of black. Jvo change. Apparently no 

 decomijosition. 



May 20th. Combined the above materials to 

 get d.ata on combinations and to note any 

 decomposition of materials whicli might take 

 place. The solution was hlack, but appeared 

 no different from the solution of lime-sulphur 

 and Black I-eaf 40. The zinc-arsenite had 

 of course settled and, being more or less 

 mixed with the residue formed by the' Black 

 Ix'af 40, appeared slightly different from the 

 z.inc-arsenite lime-sulphur combination. The 

 zino-arsenite does not seem to be affected by 

 either the lime-sulphuT or Black Leaf 40 to 

 any great extent. 



June 1st. Solution colour of dilute lime- 

 sulphur. Arsenite of zinc a grey colour, 

 showing dark grey at upper surface when 

 solution and residue of Black Leaf 40 come 

 in contact. Black Leaf residue black and 

 flocculent. A small amount of free sulphur 

 present. 



May 29th. The above materials were combined 

 to get data on the result and lo note any 

 decomposition which might take place. When 

 first combined the liquid turns a very dark 



