186 



EXPERIMENTAL FARMS 



9-10 EDWARD VII., A. 1910 

 Analysis of Grassell's Bordeaux-Lead Arsenate Products. 



Water 



Hydiate of Lime,' '[da(bH),']'. ...V^.V. .'". 



Oxide of Lime, (CaO) . . . 



Cop[jer Sulphate Crystals, (CuSO^SHjO). 



Copper Sulphate, Anhydrous, (CuSO^). . . 



Oxide of Lead, (PbO) 



Arsenic Oxide (AsjOj)". 



No. 67G1. 



No. 6762. 



p. c. 

 57 07 

 19-59 



13-62 



5-89 

 3-40 



p. c. 



G-87 



32-31 



18-64 



22-51 



8-84 



Neither of them show excess of sulphate of copper, indicating their non-injurious 

 character to foliage. With respect to the paste (No. C761) the directions state : ' No 

 general rule as to the amount to use can be given. Ten pounds to 60 (U.S.) gallons 

 are used for general spraying. For spraying trees having a delicate foliage, such as 

 peach trees, 10 pounds to 100 gallons of water will be effective.' It may be remarked 

 that at the rate of 10 pounds per 60 (U.S.) gallons the spray would be about one-third 

 as strong as that resulting from the 4:4:40 formula. The powder (No. 6762) is in- 

 tended to be used only in the dust form. 



LIME-SULPHUR WASHES. 



This spray, as pointed out in our last annual report, is now being widely used both 

 as an insecticide and a fungicide, not only on dormant wood but, in a diluted form, 

 during the summer.* There seems but little doubt but that the efficiency of the spray 

 depends upon the amount of sulphur present in the form of sulphides. We have, 

 therefore, in the examination of certain brands sold on the Canadian market, deter- 

 mined both the percentage of total sulphur in solution and that of the sulphur com- 

 bined as sulphide. 



Lime-Sulphur Washes. 



o 



o 



-§ 



6832 

 6935 

 6933 



6934 

 6822 



6766 

 6936 



Brand and Manufacturer. 



Vanco Lime-Sulphur Wash, Chemical 

 Laboratories Ltd., Toronto. 



Lime-Sulphur Wash, St. Catharines 

 Cold Storage Co. 



Lime-Sulphur Wash, GrasselH Chemi- 

 cal Co., Cleveland, U.S.A. 



> 



u 

 00 



a 



eg 



<o 



a, 



1-314 

 1-304 

 1-133 



1-129 

 1-279 



1-280 

 1-280 



Sulphur in 

 Solution. 



o 

 H 



p. c. 

 27-58 

 26-65 

 9-98 



9-92 

 24-76 



24-80 

 25-13 



^^ 





p.c. 

 26-87 

 25-55 

 6-49 



6-90 

 23-38 



23-37 

 24 12 



Remarks. 



Deep orange, red fluid, 

 clear, very slight deposi t 



Light orange-red fluid, 

 considerable black de- 

 posit. 



Deep orange-red fluid, 

 clear, very slight de- 

 posit. 



* Particulars useful to those preparing the wash on the farm will be found on pages 

 169-170, Report of Chemist, for year ending March 31, 1908. 



a Origitial wash diluted with eleven parts of water, as directed by manufacturer. 



6 Original wash diluted with an equal volume of water, as directed by manufacturer. 



