REPORT OF THE CHEMIST 



!99 



SESSIONAL PAPER No. 16 



in quality was the result of faulty preparation. That it was not the intention of the 

 manufacturers to sell a wash of inferior quality may, we think, be deduced from the 

 figures of No. 8910, a sample of the same brand sent in some two months later and 

 which was found to be quite satisfactory and of normal strength. 



The sample of Niagara brand (No. 81S2) is practically identical in composition 

 with that previously analysed, indicating a carefulness to obtain, from year to year, 

 uniformity in strength. 



No. 8840. — The Lion brand, manufactured by the James A. Blanchard Company, 

 Brooklyn, N.Y. This is a satisfactory and well-made wash, of full strength both as 

 regards total sulphur and that present as sulphides. 



Nos. 8934, 8935 and 8936, are brands sold in British Columbia, the first two being 

 of Canadian manufacture and the last imported from California. The data indicate 

 that these samples are very similar in composition and of full strength. Kelatively 

 they would be placed in the order of their ' sulphur as sulphide ' since it is upon the 

 soluble sulphides that the efficiency of the spray depends. 



A determination of the total soluble sulphur-content and that of the sulphur 

 present as sulphide requires chemical analysis, but it may be of some assistance to 

 the orchardist to remember that a well-made, full strength lime-sulphur wash is of a 

 deep orange-red colour, clear or with very little sediment. 



ARSENATE OF LEAD. 



The composition of the better-known commercial brands of Arsenate of Lead and 

 the preparation of the home-made article, were discussed in the report of this Division 

 for 1909. No general examination of the brands of this insecticide has been made 

 during this past year, but an example of faulty preparation, resulting in an impure 

 product, having been brought to our notice we were able by analytical work and advice 

 to assist the manufacturer in eventually turning out a satisfactory product of full 

 strength. 



Another case brought to our notice was that of an impure lead arsenate, which 

 contained a very large percentage of free arsenious acid and consequently was quite 

 unsuitable for use as an insecticide. This, on our representations, was withdrawn from 

 the market. 



In addition to the foregoing, three brands not hitherto reported on by us have 

 been analysed, the results being as follows: — 



ANALYSIS OF ARSENATE OF LEAD. 



Constituents. 



Water . .... 



Total arsenic oxide 



Total lead .. 



Soluble impurities 



Insoluble h (by difference) 



Solul.de arsenic oxide 



lead >t 



Laboratory No. 

 8180. 



49 99 



1473 



3156 



298 



•74 



100 00 



14 

 nil. 



Laboratory No. 

 8839. 



40 



14 



41 



2 



1 



17 

 CO 

 ■38 

 00 

 85 



10000 



•44 

 nil. 



Laboratory No. 

 3949. 



50 



12 



31 



4 



00 

 •65 



•80 

 ■83 



■72 



100 00 



•21 

 nil. 



Laby. No. 81S0 



■Merrimac Chemical Co., Boston, Mass., U.S.A. 

 Lion Brand, Jas. A. Blanchard Co., N.Y., U.S.A. 

 8949— Acadia Brand, Wolfville, N.S. 



8839 



