lo Aug.. 191-.] 



Arsenate of Lead. 



487 



Analysis of Lead Arsenate. 

 Original Sample. 



Marks 

 Elect ni 



Paragdii 

 Our Jack 



Blue Bell . 



<'nhra 



Heiuiii'iways 



Carlton 

 Magi)ie 

 Elephant 



Swift 



E. De Haens 



Blackhani * Co.. King-street 

 Vie. Orchardists' Co-op. As- 

 sociation 

 J. W. Moss & Co., William- 

 street 

 J. G. Mumford, Flinder.^-lane 

 J. W. Moss A Co.. William- 

 street 

 Vic. Orchardists Co-dj). 



Association 

 F. W. Prell, Queen-street 

 Chandler it Co.. Bninswick- 



street. Fitzroy 

 F. H. Bniuning. Elizalietli- 



street 

 F. R. Mellor. Elizabeth-street 

 F. K. Mellor, Elizabeth-street 

 A. Ferguson ct Co., Collins- 

 street 

 Rocke. Tompsitt & Co.. Flin- 

 ders-street 

 Heyne. Keislin tt Co.. St. 

 James-street 



Arsenic 

 Acid. 



2(1 37 

 31 34 



Ifi 38 

 18-35 



17 6(1 

 15 (Id 



1718 

 19 08 

 1 5 90 



1 5 49 



13 11 



Oxide 



of 

 Lead. 



75 (18 

 63-49 



21 -16 

 39 62 



35 34 



37 10 



43 12 



.38-48 

 37-75 



39-74 



31-78 



Water-Soluble Portion. 



On Dry Basis. 



Merks 

 Electro 

 Our Jack . 

 Paragon 

 Our Jack . 

 Vocal 



Blue Bell . 

 Cobra 



Hemingways 



Carlton 



Magpie 



Elephant 



Swifts 



E. De Haens 



Agent. 



Blackhani * Co., King-street 

 Vic, Orchardists' Co-op. Association . . 

 J. W. Moss * Co.. William-street 

 J. G. Mumford. Flinders-lane 

 J. W. Moss & Co.. William-street 

 Vic. Orchardists" Co-op. Association . . 

 F. W. Prell. Queen-street 

 Chandler it Co.. Brunswick-street. Fitz- 

 roy 

 F. H. Brunning. Elizabeth-street 

 F. K. Mellor. Elizabeth-street 

 F. R. Mellor, Elizabeth-street 

 A. Ferguson & Co., CoUins-street 

 Rocke. Tompsitt & Co.. Flinders-street 

 Heyne, Keislin ct Co., St. James-street 



Water-Soluble Portion. 



From the chemical composition, as determined bv analvsis. all the 

 brands appear to be of good quality, with one exception, the " Paragon." 

 It contains an excessive amount of water-soluble arsenic, which would 

 be, no doubt, harmful in its effect on the plant, while the others all con- 

 tain a small percentage of water-.solufjle arsenic. Anv brand mav be 

 considered safe to use .so long as the percentage of soluble arsenic does 

 not exceed i per cent. The matter of choice can be left to the individual 

 fancy as far as the quality of the cliff erent brands is concerned. The 

 difference in the arsenic acid content between the respective brands is only 

 one of many points connected with the efficiency of the spray, and one 

 should not judge any arsenate by its arsenic content, but rather by its 

 pro\ed effectiveness, which can onlv be ascertained by practical experience. 



P. Rankin Scott, 

 13th July, 1912. ("hemist for Agriculture. 



