ANTIMONY. 225 



These figures confirm his old resuUs, and may ])e fairly combined with 

 them and with the percentages found by Cooke, as follows : 



Schneider, early series 28.520, zb .008 



Schneider, late series 28.541, ^t .0024 



Cooke 28.5182, ± .0120 



General mean 28. 5385, ± .0023 



In 1881 Pfeifer* determined electrolytically tlie direct ratios between 

 silver and antimony, and copper and antimony. With copper the fol- 

 lowing data were obtained : 



Oa( : .%;, : : lOO : X. 

 1.412 grm. Sb = i.rooS Cu. 128.270 



1.902 " 1.4832 " 128.236 



3.367 " 2.6249 " 128.272 



Mean, 128.259, ± .0077 



If Cu = 63.6, Sb = 122.36. 

 With silver he found — 



Mean, 37.4S5, zb .0198 



If Ag = 108, Sb = 121.4.5. 



The latter ratio was also determined b}^ Popper,t several j^ears after- 

 wards. The two metals were precipitated simultaneously by the same 

 current ; and in some experiments two portions of antimony were thrown 

 down against one of silver. These are indicated in the subjoined table 

 by suitable bracketing, and the ratio is given in the third column : 



Sb. Ag. Ratio. 



1-48561 3_^655 ^7.463 



1.4788 -t 37.292 



^•°^^°1 5-3649 37.503 



2.0074 J 37-4' 7 



3 8882 1 ^7.480 



•^ V 10.3740 :>/.'<•" 



3.8903 i • 37.500 



4.18931. „_,847 37.455 



4-1885 » 37.447 



* Ann. Chem. Pharm., 209, 161. 

 t Ann. Chem., 233, 153. 



15 



