324 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



In 1881 Pfeifer ' determined electrolytically the direct ratios between 

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

 ing data were obtained : 



3Cu:281)::100:x. 

 1.412 grm. Sb = 1.1008 Cu. 128.270 



1.902 " 1.4832 " 128.236 



3.367 " 2.6249 " 128.272 



Mean, 128.259, ± .0077 



0198 

 Hence Sb= 121.32. 



The latter ratio was also determined by Popper," several years 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. 

 1.4856 

 1.4788 

 2.0120 

 2.0074 

 3.8882 

 3.890 

 4.1893 

 4.1885 

 4.2710 

 4.2752 

 5.G8G0 

 5.6901 

 4.4117 

 4.9999 

 5.2409 



I] 



Ag. 

 3.9655 



5.3649 



10.3740 



11.1847 



11.3868 



15.1786 



11.8014 

 13.3965 

 14.0679 



Ratio. 

 37.463 

 37.292 

 37.503 

 37.417 

 37.480 

 37.500 

 37.455 

 37.447 

 37.507 

 37.545 

 37.460 

 37.487 

 37.383 

 37.322 

 37.250 



Mean, 37.434, ± .0149 

 Pfeifer found, 37.485, ± .0198 



General mean, 37.452, ± .0119 



1 Ann. Chem. Pliarm.,- 209, 

 = Ann. Chem., 233, 1.53. 



