ANTIMONY. 11 



stannous chloride. The excess of this reagent was chlori- 

 dized by mercuric chloride, calomel being separated by fil- 

 tration. The experiment was continued exactly as in the 

 cases where the oxide was taken to start with. The mean 

 of the experiments on metallic antimony was 122.34. The 

 mean of the seven experiments above described is 122.24; 

 extreme difference, 0.94. K =: 39.12 ; CI = 107.97. Kessler 

 also made experiments by Rose's method, but got discord- 

 ant results. [Poggend. Anii., 113, 1861, 145.) 



B. Unger: 119.76 (0 = 16). 



Determined by analysis of sodium sulph-antimonate, 

 (Schlippe's Salt.) {Kopp's Jarresbericht, 1871, 325; Arch, 

 der Pharm., (2,) 1^7, 193; 14-8, 1.) A single determination 

 by a method from which great accuracy could not be ex- 

 pected. S = 32 ; Na = 23. (J. P. Cooke, Jr., in Proc. 

 Amer. Acad., IS, 6.) 



J. P. Cooke Jr.: 120 (O = 16). 



Cooke objects to the determinations of Dexter and Dumas, 

 on the ground that there is no sutHcient evidence of the 

 absence of higher or lower compounds of the same elements 

 in the salts employed. 



In two experiments antimony was dissolved and precipi- 

 tated as sulphide, which was heated to 240° before weigh- 

 ing. The formation of free S was prevented, occluded 

 tartaric acid was determined, but occluded oxy-chloride was 

 neglected. The experiments gave each Sb = 120.6 for S 

 = 32. In thirteen experiments Sb was dissolved in a mini- 

 mum of nitric acid, and the solution boiled over bullets of 

 Sb to complete saturation. The sulphide was then precipi- 

 tated in an atmosphere of carbon di-oxide. The precipitate 

 contained no free S. The oxy-chloride was driven off at 

 180° and determined. The tartaric acid was decomposed 

 at 210° and determined. The errors are opposed and min- 

 ute. The mean of the weighings of sulphide, dried at 180°, 

 gave Sb = 119.994 for S = 32; extreme difference, 1.01. 

 The mean of weighings of sulphide heated to 210° gave Sb 

 = 120.295; extreme difference, 1.07. General mean Sb = 

 120.145. Fifteen analyses of antimonious bromide gave the 

 Br contents at 66.6665 per cent, for Ag = 108, Br = 80, with 

 an extreme difference of 0.195. This composition gives Sb 

 120. In seven experiments the iodide was analyzed. For 

 I = 127 and Ag = 108, it gave a mean of 76.051 per 

 cent. Sb, or Sb = 120. It was also shown that the chloride 



