190 THE ATOMIC WEIGHTS. 



28.559 

 28.557 

 28.501 



28.554 

 28.532 

 28.485 

 28.492 

 28.481 



Mean, 28.520, d= .008 



Hence, if S = 32, Sb = 120.3. 



Immediately after the appearance of Schneider's memoir, 

 Rose * published the result of a single analysis of antimony 

 trichloride, previously made under his supervision by Weber. 

 This analysis, if CI = 35.5, makes Sb = 120.7, a value of 

 no great weight, but in a measure confirmatory of that ob- 

 tained by Schneider. 



The next research upon the atomic weight of antimony 

 was that of Dexter,t published in 1857. This chemist, hav- 

 ing tried to determine the amount of gold precipitable by 

 a known weight of antimony, and having obtained discord- 

 ant results, finally resorted to the original method of Ber- 

 zelius. Antimony, purified with extreme care, was oxidized 

 by nitric acid, and the gain in weight was determined. 

 From 1.5 to 3.3 grammes of metal were used in each experi- 

 ment. The reduction of the weights to a vacuum standard 

 was neglected as being superfluous. From the data ob- 

 tained, we get the following percentages of Sb in Sb2 04 : 



79.268 

 79.272 



79-255 

 79.266 



79-253 



79.271 



79.264 



79.260" 



79.286 



* Poggend. Annal., 98, 455. 1856. 

 f Poggend. Anna]., 100, 563. 



