40 URANIUM, ANTIMONY, CHROMIUM, c. 



own in a very satisfactory manner ; and seem to 

 leave no doubt that the atomic weight of ura- 

 nium and its oxides have been rightly deter- 

 mined. 



The tendency which peroxide of uranium has 

 to form sesquisalts is very curious. It would 

 have led me to hesitate about the atomic weight 

 of this metal, had I not likewise met with se- 

 veral neutral compounds of the peroxide of ura- 

 nium and acids. 



SECT. II. 



OF THE ATOMIC WEIGHT OF ANTIMONY. 



THE laborious experiments of Proust and Berze- 

 lius to investigate the oxides of antimony are 

 well known to the chemical world. It is unne- 

 cessary to refer to them farther than to say, 

 that they guided me in my researches, and con- 

 tributed essentially to the accuracy of my re- 

 sults. 



T btain pure antimony I dissolved the anti- 

 pure anti- mony of commerce in nitro-muriatic acid, and 



mony. 



precipitated the peroxide by means of water. 

 This oxide was well washed, dried, mixed with 

 black flux, and exposed to a red heat in a cover- 

 ed crucible. The metallic antimony thus ob- 



