42 URANIUM, ANTIMONY, CHROMIUM, c. 



ties of deutoxide of antimony. The loss of 

 weight sustained in this case was owing to the 

 escape of oxygen ; for, if 100 grains of peroxide 

 of antimony be heated to redness in a small 

 green glass retort, connected to a pneumatic 

 trough, the gaseous product evolved, which is 

 oxygen, amounts nearly to 19 cubic inches. 



7'5 peroxide being converted into 7 deu- 

 toxide, it is plain that deutoxide of antimony is 

 composed of 



Antimony . . 5-5 



Oxygen . . 1-5 



Or, it consists of 1 atom of antimony united to 

 1 2 atom oxygen. 



It is this deutoxide that is formed when any 

 of the other oxides of antimony is exposed to a 

 red heat. In this respect antimony and manga- 

 nese resemble each other > for, whenever any 

 oxide of manganese is exposed to a low red heat, 

 it is always converted into deutoxide of manga- 

 nese, which, like the deutoxide of antimony, is 

 a compound of 1 atom manganese and li atom 

 oxygen. 



Atom of 3. It was unnecessary to subject the protoxide 

 of antimony to any analysis ; for, if we compare 

 Berzelius' experiments on it with the analysis 

 of the deutoxide and peroxide of antimony in 



