12 URANIUM, ANTIMONY, CHROMIUM, & C . 



He found by analysis that this salt was a com- 

 pound of 



Peroxide of uranium 0-9912 



Protoxide of lead 1 -3088 



2-3000 



When 2-3 parts of this salt in an anhydrous 

 state were decomposed by hydrogen gas, the 

 water evolved weighed 0-164, containing 0-14577 

 oxygen. Now, by this process, both the oxides 

 were reduced to the metallic state : 1 -3038 of 

 protoxide of lead contain 0-0935 oxygen, which 

 subtracted from 0-14577 leaves 0-0522 for the 

 quantity of oxygen contained in 0-9912 per- 

 oxide of uranium. It is easy from these data to 

 deduce the quantity of oxygen contained in 100 

 parts of peroxide of uranium : it is obviously 

 5*2663 parts. So that peroxide of uranium is 

 composed, according to this experiment, of 



Uranium 100 



Oxygen 5-559 



Another experiment was made with another por- 

 tion of uraniate of lead composed of 



Peroxide of uranium 1 -086725 



Protoxide of lead 0- 1 73275 



1-260000 



The water obtained weighed 0-0785, equivalent 

 to 0-0697 oxygen ; of this oxygen 0-012377 be- 



