URANIUM. 5 



reduced to powder, and the powder had a dark 

 green colour. The weight of the protoxide thus 

 obtained was 27 grains ; so that the loss of 

 weight was 4-875 grains. 



The 18 grains which sublimed first I consider 

 to consist of 



3 atoms carbonate of ammonia 14-625 

 3 atoms water . . 3-375 



18 



By dissolving the matter in water, and mixing 

 the solution with muriate of lime, I found by the 

 weight of the precipitate that the carbonate of 

 ammonia was very nearly 14*6&5 grains. The 

 4-875 grains, driven off by a red heat, I consider 

 as composed of 



1 atom oxygen . . 1 



1 atom carbonic acid . 2*75 



1 atom water . . 1*125 



4-875 



If these suppositions be admitted, the triple salt 

 was a compound of 



3 atoms carbonate of ammonia 1 4'625 

 1 atom percarbonate of uranium 30-75 



4 atoms water . . 4-5 



49-875 



From this analysis it is clear that an atom of 



A 3 



