UUANIUM. 3D 



Now, if we consider it as composed of 



4 atoms phosphoric acid . 14 



2 atoms peroxide of uranium 56 

 1 J atom oxide of copper 7*5 



12 atoms water . . 13-5 



91 



we have very nearly the numbers obtained by 

 Berzelius. The greatest deviation is in the per- 

 oxide of uranium, which, instead of 56, turns out 

 only 54 '2. It is not impossible that it is in the 

 state of protoxide of uranium, instead of per- 

 oxide. Meanwhile, it would seem that the dif- 

 ference between the yellow and the green uran- 

 micas consists in this, that the former is a double 

 sesquiphosphate of uranium and lime, and the 

 second of uranium and copper ; for the consti- 

 tution of uranite from Cornwall may be repre- 

 sented thus : 



2 atoms sesquiphosphate of uranium 66-0 

 1 atom subsesquiphosphate of copper 1 1 

 12 atoms water . . * 13-5 



91 



As the two minerals have the same crystalline 

 shape, and the same constitution nearly, it would 

 appear that lime and oxide of copper are isomor- 

 phous bases. 



Thus the experiments of Berzelius confirm my 



C4 



