URANIUM. 27 



Sulphuric acid 8-020 



Peroxide of uranium 25-339 

 Water . . 3-746 



36-2 



This is equivalent to 



Sulphuric acid 8*862 



Peroxide of uranium 28-000 

 Water . . 4-13 



8-862 approaches nearest to H atom of sulphu- 

 ric acid which weigh 7*5 ; and 4*13 comes near- 

 est to 4\5 which is 4 atoms of water. Hence, it 

 is probable that the salt is a sesquisulphate of 

 uranium mixed with a little bisulphate ; and we 

 may infer that the sesquisulphate of uranium, 

 supposing it pure and dried till it falls to pow- 

 der, is a compound of 



1 atom sulphuric acid 7*5 



1 atom peroxide of uranium 28 

 4 atoms water 4-5 



40 



I repeated this analysis several times with sul- 

 phate of uranium prepared in different ways, and 

 exposed to as high a temperature as it could 

 bear without acquiring a green tinge. Once I 

 obtained a persesquisulphate of uranium, com- 

 posed of 



