URANIUM, C 25 



grains, must be the amount of the water 

 of crystallization. It is equivalent to 17 atoms 

 of water. 



From the above analysis, which was very care- 

 fully conducted, it appears, that the salt is a 

 sesquinitrate composed of 



1^ atom nitric acid . 10-125 

 1 atom peroxide of uranium 28-000 

 17 atoms water . . 1Q-125 



57-25 



7. When the pernitrate of uranium is exposed to 

 heat, it gives out water and nitric acid, and loses 

 the property of dissolving in water. In this state 

 it is probably a neutral pernitrate ; but my ana- 

 lysis of it was not successful. 



8. Sesquisulphate of uranium. To form this salt Anal y sis 



sesquisul- 



I digested percarbonate of uranium in dilute sul- phate of 



, uranium. 



phuric acid lor more than a fortnight, till the 

 acid would dissolve no more of the oxide. The 

 yellow solution, thus formed, was evaporated to 

 dryness by a gentle heat : the saline residue was 

 redissolved in water, and the solution evaporated 

 a second time to dryness in a temperature rather 

 above 212, and kept in that temperature till the 

 yellow residue was reduced to the state of a yel- 

 low powder. No appearance of crystals could 

 be perceived during the evaporation ; but if a 

 portion of sulphuric acid be added to the liquid, 



