URANIUM. 3J 



Peroxide of uranium 1-677 or 36-254 

 Barytes . . 0-451 - 975 



2-128 



I suspect that the quantity of peroxide of ura- 

 nium has been underrated in Berzelius' calcula- 

 tion, and that the uraniate of barytes, when 

 pure, is a sesqui-uraniate composed of 



1 J atom peroxide of uranium 42 

 1 atom barytes . . 9*75 



Either this supposition is the true one, or the 

 salt contained a slight excess of barytes, owing to 

 the difficulty of washing it thoroughly: this last 

 is the notion which Berzelius entertains. The 

 composition of the salt may be stated thus : 



1 atom peroxide of uranium 42 



1 atom barytes . . 9'75 + 1-546 



If this statement be correct, there was an excess 

 of 1 %546 barytes, or almost ith of the whole ba- 

 rytes. 



(5.) Berzelius has likewise given us an analysis Analysis of 



* uranmica, 



of uranmica from Autun, well known for its beau- 

 tiful yellow colour. He found its constituents 

 as follows : 



Phosphoric acid 

 Peroxide of uranium 

 Lime 

 Water 



90-479 

 C3 



