26 URANIUM, ANTIMONY, CHROMIUM, c. 



and we evaporate cautiously to dry ness, the dry 

 mass appears a congeries of small and ill-defined 

 prisms. 



The dry sulphate of uranium, thus formed, 

 had a fine deep yellow colour and an astringent 

 taste. It strongly reddened vegetable blues. 

 This salt was analyzed in the following man- 

 ner : 



(1.) 36'8 grains of it were dissolved in distilled 

 water: several yellow flocks remained undis- 

 solved these being collected and dried were 

 found to weigh O6 grain. Hence, the portion 

 of the salt dissolved was 36 '2 grains. 



(2.) The aqueous solution was precipitated by 

 ammonia. The yellow precipitate being collected 

 on a filter, and washed with water containing a 

 little ammonia, and then dried, was found to 

 weigh 28 '2 grains. This matter being exposed 

 to a strong red heat in a platinum crucible, was 

 reduced to protoxide of uranium, and weighed 

 24*434 grains; equivalent to 25 '339 grains of 

 peroxide of uranium. 



(3.) The liquid, thus freed from uranium, was 

 supersaturated by nitric acid and precipitated by 

 muriate of barytes. The sulphate of barytes 

 precipitated, being washed, dried, and heated to 

 redness, weighed 23*67 grains, equivalent to 8 '02 

 grains of sulphuric acid. 



(4.) From the preceding experiments it follows 

 that the constituents of the salt are 



