14 URANIUM, ANTIMONY, CHROMIUM, &c. 



(2.) He formed uraniate of barytes by mixing 

 together solutions of permuriate of uranium and 

 muriate of barytes ; caustic ammonia being added, 

 the uraniate of barytes precipitated. It was has- 

 tily washed on a filter with boiling water, to pre- 

 vent the precipitation of carbonate of barytes ; 

 it was then dried and heated to redness, to ren- 

 der it anhydrous. Two experiments were made 

 with two different preparations of uraniate of 

 barytes. I shall state the results of each. 



First. 1*343 of uraniate of barytes gave 0-295 

 sulphate of barytes, equivalent to 0-195 barytes. 

 The protoxide of uranium obtained from the 

 same salt weighed 1-121 ; now, 



Barytes . . 0-1 &5 

 Protoxide of uranium 1-121 



1-316 



The difference between 1 -316 and 1-343 is 0-027, 

 which must be the oxygen driven off when the 

 peroxide of uranium was converted into protox- 

 ide. But 1-121 : 0-027 : : 100 : 2-4085. It 

 appears from this experiment that 100 protoxide 

 + 2-4085 oxygen = 102-4085 peroxide. 



Second. 1-456 uraniate of barytes gave 0-364 

 sulphate of barytes, equivalent to 0-2406 bary- 

 tes, and 1-186 protoxide of uranium. The 

 difference between these weights united, and 

 that of the uraniate is 0-0294, which must be 



