OF BISMUTH. 393 



it, when exposed to a red heat, underwent no 

 apparent change, but lost 2*01 grains of weight. 

 Hence, I am disposed to consider the salt as 

 composed of 



1 atom arsenic acid 7'?5 



1 atom oxide of bismuth 10 



2 .atoms water . - 2-25 



20 



7- Chromate of bismuth. This salt was chromate, 

 formed in the same way as the two last, chro- 

 mate of potash being substituted for phosphate of 

 soda. When collected on the filter, washed, and 

 dried, it constituted a fine yellow tasteless pow- 

 der, insoluble in water, and not altering vegeta- 

 ble blues. 18'86 grains of this salt being heated 

 to redness, did not melt, but lost its fine yellow 

 colour, and became light yellowish brown. The 

 loss of weight was 2*364 grains. Hence, the 

 constituents of the salt must be 



1 atom chromic acid . 6'5 



1 atom oxide of bismuth 10 



2 atoms water . . 2-25 



18-75 



8. Oxalate of bismuth. This salt was formed 

 in the same way as the preceding one, substitut- 

 ing oxalate of ammonia for chromate of potash. 

 When collected on the filter, washed, and dried 



