OF POTASH. 



1 ; : t >m carbonic acid 2-1 C> 



1 atom potash . 6 



x! atoms water . 2-25 



11 



The water was determined by heating 11 grains 

 of the crystals to redness : the loss of weight was 

 L 2' L 25 grains. 



5. Sesquicarbonate of potash. In a solution 



1-1 bonate, 



of impure carbonate of potash, with which car- 

 bonate of ammonia had been mixed and ammo- 

 nia disengaged, large crystals formed : they were 

 irregular six-sided plates, and seemed composed 

 of a congeries of small crystals, whose form 

 could not be determined. They were translu- 

 cent, had an alkaline taste, and rendered cudbear 

 paper violet. When analyzed they proved a 

 compound of 



ll atom carbonic acid 

 1 atom potash 

 f) atoms water 



16-875 



These crystals were first observed by Dr. Nim- 

 mo of Glasgow, a very ingenious chemical friend 

 of mine, who was so good as to bring them to 

 my laboratory, where their composition was de- 

 termined. 



6. Bicarbonate of potash. The constituents 

 of this well known salt are as follows : 



