ADULTERATION OF POTASSA BY SODA. 219 
We may here remark, in conclusion, that this process, 
which has fully satisfied me, may also be simplified by 
using an alkalimeter with a solution of tartaric acid, satu- 
rated with bitartrate of potassa, instead of test-acid, and 
dividing the alkalimeter in such a manner, that each degree 
shall answer to one grain of pure carbonate of potassa ; for, 
in this case, it is sufficient to neutralize the 100 grains of 
potassa submitted to examination, to note the quantity of 
test-acid employed; to add, also, an equal quantity of test- 
acid, as has been indicated above, and the difference be- 
tween the carbonate of potassa, indicated by the alkalimeter 
and in the tube, will give, by aid of Table lit, the measure 
of the adulteration. 
