C 97 ] 
water ufed in this experiment contains 42I grains of 
volatile fait j and therefore the whole quantity of 
volatile fait driven over by diflillation feems to be 
about fixty-eight grains, which, as the fecond parcel 
was fo much weaker than the firft, is probably nearly 
the whole volatile alkali contained in the water. 
Experiment III. 
Dr. Brownrig, in a paper printed in the Philofophi- 
cal Tranfa&ions, for the year 1765, fhews that a 
great deal of fixed air is contained in Spa water. This 
induced me to try whether I could not find any in that 
of Rathbone-place j which I did by means of the 
contrivanee reprefented in the drawing. 
