On the Animal Calculus. 209 
the fermenting Mixture, for Sal Tartar by 
Experiment LXXIV. Vol, I. p. 1 84. contains 
a good Qiiantity of Air. Yet far the greateft 
Quantity of Air arifes from the Calctdus, as 
is evidently to be feen, when two like Quanti- 
ties of this Liquor are poured at the fame time 
into two Gla(s Vcflels, which have, one of 
them, a Calculus in it, and the other none. 
15. Tho' this Menftruum is far from being 
efficacious enough to encourage any one to 
make the Tryal on human Bodies, it requiring 
as wc fee too many repeated Injeftions to dif- 
folve (bme of the fofter kinds of Calculi ; yet 
I thought it not improper to try whether the 
Bladder could bear a Liquor with this Degree 
of Acidity in it $ it being fo mild that it may, 
be taken into the Mouth without Inconveni- 
ence, tho' it fets an auftere Roughnefs on 
the Teeth. 
Experiment V* 
I. T Injeded therefore at three feverll times 
JL thro* a Tunnel and Tube about half a 
Pint of this Liquor into the Bladder of a 
Dog, after which he did not (hew any Signs of 
Uneafinefs ; But when another time a Pine 
P and 
