1 90 On the Animal Calculus. 
to defpair of finding fome proper and (afe 
Difiblvent. And we are hereto excited by 
the greateft and .moft knowing Chymifts, 
who do frequently encourage us, not to give 
oyer this Rcfearch ; being fenfible there were 
Menftruums povverful enough to diffolve Me- 
tals and Stones, yet fo mild as not to hurt, or 
offend the tendereft part of the Body. 
2. What more particularly induced me to 
make fome few Attempts in this Matter, was, 
that when I was endeavouring fome time fince 
to analyfe the Air by many Chymio- Statical 
Experiments, among other Trials, I found 
that by .Diftillation, vegetable Tartar, viz, 
that of Wine, contained above five hundred 
times its Bulk of Air, which was a great deal 
more than I found, bulk for bulk, in any the 
fluid or folid Parts of Vegetables. This put 
me upon trying whether it was the fame with 
animal Tartar, viz. The calculus hiimanus. 
5. I was furniflied with Variety of CalcuU 
by the Favour of Mr. Ranb)\ Surgeon to his 
Majejifs Houfhold, F. R. S. 
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