Oil the Animal Calculus. 233 
Experiment X, 
I. TT 7Hen wc confider the great Quanti- 
W ties of Air that are in our Food, 
whether animal or vegetable (without whidi 
it would be no Food) and at the fame time 
relied on the Difpofition that mofl: of the Li- 
quors which we drink have to depofite tarta- 
rine Concretions, we cannot wonder to fee 
the Urine of fome Perfons fo much difpofed 
to breed the Calculus : Which Quality of 
the Urine feems to arife in a greater Meafurc 
from our Drink than from our Food. Our 
Food, efpecially that which is boiled, being 
more mucilaginous than the greatefl: part of 
the Liquors which we drink, and confequent- 
ly lefs apt to depofite its Tartar ; of which 
Conjedure we have fonae further Confirma- 
tion from hence, viz. that by comparing the 
feveral Airs generated by Diftillation, Fermen- 
tation, or Eftervefcence, from animal and vege- 
table Subftances, with the Airs generated from 
their Tartars, which are Concretions moftly 
from their fluid Parcs, we find that the Tar^ 
tars yield confiderably more Air, than the fo- 
lid Subftances of Animals or Vegetables: 
Which 
