On the Animal Calculus. 219 
thereby lefs vifcid and more dilute. Thus al- 
fo Muft or the unfermented Juice of Grapes 
yields no Tartar $ nor do Wines depofite their 
Tartars to the Sides of Veffels, while they are 
in a thick, turbid, mucilaginous State 5 but 
when by a farther Degree of Fermenr, they 
are fo much diluted as to fall fine, then the 
tartarine Particles being difintangled, do plen- 
tifully adhere to the Sides of Veflels, fo as to. 
form thereby a hard Cruft. And as the Tar- 
tar of Wine is obferved to be the harder, the 
finer and more attenuated the Wine is, fo 
probably the more digefted and attenuated the 
Urine is, the Calculus will be^proportionably 
the harder ; and frequently to a very great 
Degree of Hardnefs, notwithftanding it lays 
conflantly in Urine ; thus the Mortar of Walls 
which are fo fituated under ground as to be 
never dry, is often obferved to be harder than 
that which lays dry ; and thus the Bones of 
Animals, and the woody Subftance of Trees 
harden in a continually moift State : And as 
Naturalifts have obferved that Bones of Ani- 
mals are more compad and harder in hot than 
in cold Climates, fo ’tis probable that cateris 
paribus the Calculus may be harder in hoc 
than in cool Gondicutions 5 agreeably to what 
