2 34 On the Animal Calculus. 
Which (hews the Aptnels of fluid Mediums, 
for tarcarine Concretions to be formed in. 
And this holds true not only in Urine, and 
fcrmented^Liqiiors, as Wine, but the fame 
may be obferved in moft Waters. Thus I 
find upon tryal that the Incruflations of pe- 
trifying Springs are of a tartarine Nature j as 
are alfo the Incruftations, which ^adhere to 
the Bottom and Sides of Veflels in which 
Water has been frequently boiled. 
2. For three hundred and eighteen Grains, 
or about half a cubic Inch of petrified Incruf- 
tation {xom ihc Cold Bath in Madingly'^ooA. 
near Cambridge being diftilled in the Iron Re- 
tort, Fig, 38. p, 166. Vol. ijl. there arofe 
from it three hundred and twenty fix cubic 
Inches of Air, of which fifty four Cubes loft 
its Elafticicy in fix Days. / 
3. And from a hundred and fix Grains of 
the fame Subftance mingled with Spirit of 
Salt, there arofe in Fermentation feventy two 
Cubes of Air, all which in fcven Days loft its 
Elafticity. 
4. And it was the fame with the Incruftati- 
on of a Tea Kettle, in which Wei! Water 
had been boiled, which Well was dug below 
a Stratum of Gravel into a blue Clay : From 
:^ths 
