I 
On the Animal Calculus. 217 
rine, and put therein the Gravel of feven dif- 
ferent Perfons, and then fet the Flask in hot 
Dung, where it had a Heat equal to that of 
Blood \ but they had very little Mucus on 
them in fix Days, fo that this fmall Proporti- 
on of Urine feems to be fome hindrance to 
Diffolution. 
5. What I had principally in view in mak- 
ing thefe laft mentioned Experiments, was to 
fee whether we might have any reafonable 
Expedation of wafting in fome Degree, Gra- 
vel Stones, by a continued Series of Diure- 
tics 5 but they give us very little Encourage- 
ment to hope for any other Succefs from 
thence, than barely the wafliing down of the 
Gravel if not grown too large. It feems in- 
deed probable that while Diuretics are ufing, 
the Gravel or Stone may make a very little if 
any Progrefs in increafing in bulk, becaufe 
at that Time, the Urine is more dilated and 
lefs rancid and urinous ; and confequendy noc 
fo much charged with tartarine Particles : For 
it is obferved that as thofe of a hot Tempera- 
ment, and of the hardieft Conftitutions, have 
the moft rancid Urine, fo they are generally 
3more fubjed to the Stone than others: Not 
pKly becaufe they are fuppofed to perfpire the 
waa*y 
