On the Animal Calculus. 199 
fallen from the Kidnies, fo as to make it fit to 
pafs off thro* the Urethra', which it would al- 
fo do with more cafe to the Patient, by hav- 
ing thereby, its Surface and fliarper Points 
fofeened and made mucilaginous, and lefs fti- 
mulating. This is what the fermenting Mix- 
ture I am going to give an Account of, will 
do on fome of the fofeer Scones, but not 
without too many repeated Injeftions, to make 
it pradicable with Safety to the Patient. 
15. That I might with the greater Accura’- 
cy and Readinefs vary and adjuif, as occafioii 
required, the feveral Proportions of the fer- 
menting Mixtures, I divided the Capacity of 
fcveral Glafs VeiTcIs, out of Vv^hich I poured 
the Liquors, into cubic Inches ; making Marks 
with a File on the Outfide of the Glaffes, at 
each Divifion. I divided alfo the Capacity of 
a large Tube into quarter cubic Inches, it was 
half Inch Diameter, and fcaled at one end, [ 
made alfo feveral Divifions on a fliort Tube 
which was \ Inch Diameter, the Capacity of 
each Divifioti containing ten Drops of Oil of 
Sulphur ; fo that by dipping one end of this 
Tube in Liquor to any of thefe Marks, and 
then {fopping the other end with my Finger, 
I could readily take up 10, 20, 30, 40 or 50 
O 4 Drops, 
