20 8 Oh the AnUhal Calculus. 
after which one was wafted and the other very 
rotten ; fo the foaking in Urine does not hin^ 
der Diflblution; 
I diflblved in the fame manner the Gra- 
vel of three other Perfons, which were either 
of an afh Colour, or fuch as feemed to be 
compofed of a coarfe redifli Tandy Grit. ' 
10. But the larger Gravel of two other Per- 
fons, which had probably lain much longer 
a hardening in the Kidnies or Bladder, and 
were covered with a kind of hard Polifli, had 
very little Impreffion made on them by this 
Liquor ; yet fome Gritt came off the Surface 
of one of thefe after eleven AfFufions 5 and 
after thirty more AfFufions, each end was Toft 
and crumbled. But this Liquor made no Im- 
prefFion on the Gravel of the other Perfon. 
1 1. This Liquor difFolved a Piece of Tartar 
in five AfFufions, but a like Piece of Tartar 
lay thirty Hours in the fame Liquor, before 
it was diflblved, when there were no repeat- 
ed AfFufions. 
12. That all the Air Bubbles which arife 
during the Ferment do not arife from the 
Calculus^ is plain, becaufe fome arifes in that 
part of the Glafs Veflel where there is no Cal* 
cuius f thefe Bubbles therefore muft arife from 
the 
