On the Animal Calculus. 207 
Cub. of Solution of Sal Tartafy and twenty 
five Drops of Oil of Sulphur 5 the Air which 
rofe from the Gravel, adhering to it in large 
Bubbles, made the Gravel frequently rife to 
the Top of the Liquor. 
6. I put into the (ame Menftruum a Clove 
or Fragment of a Scale of a larger Calculus y 
which was voided the Day before, it was 
,^th part of an Inch thick, and broad ; of 
an alh Colour, fo hard that it was difficult to 
break away its Edges with ones Nail. After 
thirty fix Affufions of this Liquor, it was rot- 
ten as Dirt, tho' it retained its Shape. 
7 . Three hard redifli Gravels, of a third 
Perfon's, which were as big as large Shot 
were after eleven Affufions of the fame Li, 
quor, confiderably more brittle, their Surface 
rotten, and much diminifhed, and after twen- 
ty fix more Affufions, they were wafted to the 
Size of Pins-heads. 
8 . I layed two other Gravel Scones of the 
fame Perfon's, but fomewhat lefs than the form- 
er, to foak in Urine for twenty four Hours^ 
and then poured on eight Affufions of thg 
diflblving Menftruum : The following Night 
they were laid to foak again in Urine, and the 
next Day I poured on faceen more Affufions ; 
4 after 
