2o6 
On the Animal Calculus. 
Experiment IV. 
j. \ which weighed three hundred 
jLjL and fourteen Grains, after forty nine 
frelh Affufions of the abovemen tioned diffblv- 
ing Menftruum was wafted a hundred and 
thirty four Grains ; but the remaining Nude- 
m o{ this Calculus was fo very hard, that this 
Liquor had no Efted on it. 
2. I diffolved alfo feveral other of the fof- 
ter kind of Calculi and the broken Shells of 
Cloves of others ; but there were many of the 
harder kind, which this Liquor had no fenfi- 
ble EfFed upon. 
3. When a large Calculus was fawn afundcr,' 
and immerfed in the fermenting Liquor, I ob- 
ferved the Air to rife in much greater Quan- 
tity, from the fofter inward part of the Cal- 
culuSy than from the hard polifhed Surface. 
4. As for Gravel Stones I was obliged to 
feveral Perfons who were fo good as to furnifh 
me with 'em, which I made the following 
Experiments upon, viz. 
j. Some fmall Grains of a redifli yellow 
gritty Gravel were crumbled into coarft Sand 
with feven AfFuftons of one cub. Water, t. 
cub, 
