On the Animal Calculus. 2 1 
E X P E R I M ENT VII. 
I* T Pounded feverally the three following hot? 
X alkaline Plants, viz. Onions^ Scurvy- 
grafs and Horfe-radijh Roots, and put the 
Pulp into three Pots, in the middle of which 
I put very hard Calculi which were all tak- 
en out of the fame Perfon. I prefled the 
Mafli hard down, and fet the Pots in a hot 
Bed for thirteen Days. 
■ 2. The Scurvy-grafs and Horje-radijh had 
no fenfible Effect on their Calculi : But the 
Surface of that which was put into the Oni- 
ons was fo foft that I could fcrape it off with 
my Nail ; and it was the fame when I put a 
like Calculus into Onion Juice mixed with 
Water, which was kept warm in a Chimney 
Corner for fifteen Days ; in which Liquor the 
redifli gritty Gravel of two other Perfons was 
at the fame time diflblved. 
3. Hence Onion Juice feems to have fome 
confiderable Efficacy in diflblving the Calcii^ 
lus : And where frequently eaten (hould, if 
not wafle, at leaft prevent the Increafe of, the 
Calculus. 
P 4 Expe R X- 
