192 On the Animal Calculus. 
2. Hence it was found that the Calculm 
and Tartar of Wine did yield more Air in 
Diflillation, than any other Subftanccs, whether 
animal, vegetable or mineral. And it was re- 
markable that a greater Proportion of this new 
raifed Air from thefe two Subftances, was re- 
forbed and loft its Elafticity, in ftanding a few 
Days, than that of any other Parts of Ani- 
mals or Vegetables, which are ftrong Symp- 
toms that the Calculus is a true animal Tar- 
tar. And as there was very confiderably Icfs 
Oil, in the Diftillation of Rhenifli Tartars, than 
there was in the Diftillation of the Seeds and fo- 
lid Parts of Vegetables \ fo I found that this Cal- 
culus contained much lefs Oil, than the Blood 
or folid Parts of Animals. But fome Stones 
which were taken out of a human Gall-blad- 
der yielded in Diftillation more Oil, and 
much Air. — 
5. A fmall Stone of the Gall-bladder, which 
was of the Size of a Pea, was diflblved in a 
Lixivmn of Sal Tartar in feven Days, which 
Lixivium will alfo diflblve Tartar, yet it will 
not diftblve the CalculuSy tho* I boiled a hard 
Piece in it for feveral Hours. 
4. A Qiiancity of Calculus equal to one 
half of what was diftilled, viz. a hundred 
z and 
