Anal'yfis of the Aif. 217 
in the like mixture the quantity of Water 
was double to that of the oil of VitrioL 
then but half fo much air was abforbech 
Experiment C. 
I will next fliew, what effe&s feveral Al- 
kaline Mineral bodies had on the air in fer- 
menting mixtures. 
A folid cubick inch of unpowdered Chalk , 
with an equal quantity of oil of Vitriol , fer« 
mented much at firft, and in feme degree 
for 3 days * they generated 3 1 cubick inches 
of air. The Chalk was only a little dilfolved 
on its furface. 
One hundred and forty fix grains, or neat 
one third of a cubick inch of Chalk, being 
let fall on two cubick inches of fpirit of 
fait, 81 cubick indies of air were generated* 
of which 36 cubes were reforbed in 9 days. 
Yet Lime made of the fame Chalk abforb- 
ed much air, when oil of Vitriol was poured 
on it 5 and the ferment was fo violent that 
it breaking the glafs veffels, I was obliged to 
put the ingredients in an Iron velfel. 
Two cubick inches of frefh Lime , and 
four of common white wine Vinegar ab* 
forked in 15 days 22 cubick inches of air, 
Q . 2 
The 
