Analyfis of the Air. 223 



When equal quantities of Water and oil 

 of Vitriol were poured on the fea fait it 

 abforbed 1 5 cubick inches of air 5 but when 

 in the like mixture the quantity of water 

 was double to that of the oil of Vitriol^ then 

 but half fo much air was abforbed. 



Experiment C. 



I will next (hew, 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 VitrioU fer- 

 mented much at firft, and in fome degree 

 for 3 days $ they generated 31 cubick inches 

 of air. The Chalk was only a little diflblved 

 on its furface. 



Yet Lime made of the fame Chalk abforb- 

 ed much air 5 when oil of Vitriol was poured 

 on it, and the ferment fo violent that it 

 breaking theglafs veflels, I was obliged to put 

 the ingredients in an Iron veffel. 



Two cubick inches of frefli Lime, and 

 four of common white wine Vinegar ab- 

 forbed in x i$ days iz cubick inches of air. 



a The 



