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I placed, in a warm fim-iTiine, a, 

 great number of inverted jars, full 

 of pump water, and collected care-' 

 fully from them all the air yielded 

 by thefe bubbles, which proved to 

 be much worfe than the common 

 air. 



I boiled fome pump water in a 

 pot, in which I had placed a long 

 cylindrical jar, quite full of the fame 

 water: a good deal of air was col- 

 lected at the top of the inverted jar, 

 which was by the heat difengaged 

 from the water. This air proved to 

 be much worfe than common air 3 

 and entirely unfit for refpiration. 



Abbe Fontana has made, fome 

 years ago, a great many expert 

 ments, tending to inveftigate the 

 nature of air contained in different 

 waters. 



SEC, 



