Analyfis of the Air. 



and inclined the inverted glafs ay, arl 

 bolthead almoft horizontally in a large vef- 

 fel of water, that the water might run in- 

 to the glafs a y\ when it was almoft up to 

 a the top of the bolthead, I then immerfed 

 the bottom of the bolthead, and lower part 

 y of the cylindrical glafs under water, rai- 

 iing at the fame time the end a uppermoft. 

 Then befote I took them out of the water, 

 I fet the bolthead and lower part of the cy- 

 lindrical glafs a y into the earthen veffel x x 

 full of water, and having lifted all out of 

 the great veficl of water, I marked the fur- 

 face z of the water jn the glafs a y. 



If the ingredients in the bolthead, upon 



fermenting generated Air, then the water 



would fall from z to/, and the empty fpace 



z y was equal to the bulk of the quantity 



of Air generated : But if the ingredients 



upon fermentation did abforbc or fix the 



attive particles of Air, then the furfacc of 



the water would afcend from z to n, and 



the fpace z n, which was filled with watei\, 



was equal to the bulk of Air, which was 



abforbed by the ingredients, or by the fume 



arifing from them : When the quantities of 



Air, cither generated or abforbed, were very 



M great, 





/ 



