Anafyfis of the Ait\ 1 6 1 



and inclined the inverted glafs ay, and 

 bolthead almoft horizontally in a large vef- 

 fel of water, that the water might run in- 

 to the glafs a y 5 when it was almoft up to 

 a the top of the bolthead, I then irnmerfed 

 the bottom of the bolthead, and lower part 

 v of the cylindrical glafs under water, rai- 



I at the fame time the end a uppermofh 

 Then before I took them out of the water* 

 I fet the bolthead and lower part of the cy- 

 lindrical glafs a j into the earthen veflel x x 

 full of water, and having lifted all out of 

 the great veifel of water, I marked the fur- 

 face z of the water in the glafs ay. 



If the ingredients in the bolthead^ upon 

 fermenting generated Air, then the water 

 would fall from z to/, and the empty ipace 

 z y was equal to the bulk of the quantity 

 of Air generated : But if the ingredients 

 upon fermentation did abforbe or fix the 

 a£tive particles of Air, then the furface of 

 the water would afcend from z to n y and 

 the fpace z n> which was filled with water,, 

 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, either generated or abforbed, were very 

 M great* 



