1 60 Anahfrt of the Air. 



When I would meafure the quantity of 

 this new generated Air, I feparated the bolt- 

 head from the retort, and putting a cork in- 

 to the (mall end of the bolthead, I inverted 

 it, and poured in water to z. Then from 

 another veffel (in which I had a known 

 quantity of water by weight) I poured in 

 water to/ 5 fo the quantity of water which 

 was wanting, upon weighing this veffel a- 

 gain, was equal to the bulk of the new ge- 

 nerated Air. I chofe to meafure the quanti- 

 ties of Air, and the matter from whence it 

 arofe, by one common meafure of cubick 

 inches, eftimated from the fpecifick gravi- 

 ties of the feveral fubftances, that thereby 

 the proportion of one to the other might 

 the more readily be feen. 



I made ufe of the following means to 

 meaiiire the great quantities of Air, which 

 were either railed and generated, or abforbed 

 by the fermentation arifing from the mix- 

 ture of variety of folid and fluid fubftan- 

 ces ? whereby I could eafily eftimate the fur- 

 prifing effe&s of fermentation on the air, viz. 

 I put into the boithead b (Fig. 34.) the 

 ingredients, and then run the long neck of 

 the bolthead into the deep cylindrical glafs ay> 

 2 and 



