





1 60 Amlyfis of the Air. 



When I would mcafurc the quantity of 

 this new generated Air, I fcparated the bolt- 

 head from the retort, and putting a cork in. 

 to the (mail end of the bolthead, I inverted 

 it, and poured in water to z. Then from 

 another vcffel (in which I had a known 

 quantity of water by weight) I poured in 

 water to y ; fo the quantity of water which 

 was wanting, upon weighing this vcffel a- 

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

 nerated Air. I chofc to meafurc the quanti- 

 ties of Air, and the matter from whence it 

 arofe, by one common mcafurc of cubick 

 inches, eftimatcd from the fpecifick gravi- 

 ties of the fevcral fubftanccs, that thereby 

 the proportion of one to the other might 

 the more readily be feen. 



I made uie of the following means to 

 meafurc the great quantities of Air, which 

 were cither raifed and generated, or abforbed 

 by the fermentation arifing from the mix- 

 ture of variety of folid and fluid (ubftan- 

 ces, whereby I could cafily cftimatc the fur- 

 prifing effects of fermentation on the air, i)i& 

 I put into the bolthead £ (Fig. 34-0 the 

 ingredients, and then run the long neck of 



the bolthead into the deep cylindrical glafs ay-> 

 2 and 





i 





