1^0 Anahfis of the Air. i ^ 
When I would meafure the quantity of 
this new generated Air, Ifeparated the- bolt- 
head from the retort, and putting a cork in- 
to the fmall end of the bolthead, I inverted 
it, and poured in water to z. Then from 
another vcflel (in which I had a known 
I quantity of water by weight ) I poured in 
water to / ; 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 fevcral fubftanccs, that thereby 
the proportion of one to the other might 
the more readily be feen. 
I made ufe of the following means to 
rxieafurc the great quantities of Air, which 
were cither railed and generated, or abforbed 
by the fermentation arifing from the mix- i 
ture of variety of Iblid and fluid fubftan- 
ces, whereby I could eafily eftimate the fur- 
priftng effeds of ft:rmcntation on the air, 
’ I put into the bolthead ^ (Fig. 34. ) the 
ingredients, and then run the long neck of 
the boithead into the deep cylindrical glafs a /, 
2 and 
