|o 6 Analyfts of the Air. 
it moftly abforbed, but did fometimcs gene- 
rate, and then abforb again : And it was the 
fame with Oil of Vitriol, filings of Iron and 
Water, and New-caftle Coal and compound 
Aqua-fort is and others : viz. At firft, when 
the ferment was brisk, the abforbing fumes 
rofc fafteft, whereby more air was abforbed 
than generated 5 but as the ferment abated, to 
fuch a degree as to be able ftill to generate 
elaftick air, but not to fend forth a propor- 
tionable quantity of fumes, in that cafe more 
air would be generated than abforbed. 
And in Experiment 95? there are feveral 
inftances of the airs being in like manner 
abforbed in lefier degrees, by other ferment- 
ing mixtures : As in the mixture of Spirit 
of Harts-horn with filings of Iron, and with 
filings of Copper: And Spirit of Sal Am- 
moniac with filings of Copper; and alfo 
filings of Iron and Water; powdered Flint 
and Compound Aqua fortis ; powdered Bri~ 
ftol "Diamond with the fame liquor. 
It is probable from Experiment 103 and 
106, where it was found that the thicker 
the fuliginous vapours were, the fafler they 
abforbed the air, that if the above-mentioned 
fermenting mixtures had not been confined 
in clofe veffels, but in the open air/ where 
1 the 
