^o6 Analyfis of the Air. 
tuted the new elaftick air were thereby 
thrown off in greater plenty, and perhaps 
with a greater degree of elafticity, which 
might carry them beyond the fphere of at- 
traction of the fulphureous particles. 
This is further illuftrated by Experiment 
94, where filings of Iron and oil of Vitriol 
alone generated very little 5 but the like 
quantities of filings of Iron, with an equal 
quantity of water, generated 43 cubick inches 
of air i and the like ingredients, with three 
times that quantity of water, generated 108 
cubick inches. 
And tho' the quantity of the afeending 
fumes (which v>^as in this cafe of the Walton 
mineral very great) muft needs in their afeent 
abforb a good deal of elaftick air, for they 
will abforb air 5 yet if where the ferment was 
fo much greater, more elaftick air was ge^ 
nerated by the fermenting mixture than was 
abforbed by the afeending fumes; then the 
quantity of new generated air, which I found 
between ^^and ady (Fig. 35.) when I mea- 
fured it, was equal to the excefs of what was 
generated above what was abforbed. 
And probably in this cafe the air was not 
abforbed fo much in proportion to the denfity 
4 of 
