Analjfts of the Air. 2 1 7 
emitted that quantity of air $ and in two 
hours more it again reforbed what had been 
juft before emitted. The day following it 
continued abforbing, in all 12 cubick in- 
ches : And then remained ftationary for 15 
or 20 hours. The third day it had again re- 
mitted or generated 3 or 4 cubick inches 
of air, and thence continued ftationary for 
five or fix days, 
A like quantity of filings of Iron^ and oil 
of Vitriol, made no fcnfible ferment, and 
generated a very little air •, but upon pouring 
in an equal quantity of water, it generated 
in 21 days 43 cubick inches of air } and in 
3 or 4 days more it reforbed 3 cubick in- 
ches of air 5 when the weather turned warmer 
it was generated again, which was again re- 
forbed when it grew cool. 
ith Of a cubick inch of filings of Iron, 
and a cubick inch of oil of Vitriol, with 
three times its quantity of Water, generated 
108 cubick inches of air. 
Filings of Iron, with (pirit of Nitre, 
cither with an equal quantity of water, or 
without water, abforbed air, but moft with^ 
out water. 
ith Of 
