Anahyfts of the Air. 199 
air, and in fome hours 12 cubick inches 
more, in all 29 inches. In nine days it had 
flowly reforbed 21 cubick inches of air. The 
ninth day I poured warm water into the vef- 
fel a; AT, (Fig. 34.) and the following day, 
when all was cool, I found that it had re- 
forbed the remaining 8 cubick inches. Hence 
we fee that warmth will fometimes promote 
areforbing, as well as a generating hare, 
by raifingthe reforbing fumes, as will appear 
more hereafter. 
Half a cubick inch of Oyflerfljell, and a 
cubick inch of oil of Vitriol, generated 32 
cubick inches of air. 
Oyficrjhell, and 2 cubick inches of four 
Rennet, of a Calve’s ftomach, generated in 
4 days ii cubick inches. But Oyjlerfoell, 
with fome of the liquor 0} a Calves ftomach, 
which had fed much upon hay, did not ge- 
nerate air. It was the fame with Oyfterjhell 
and Ox-gall, Urine and Spittle. 
Half a cubick inch of Oyfterjhell and Sevil 
Orange juice generated the firft day 13 cu- 
bick inches of air, and the following days 
it reforbed that, and 3 or 4 more cubick 
inches of air, and would fometimes generate 
again. It was the fame with Limon juice. 
O 4 Oyfter^ 
