C'5?4) 
We pat Ida piece of Wood bigger than the former (this be- 
ing stove an inch long) and that (hone very vigoroufly. And 
having; by a few fucks quite deprived it of Light, we left it tn the 
exhaufted Receiver for full half an hour, and then coming into 
the dark room again, we found all had not continued fo ftanch, 
but that Come fmall portion of A t had xnfinuated it felf into the 
Receiver. This we concluded to be but a fmall portion of Jir, 
becaufe the Wood was but vlfible to an attentive Eye. yet, 
that it was really Tome Alt, which was got in, that caufed the 
little glimmering light, which we perceived, may appear by this, 
that it did prefently (as we expected) vaniffi at the firftorfe- 
C'ohc jfuck 5 and then the ^#ir being let into the dark Rfcetoer, 
the included Wood prefently (hone again as before : though I 
fofpeded, I difeerned fome little diminution of its brightnefs 5 
which yet, till further Trials of the like kind, and for a longer 
time, have been made, I dare not affirm. Before the Receiver wa$ 
fufficiently emptied at the beginning of the Experiment made 
with this greater piece of Wood,a fmall leak accidentally fprung, 
which, lettingin a little iir, did fooner than we intended, recall 
the almoft disappearing Light. 
' •" ; V: • S- ' •' . • - ■ ( 
/ Experiment IV. 
T Here is an Experiment of affinity with the former, which 
we thought it not altogether impertinent to try. Bor ha- 
ving obferved on another occafion. That fometimes the Opera- 
tion, which the withdrawing the Ak hath upon a Body included 
in th e Receiver 0 proves more confiderable fome minutes after we 
have ceafed pumping, than immediately after thecxercife is left 
©if, I imagined, that eveninfuch cafes, where the Light is not 
made wholly to disappear (though it be made alraoft quite to 
do fo) by the emptying of the Pneumatical glafs, the fiiffering 
the Body to remain a while there, though without any pumping 
(unlefs now and then a very little to remove the Air, that might 
have Holler* in in the mean time) the remaining Light of the Bo- 
dy might probably be further impaired, if not reduced quite to 
vaniffi. To examine this conje&ure we put in a Body, that was 
mi Wood? which had fome parts much more luminous than the 
i 
