( 5ii2 ) 
the diminution of light, after the pump feemed to have 
been imployed for a competent while , appeared fo incon- 
fiderable, (whether becaufe our eyes had leafure to be 
fitted to that dark place, or for what other caufe foeverj) 
that I began to fufpedijthat the inftrument, having been 
managed in thedark^had leaked all the while* Wherefore 
caufing the lights to be brought in, and a Mercurial Gage 
to be put into the Receiver 3 when we were lure that this 
glafs was well cemented on to the Engine, the Candles 
being removedjthepump was feta workagain 5 and then 
opening my eyes, which I had kept clos'd againft the light 
of the Candles, I could percdvCj upon the gradual withs 
drawing of the Air, a dikernible and graduailcfTening of 
the light ; which yet was never brought quite to difappear 
(as l longlinee told you the light of Rotten Wood and 
Gloworms had done^J or to be fo near vanifliing as one 
would have exped:ed 3 though upon the bringing in of 
the Candles again it appeared by the Gage, that the Pump 
had been diligently applied* But the room being once a- 
gain darkened 5 by the hafty increafe of light, that had 
difclofed itfelf in the Veal upon this letting in of the Air to 
theExhaufled Receiver^ it appeared more manifeflly than 
before, that the decrement, thoaghbut flowly made,had 
been confiderable. This tryal we once more repeated 
with a not unlike fuccefs 3 which though it convinced us, 
that the Luminous matter of our included body was more 
vigorous or tenacious than that of mofl other fhining bo- 
dies 5 yet it left us fomedoubtSj that the light would have 
been much more impaired, if not quite made to vanifh, if 
thefubjed of it could have been ktS^pt long enough in our 
Exhaufted Receiver : But the unfeafonable time of the 
night reducing me at length to go to bed^ I could not flay 
to profecut€ this Or any other tryal» 
17* Only, wbilft I was undrefiingj this further O-bfer- 
vationoccur'd, that fuppofing there might be in the fame 
Larder more joints of the fame Veal than one , innobled 
with 
