( ^in ) 
Che drmiDtitton of light, after the pump feemed to have 
been itnployed for a competent while , appeared fo incon- 
fiderable, (whether becaufe our eyes had kafure to be' 
fitted to that dark place, or for what other caufe foever,) 
that I began to fufpedsthat the inftrument, having been 
managed in the dark^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 fure that this 
glafs was well cemented on to the Engine, the Candles 
being removed^the pump was fet a work again ^ and then 
opening my eyes, which I had kept clos'd againft the light 
of the Candles, I could perctive, upon the gradual witb 
drawing of the Air, a difcernible and gradual Icflening of 
the light ; which yet was never brought quite to difappear 
(asllong fioce told you the light of Rotten Wood and 
Gloworms haddouej or to be fo near vanifliing as one 
would have expeded 5 though upon the bringing in of 
the Candles again it appeared by the Gage, that the Pump 
had been dih'gently applied* But the room being once a- 
gain darkened 5 by the hafty incrcafe of light, that had 
difclofed it felfin the Veal upon this letting in of the Air to 
the Exhaufled Eleceiverj it appeared more manifeflly than 
before, that the decrement, though but flowly made^had 
been cortfidcrable. This tryal once more repeated 
with a not unlike fuccefs ^ which though it convinced us, 
that the Luminous matter of our included body was more 
vigorous or tenacious than that of moA other fliining bo- 
dies 5 yet itleft us fomedoubtSj that the light would have 
been much more impaired, if not quite made to vanilh, if 
thefubjed: of it could have been kept long enough in our 
Exhaufted Receiver : But the unfeafonable time of the 
night reducing me at length to go to bed^ I could not ftay 
to profecute this or any other tryaU 
17* Only, whilft I was undreffingj this further Obfcr- 
vationoccur'd, that fuppofing there might be in the lame 
Larder more joints of the fame Veal than one, innobled 
with 
