(6io) 
vwnat a ft ranger or more lafting Compreffion may do in thfc 
Cafe , I had not opportunity to try. 
2. T'he next unlikenefs to be taken notice of betwixt Rotten 
*¥ood and a Kindled Coal, is 0 That the Utter will in very 
few minutes he totally extinguifht by the with -drawing of the Air , 
whereas a piece of Shining Wood , being edited by the abfence 
of the Air, and kept fo for a time , will immediately recover its 
Light , if the Air be let in upon it again within half an hour after it 
was fir ft with drawn. 
The former part of this Ohfervation is eafily proved by the 
Experiments , that have been often made upon &uick Coals 
in the Pncumatical Engine 5, and the truth of the Utter part 
appears by an Experiment about shining Wood made by us in 
Offober laft. Neither is it unprobable , that if I had had. conve- 
niency to try it , I iliould have fouad , that a piece of Shi- 
ning Wood deprived of its light by the removal of the ambient 
Air, would retain adifpofition to recover it upon the return 
of the Air , not onely for half an hour ( which is all that I 
lately averted ) bat for half a day , and perhaps a longer 
time. 
3. The next difference to be mention'd it > that a Live Coal 
■being put into a jmall-clo[e-Glafs , will not continue to burn for ve- 
ry many minutes » 7 but a piece of Shining Wood will continue to fhine 
for \ome whole dayes # 
The firfi part of the Affertionl know you will readily grant, 
and the rather , becaufe it contains matter of fad , without at 
all determining , whether the Coafc not continuing to burn , 
proceeds from its being, as it were, ftifled by its own fmoak 
and exhalations ( which can have no vent in a fmall-clofe- 
Clifs ) or from the want of frefh Air, or from any particu- 
lar caufe , which I muft not here debate $ though I have 
Sometimes made Experiments fomewhat odd to facilitate that 
enquiry. The ether part of our Obfervation may be eafily. 
made out by what I tried upon Shining Wood , fealed up Her- 
metically in very fmall Glarfes, where the Wood did for fe- 
veral dayes ( though I remember not precifely how many ) 
T etain its Light* 
