'\.l. , (5§5) 
reft • and having drawn out the Air, ail the others fiif- appeared* 
and even the formerly brighter ones fhone but faintly, when the 
Pneumatical glafs feemed to be exhaufted. But keeping the in- 
cluded Body a while in that unfriendly place, we perceived the 
parts, that had retained light, to grow more and more dim, feme 
of them dif appearing, and that, which was formerly the moft 
confpicuous, being now but juft vifible to an attentive Eye, and 
that fcarce without difpute.For,ifwe had not known beforehand, 
that a fhining matter had been included in the Receiver, perhaps- 
we fhould not have found it out. And he that had the youngeft- 
Eyes in the company could not at all difeern it : (the Air being lee 
in, the Body began, to fhine again.) But this being a .{ingle- Trials 
which the latenefs of the night hindred us from reiterating, is to 
be farther profecuted, and in differing fubftances^ before much 
be built upon it,. 
’Experiment- W 
T He Rtrefatfm or Expanfton of the Air having fo notable 
an operation upon our fhining Wood, I thought it would 
not be amifs to try, what the Compcfiien of the Air would do to 
if. For which purpofe we included a piece of it infuch a little: 
Xnftrument to compreffe, which you may remember to have been* 
devifed and propofed by M. Heck, But though we impelled the: 
Air forcibly enough into the Glafs, yet, by reafon of the thick-, 
nefs requifitein fuch Glades, and the opacity thence arifing, we 
were not able rto, to determine whether or no any change was 
made in the laminoufnefs of the Wood. 
Which I thought the lefs ftrange, becaufe by feme Expert 
meats purpofely devifed (at one of which I remember you were 
prefentv I had long iince obfervei, That even a great pretfujrer 
from a fluid Body, which preflfeth more uniformly againft all the 
Parts* it toucheth of the confiftent^ody, does work a far lefs. 
raamfefl change even on loft or tender fubftances^thanone would, 
expedl from the force wherewith it comprefTeth. 
And were it not, that one contrary oftentimes minds us of an- 
other, I might have forgot, that I had divers thoughts about, 
finding fome good ways of Trying, whether any fuch change o£ 
Texture mighebe difeovered to be.m?de-in the fhining Wood by 
