the furface of fuch fragments of Shining Wood^ as I was woat to 
employ: And though fome parts of this large 5///?^r/?aV/ fli'ned 
vividly (for the light was ufually enough, for rotten Wood, infe- 
xionr to that of our Fifli) yet this great piece, being put into a 
conv^mtnt Receiver^ was, upon the withdrawing ot the At de- 
prived of Light, as the fmaller ones had been formerly the re- 
turning Air reftoring its Light to the one, as it had done to the 
other. 
Experiment XIL 
BUt this is not the chief thing I iatended to acquaint you 
with. That being the fuccefs of fome Trials, which we 
made in profecution of chcfe two neighbouring Expeiiments. 
In the ^r/? of thefe I told you, I had been able to try but for 
half an hour or a little more, that a Shining "f'l^ct of Wood^ depri- 
ved in our Engine of Light, would yet retain a difpofition to be 
as it were re-kindled upon the frefh accefsof the Air. Where- 
fore, though T could have wifhed to have made a further Triil 
with the fime kind of Bodies, yet being able to procure none, I 
fubftituted in their room fni^ll pieces of that (hone 
fome of them more faintly, and fome of them more vividly, in 
reference to one another 5 but none as ftrongly, as fome, that I 
could have employed: and having in a very fmall and clear iJfr<f/- 
verSo far drawn off the Air, as to make the included Body dif- 
appear, we fo ordered the niatter, tfeatwekeptout the Air for 
about 24 hmrs and then allovving the Air to re-enter in a dark 
place and late at night, upon its firft admittance the regained 
its Lights 
Experiment XIIL ^ 
THiSjCompared with fome of my former Obfervations about 
PHtrefakion^ put me upon a Trial, which though it mif- 
carried, I fliall here make mention of, that in cafe you, who are 
better furnilht with Glaffes, think it worth while, you may gee 
reiterited by the ^^f/i^/s Operator, Confidcring then,how greac 
an intereft FMtrefaffion hath in the shining of Fijhes^ and Air in 
tke Phanmena of FatrefaSiion^ I thought, it might be fomewfean 
tothepurpofe, CQ takea Fifbj thatwas^ accpjding to the com- 
' ^ mon 
