{6o6) 
And now , Sk, feemg the vvairt of Shinin^We&d hath kept 
me ever fince I fent you the former Experiments from making 
any New ones on that fubjedt , I fhall ^ by way of amends , fub- 
}oyn fome of the Obfervations , that I heretofore intimated to 
you, IhiA mi^t-oi ihz Re fmbUnce 5 and Differences between a 
Live Cod and a Piece of Shining Wood in perufing of which yon 
^illeafiiy difcern , that to thole Particulars , which my Memo- 
ry and the former Obfervations ^ I had noted down about Light 
and Luminous ^(^iw, hadfaggeftedtome, I have added fome, 
that have been affordeJ me by thofe lateTryals, made in ray 
Engine , whereof I feat you an account. 
RefembUnces, 
The things , wherein I obferved a piece of Wood mi t Bum- 
ing Cm/ tosgree or refcmble each other ^ are principally thefc 
Five. - . ■ . _ ^ ; ; ■ ' ' 
I, Bphof them are Lumin^neSythat is, give Light^as having it 
(if I maj fo [peak ) reading in them, and not like Looking- GlaflTes or 
white Bddies\ which ^ire confpicams onely bj the incident beams of 
the Sun 5 or fome other Luminous Body^ which they reflect^. 
This is evident , becaufe both Shining Wood and a Burning 
Coal , (hine the more vivrdiy , by how much the place , wherein 
they are put 5 is made the darker by the careful exclufioa of the 
tdventitious light. ' Tis true , that the j^oon and appear 
brighteft at or about Midnight^, and yet have, but abdrrowed 
light 5 but ihe difference between thofe Flanets and the Bodies we 
treat off, in reference t^ the difficulty we areconfidering^is obvi- 
ous enough. For ^ though the Beholders eye that looks upon 
thofe Stars; be advantag'd by being in the dark , which enlarges 
the FfipiS of the Eye , yet the Objed it felf is freely expofed to 
the beams of the^^^;^ , which if they were intercepted , thofe 
lianets would (Juickly be darknedj as experience manifefts in 
Mclipfes. 
2 . Both Shining Wood and a Burning Coal ^ need the pre fence 
^f the Air ^ and are too of fuoh a denfity^ to make them continue 
fining. 
This has been prov'd as to a Coaly by what Hong fince pub- 
iij my Fhjftce Mechanical Bxperiments^ where I relate. How 
quickly 
