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I took a picee of Shining Wood, and having wetted it with ä little Com- -mon Water in & ciear Glass, it prescntly lost all its Light.

The like Experiment I tried with Scrong Sprit of Sah, and also with a •Weak Spirit of Sal Armoniack ; but in both, the Light did upon the Wood’sImbibing of the Uqttor prescntly Difappear.

I made the like Tryal with Rectified Qyl of 7 'urpentine, with a not un-like Succeß. The fame Experiment I tried more than once with High <Retfified Spirit of Wm, which did immediately Destroy all the Light of theWood that was Itnmerscd in it; and having put a little of that Liquerwith tny Finger upon a part of the whole piece of Wood that Shene veryVigoroufly, it quickly did, as it were Qucncb the Coal as far as the LiquorReached j nor did it in a pretty while, if ar all regain its Lummufinefs.

y. As a Quick-Coal is not to be Exlingufltd by the Coldneft of the Air,when that is greater than Ordinary; so neithcr is a piece of Shining Woodtabe Deprived of its Light by the fame Quality of the Air.

As much oft his Observacion as concerns the Coal, will be readily Granred,and for proof of the Other part of it, this one Tryal may fuffiee, wbich Istall now relate.

I took a finali piece of Shining Wood , and put it into a Slender Glaß Pipe,Sealed at one end, and open at the other, and plactd this Pipe in a GsassVessel, where I caused to be put a Strongly Frigorifick Mixture of Ice andSah, and having kept it there füll as long as would be Requisite to Freeze?an Aqueous Bodj , I afterwards took it our, and perecived not any sensibleDiminution of its Light. But though the Light of Shining Fijh be Usoally(as far as I have obfirved ) more Vigorous and Durable than that 'of ShiningWood ; yet I cannot sey, that it will hold out against Cold so well as theother: For having ordered one of my Servants to cut off a good large pieceof a Luminous Whiting , and bury it in Ice and Sah , when l called for it inleß than halsten Heur after, I stund it much Stiffened by the Cold, and tohave no Light , that I could diseern in a place Dark enough. And for fearthat this Effect may have proceeded not barely from the Operation of theCold, but also from that of the Salt, I caused another time a piece of Whitingto be put in a Pipe of Glaß Seasd at one end, and having seen it Sbine there,

I looked upon it again, after it had stayed but a Quarttr of an Uour, by myestimare, in a Frigortßck mixture, which the Glaß kept from Touching theFiß) ; and yet I could not pereeive in a Dark place, that it Retained anyLight.

i. The first Dlfftreme 1 obscrved betwixt a live Coal and Shining Woodis, That whereas the Light of the Former is readily Extinguißiable by Com-freßon (as is Obvious in the Practice of soddenly Extinguijhing a piece ofCoalby Treading upon it) I could not find that steh a Comprtjßon , as I couldconveniently give witheut losiag Sight of its Operation, wouldormuch injure the Light, even of final! Fragments of Shining Wood. One ofmy Trials about which I find thu» set down.

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