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 tained a fine sort of Sal Armoniac for the most part figur'd not unlike the other, when being dissolv'd and filtrated, it is warily coagulated. This new Salt being gently dry'd I put into a wide Glass of water, wherein I had before plac'd a seal'd Weather-glass, that the included Spirit might acquire the temper of the ambient Liquor, and having stirr'd this Salt in the water, though I took it then off the mantle-tree of a Chimney that had had fire in it divers hours before, it did, as I expected, make the tincted Spirit hastily subside and fall considerably low.

Ince if two bodies upon their mixture acquire a greater degree of Cold than either of them had before there is a production of this additional degree of that Quality, it