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(29--)
iecture upon what account it is, that Oyl
of Vitriol heightens the Tincture of Redrose Leaves , since Spirit of Salt, which is a highly Acid Menstruum, but otherwise differing enough from Oyl of Vitriol, does the fame thing. Our Authors Experiments then, as we made them, are thefe ; We took about a Glafs-full of luke-warm Water, and in it immerg'd a quantity of the Leaves of Senna, and presently upon the Immersion there did not appear any Redness in the Water, but dropping into it a little Oyl of Tartar, the Liquor foon difcover'd a Rednefs to the watchfull Eye, whereas by a little of that Acid Liquor of Vitriol, which is like the former, undeservedly called Oyl, such a Colour would not be extracted from the infused Senna. On the other side we took some Red- rose Leaves dry'd, and having shaken them into a Glass of fair Water, rhey imparted to it no Redness , but upon the affusion os a little Oyhof Virriol the Water was immediately turn'd Red, which it would not have been, if instead of Oyl of Vitriol, we had imployed Oyl of Tartar to produce that Colour . That these were Gasiendus his Experiments, I partly remember, and was asthr'd by a Friend, who lately Transcribed them out of Gassendus his Book, which I there-
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