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time, and expences out of their own Purses for the publick good only. Now since the Chymical Oyls, by reason of their great prices are most of them adulterated, and very few of them right good, and that nothing hath been published on this matter, and to leave the buyers of them unexcusable, I shall here add briefly, yet sufficiently the ways to discover these Cheats. First for sweet-scented Chymical Oyls, viz. those of Cloves, Cinnamon, and Sassaphras. Only drop a little of them into fair water, and that part which is true good will sink under the water, but the adulterated part will swim on the top of it. Some others draw deep tinctures from the said Spices with Spirit of Wine highly rectified, and sell them for the Oyls; but these mix with the water throughout, neither swimming, nor sinking. Others more craftily digest with the said tinctures some of the true Oyls, which compound being put into water, will for a time render it white. Another way of sophisticating is with Oyl of Turpentine mixed in great quantity with that which is adulterated; You may easily discover the Oyl of Turpentine by setting it on fire, for it yields abundance of ill-scented smoak, with very little favour of the Herb, Flour, or Seed, &c. and soon takes fire. To correct the ill smell of the Turpentine, they digest it with, and distil it off with Spirit of Wine. Those sophisticated with Turpentine, fired in a Silver Spoon colour it, and quickly diffuse themselves upon a Knife, or Paper. The best way to try by firing, is to put a drop or two of these Oyls on the end of a broad pointed Knife, which being first heated, and then thrust into a lighted Candle, presently take fire, and break out into a flame
