THE Oil of Bays, or Oleum Laurinum, is an Oil made of the Bay-Bcrries, by bruising them and letting them stand in warm Water several Days in Balneo Mariae, then distilling by an Alembick; which is barrel'd up to be transported to several Places. That which is mostly sold in France, is brought from Provence and Languedoc, especially from a Place call'd Calingson, near Montpellier, from whence the best is brought. As for that of Provence, it is nothing else but Fat and Turpentine colour'd with Verditer or Nightshade. Therefore use none but that from Languedoc, as being the best of all, when it has all its requisite Qualities, which are to be new, well scented, of a good Consistence, and of a green Colour, tending something towards a yellow; and meddle not with that which is green, shining, liquid and of another Smell than the Bay, such as that of Provence, or what is made at Lyons, Rouen or Paris, by knavish People who have no Conscience, but wou'd impose their Rubbish upon the World for a good Commodity. Such are those who counterfeit and sell Rosin for Scammony, Arcanson for Gum Guajacum, fat Pitch for Benjamin, and Kitchin-stuff discolour'd with green, for Oil of Bays, Turmerick for Saffron Powder, and Honey boil'd up with a Hodge-podge of powder'd Roots for Treacle, and in a Word, all Sorts of Drugs sophisticated to deceive the publick, and to make a better Advantage than their Fellow-traders; which is a Thing I fear too much practis'd all over Europe, as well as in France.