H it is spread. In order to detect the litharge or sugar of lead, a few drops of the solution of yellow orpiment and quicklime should be poured into a glass of wine. If the colour of the liquor change, and become successively dark red, black or brown, it is an evident proof of its being adulterated with lead. As orpiment is poisonous, it would be better to use a few drops of vitriolic acid for this purpose, which should be introduced into a small quantity of the suspected liquor. This will cause the lead to sink to the bottom of the glass, in the form of a white powder. A solution of hepatic gas in distilled water, if added to wine sophisticated with lead, will produce a black sediment, and thus discover the smallest quantity of that poisonous metal; but in pure wine, no precipitation will take place. The following preparation has been proved to be a sufficient test for adulterated wine or cider. Let one dram of the dry liver of sulphur, and two drams of the cream of tartar, be shaken in two ounces of distilled water, till the whole become saturated with hepatic gas: the mixture is then to be filtered through blotting paper, and kept in a vial closely corked. In order to try the purity of wine, about twenty drops of this test are to be poured into a small glass: if the wine only become turbid with white clouds, and a similar sediment be deposited, it is then not impregnated with any metallic ingredients. But if it turn black or muddy, its colour approach to a deep red, and its taste be at first sweet, and then astringent, the liquor certainly contains the sugar, or other