7. The great variety of articles employed in the productions of different kinds of ardent spirits, must necessarily vary the process of distillation in some particulars; but, in all cases, fermentation and heat are necessary to disengage the alcoholic properties of the saccharine matter, and also an apparatus for condensing the same from a gaseous to a liquid form. In some countries, the _alembic_ is used as a condenser, instead of a worm. The form of this instrument is much like that of the retort; and when applied, it is screwed upon the top of the boiler.
8. Spirits, which come to market in a crude state, are sometimes distilled for the purpose of improving their quality, or for disguising them with drugs and colouring substances, that they may resemble superior liquors. The process by which they are thus changed, or improved, is called rectification. Many distilleries in large cities, are employed in this branch of business.
9. There is, perhaps, no kind of merchandise in which the public is more deceived, than in the quality of ardent spirits and wines. To illustrate this, it is only necessary to observe, that Holland gin is made by distilling French brandy with juniper-berries; but most of the spirits which are vended under that name, consist only of rum or whiskey, flavoured with the oil of turpentine. Genuine French brandy is distilled from grapes; but the article usually sold under that denomination, is whiskey or rum coloured with treacle or scorched sugar, and flavoured with the oil of wine, or some kind of drug.
10. The ancient Greeks and Romans were acquainted with an instrument for distillation, which they denominated _ambix_. This was adopted, a long time afterward, by the Arabian alchemists, for making their chemical experiments; but they made some improvements in its construction, and changed its name to _alembic_.
11. The ancients, however, knew nothing of alcohol. The method of extracting this intoxicating substance, was probably discovered some time in the twelfth or thirteenth century; but, for many ages after the discovery, it was used only as a medicine, and was kept for sale exclusively in apothecary shops. It is now used as a common article of stimulation, in almost every quarter of the globe.