First of all the cordials may be divided into two distinct classes, namely: those that contain a deleterious drug or ingredient, other than acohol, the use of which develops into a habit, and exercises remarkably injurious effects upon the consumer, and those whose components are regarded as harmless.

Cordials of the first class naturally would contain a habit-forming drug, the use of which would enslave the consumer to a certain degree, and greatly undermine his moral and physical strength. A type of liqueurs of this kind is represented by absinthe. In the second class may be found all the other liqueurs and cordials which contain fragrant, odoriferous and harmless, in so far as known, flavoring matters. At least these cordials do not contain any alkaloid or resin or other compound capable of forming a habit and inducing the injurious effects spoken of above. They are sweet, fragrant, and have a flavor peculiar to their composition.

Some of the cordials and liqueurs have well-established reputations, are made in the most careful manner, and usually according to secret formulae, and have secured a lasting popularity. As a type of this kind of cordial that made by the Carthusian Monks may be cited namely, Chartreuse.