pharmacy, a concreted vegetable juice, which tranfuses through the bark of certain trees, and hardens upon the surface.

Gum Arabic. See Gum Arabic.

Gum Seneca, is a gum extremely resembling gum arabic. It is brought to us from the country through which the river Senega runs, in loose or single drops, but these are much larger than those of the gum arabic usually are; sometimes it is of the bigness of an egg, and sometimes much larger: the surface is very rough, or wrinkled, and appears much less bright than the inner substance, where the masses are broken. It has no smell, and scarce any taste. We are not acquainted with the tree which produces it. The virtues of it are the same with the gum arabic; but it is rarely used in medicine, unless as mixed with the gum arabic: the dyers and other artificers consume the great quantities of it that are annually imported here. The negroes dissolve it in milk, and in that state make it a principal ingredient in many of their dishes; and often feed on it thus alone.

Gum Tragacanth. See Tragacanth.

Gum Manna. See Manna.

Other substances known by the name of gums, are as follow.

Gum Aloes, a preparation of aloes, as set down in the London Dispensatory.

It is made thus: Take of succotrine aloes, four ounces; of water, a quart: boil the aloes till it is dissolved as much as may be; and let all by for a night; the resin will be precipitated to the bottom of the vessel; the liquor poured off and strained, being evaporated, will have the gum. The intention of this separation of the resin, is to procure in the gum, a medicine less purgative, but more agreeable to the stomach, than the crude aloes.

Gum Ammoniac. See Ammoniac.

Gum Elemi. See Elemi.

Gum Guaiacum. See Guaiacum.

Gum Lacca. See Lacca.