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See also:GAMBOGE (from Camboja, a name of the See also:district whence it is obtained) , a See also:gum-See also:resin procured from Garcinia Hanburii, a dioecious See also:tree with leathery, See also:laurel-like leaves, small yellow See also:flowers, and usually square-shaped and four-seeded See also:fruit, a member of the natural See also:order Guttiferae, and indigenous to See also:Cambodia and parts of See also:Siam and of the See also:south of See also:Cochin See also:China, formerly comprised in Cambojan territory . The juice, which when hardened constitutes See also:gamboge, is contained in the bark of the tree, chiefly in numerous ducts in its See also:middle layer, and from this it is procured by making incisions, See also:bamboo See also:joints being placed to receive it as it exudes . Gamboge occurs in See also:commerce in cylindrical pieces, known as See also:pipe or See also:roll gamboge, and also, usually of inferior quality, in cakes or amorphous masses . It is of a dirty See also:orange externally; is hard and brittle, breaks with a conchoidal and reddish-yellow, glistening fracture, and affords a brilliant yellow See also:powder; is odourless, and has a See also:taste at first slight, but subsequently acrid; forms with See also:water an emulsion; and consists of from 20 to 25% of gum soluble in water, and from 70 to 75% of a resin . Its commonest adulterants are See also:rice-See also:flour and pulverized bark . Gamboge (Cambogia) is a drastic hydragogue cathartic, causing much griping and irritation of the See also:intestine . A small quantity is absorbed, adding a yellow ingredient to the urine and acting as a mild diuretic . Its irritant See also:action on the skin may cause the formation of pustules . It is less active only than croton oil and See also:elaterium, and may be given in doses of See also:half to two grains, combined with some sedative such as hyoscyamus, in See also:apoplexy and in extreme cases of See also:dropsy . Gamboge is used as a pigment, and as a colouring See also:matter for varnishes . It appears to have been first brought into See also:Europe by merchants from the See also:East at the See also:close of the 16th See also:century . |
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