GALVANIZED IRON

is the somewhat fantastic name newly given in France to iron tinned by a peculiar patent proce , whereby it resists the rusting influence of damp air, and even moisture, much longer than ordinary tin plate. The following is the prescribed proce . Clean the surface of the iron perfectly by the joint action of dilute acid and friction, plunge it into a bath of melted zinc, and stir it about till it be alloyed superficially with this metal; then take it out, and immerse it in a bath of tin, such as is used for making tin plate. The tin forms an exterior coat of alloy. When the metal thus prepared is exposed to humidity, the zinc is said to oxidize slowly by a galvanic action, and to protect the iron from rusting within it, whereby the outer tinned surface remains for a long period perfectly white, in circumstances under which iron tinned in the usual way would have been superficially browned and corroded with rust. GAMBOGE; ( Gomme Gutte , Fr.; Gutti , Germ.) is a gum resin, concreted in the air, from the milky juice which exudes from several trees. The gambogia gutta , a tree which grows wild upon the coasts of Ceylon and Malabar, produces the coarsest kind of gamboge; the guttae fer a vera ( Stalagmites cambogioides ) of Ceylon and Siam affords the best. It comes to us in cylindrical lumps, which are outwardly brown yellow, but reddish yellow within, as also in cakes; it is opaque, easily reducible to powder, of specific gravity 1·207, scentle , and nearly devoid of taste, but leaves an acrid feeling in the throat. Its powder and watery emulsion are yellow. It consists of 80 parts of a hyacinth red resin, soluble in alcohol; and 20 parts of gum; but by another analysis, of 89 of resin, and 10·5 of gum. Gamboge is used as a pigment, and in miniature painting, to tinge gold varnish; in medicine as a powerful purge. It should never be employed by confectioners to colour their liqueurs , as they sometimes do.