American journal of pharmacy . In this lati-tude the tree does not give a resinous exudation, but in Kentucky andfurther South a soft resin exudes by wounding the bark which possesses abenzoic odor and taste, and is used in the Western States for chewing, 262 METHOD OF IMPARTING A RED COLOR TO BONE. as a masticatory, to sweeten the breath. We havein our possession a specimen of the resin of Liquid-ambar presented by Mr. Wayne of Cincinnati. It con-sists of conglomerated tears, varying in color fromlight yellow to black, and softens when chewed, like/tolu. When boiled with milk of lime, the fil
American journal of pharmacy . In this lati-tude the tree does not give a resinous exudation, but in Kentucky andfurther South a soft resin exudes by wounding the bark which possesses abenzoic odor and taste, and is used in the Western States for chewing, 262 METHOD OF IMPARTING A RED COLOR TO BONE. as a masticatory, to sweeten the breath. We havein our possession a specimen of the resin of Liquid-ambar presented by Mr. Wayne of Cincinnati. It con-sists of conglomerated tears, varying in color fromlight yellow to black, and softens when chewed, like/tolu. When boiled with milk of lime, the filtereddecoction has a light yellow color, and yields a crys-talline precipitate on adding muriatic acid, likebenzoin. These crystals, in hot water, saturateammonia, and the neutral ammoniacal solution pre-cipitates sesquichloride of iron in red flocks. Theyare probably benzoic acid. The figure in the margin gives an idea of thisplapt, and of its close analogy to the oriental species in the shape of its leafand fruit vessels.]. A METHOD OF IMPARTING A RED COLOR TO BONE AND Dr. J. C. Kellermann. The bone to be colored is laid for fifteen to twenty minutes invery dilute cold nitric acid of the strength of a good vinegar;this dilute nitric acid is obtained by mixing fully J a litre of softwater with about 13 grms. of nitric acid. The bone is then im-mersed for fifteen to twenty minutes in a solution of proto-chloride of tin, made by dissolving a piece of the size of a lentilin a pint of water. The objects thus mordanted are then putinto the following red-bath, which must first be heated until itbegins to boil. Red-hath.—For an experiment on the small scale, take 3 to 5grs. of fine red carmine, pour to it 10 to 12 drops of ammonia,and stir it up well until the carmine is dissolved; then add about2 oz. of soft water. In this bath, when heated to boiling, theobjects must be left for about fifteen minutes. The tints ob-tained are more vivid when the boiling of the bath is not
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