Under this name, a product was a few years since introduced to the notice of the public, which promises, at some future time, to become an important article of commerce, and a useful medicine. it was brought from New Mexico by Dr. Geo. G Shumard, of the U. S. Army, who accompanied an expedition sent by the government into the Indian country, under the command of Captain Marcy. it was obtained from a tree belonging to the same family as the Acacia, which extends through vast regions, and is capable of yielding an unlimited supply to commerce. The juice exudes spontaneously, and hardens on the bark.

As it has come under my notice, it is in irregular roundish pieces, of various size, and of different hues, from colourless transparency to a dark amber-brown. Some of the pieces have the fissured appearance of the Turkey gum. Examined by Professor Procter, it was found to resemble gum arabic in its solubilities, but to differ from that principle in some of its chemical reagencies. Thus, it does not, like that gum, precipitate a solution of Subacetate of lead. (Am. Journ. of Pharm., xxvii. 14 and 223.) Dr. Campbell Morfit, of Baltimore, found it to coincide closely with gum arabic in composition. (Am. J. of Sci. and Arts, 2d sÚr., xix. 263.)

On the whole, it is probable that this gum will be found to answer the same purposes as gum arabic in medicine and pharmacy; and it has this considerable advantage, that it may be mixed, without precipitation, with solution of Subacetate of lead, to which it may thus impart demulcent properties. There is no other known gummy substance of which this can be said.