American journal of pharmacy . rhizome a thin pith ; odor aromatic, heavy; taste bitter. It will be noted in the above description that the only distinctionmade between the root and rhizome is that the latter lias a thinpith. Professor Rothrock (Am. Jour. Phar., 1884, p. 130) calls atten-tion to two structural characteristics of stems and roots, which, he lO Gelseinium. Am. Jour. , 1897. says, are peculiar and of positive value. The first of these char-acteristics, he says, is derived from the medullary rays. Theseusually widen in a marked manner, going from centre to circumfer-e
American journal of pharmacy . rhizome a thin pith ; odor aromatic, heavy; taste bitter. It will be noted in the above description that the only distinctionmade between the root and rhizome is that the latter lias a thinpith. Professor Rothrock (Am. Jour. Phar., 1884, p. 130) calls atten-tion to two structural characteristics of stems and roots, which, he lO Gelseinium. Am. Jour. , 1897. says, are peculiar and of positive value. The first of these char-acteristics, he says, is derived from the medullary rays. Theseusually widen in a marked manner, going from centre to circumfer-ence, being sometimes much more than twice as broad externally asinternally. The second characteristic is the tendency of the pith tobe penetrated by several plates of large, thin-walled cells, whichdivide the pith more or less perfectly into four portions. This lat-ter characteristic is always present and plainly enough marked toserve as a means of diagnosis. This, the author seems to indicate, is a characteristic of the stem. Otx Fig. 2.—Gelsemium, Powder of rhizome. «, wood tissue ; b, cell frommedullary ray ; c, cork cells ; d, bast ; e, parenchyma of cortex. and root. It is possible he may have meant by the stem the under-ground stem or rhizome, for the stem is not official. In either case,whether the stem or rhizome is intended, the statement is-inaccu-rate and misleading, because it does not make distinction betweenthe stem (or rhizome) and root. The United States Dispensatoryquotes this description of Professor Rothrock, and does not clear upthe ambiguity and inaccuracy. None of the text-books make anymore definite and lucid description of the root and rhizome of thisplant. From the growing plant and from the commercial drug numeroussections have been made and examined microscopically. The ac- Am. Jour. , 1897. } GelseviiuiH. I I companying drawings may, perhaps, more clearly and more brieflydescribe these three parts of the plant than any written descrip
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