COMMENTARY. Dioscorides, like our author, describes three species, of which the first bears a fruit called _cachrys_, a term previously used by Theophrastus and Nicander, and from which the plant has now got the scientific appellation of _Cachrys Libanotis_. The root of this plant is still kept by our apothecaries, although it has long ceased to hold a place in our Dispensatory. See Gray’s Suppl. to the Pharmacop. (80.) The second species is probably the _Ferula nodiflora_. The third cannot be satisfactorily determined. Our old English herbalists give the libanotis the name of “herb frankincense.” (See Parkinson and Gerard.) These libanotides, however, must be distinguished from “the libanotis, called rosmarinus by the Romans,” which was the well-known _Rosmarinus officinalis_, and of which the flower, known by the name of _anthos_, was in frequent use as a medicine in the age of Sydenham, and still retains a place in our Dispensatory. We have been obliged to enter with more length than usual into the general literature of this subject, to prevent the mistake of confounding the _cachrys_ with the _rosmarinus_, which might be readily done, if the distinction now adverted to had not been clearly pointed out. Dioscorides recommends the libanotides for various medicinal purposes, as being emmenagogue, diuretic, and discutient. Our author’s character of them is mostly taken from Galen. The Arabians treat obscurely and confusedly of this subject. See particularly Avicenna (ii, 2, 67); Rhases (Cont. l. ult. i, 71); Serapion (c. 327.) Rhases says of the rosemary, that it is calefacient and attenuant, and hence proves carminative, diuretic, and emmenagogue. In the modern Greek Pharmacopœia the _Rosmarinus officinalis_ stands as the representative of the λιβανωτὶς. (Athens, 1837.) Λιβανωτὸς, Thus, _Frankincense_ is heating in the second order, and desiccative in the first. It has also a slight sub-astringency. The bark of it is perceptibly astringent. It is, therefore, desiccative in the second degree complete. Consisting of thicker matter than the frankincense, and being less acrid, it cures hæmoptysis, dysentery, cæliac and stomachic affections, both externally and when taken internally. The green shoot of it is heating and desiccative in the third degree. It is also somewhat detergent, by which property it cleanses and fills ulcers in the eyes. * * * * *