Centaurium, _Centaury_; the root of the great centaury is acrid and heating, with a terrene astringency. It therefore promotes menstruation, kills and expels the fœtus, agglutinates wounds, relieves hæmoptysis, and other affections of the chest. The root of the small centaury is possessed of no powers, but the branches are strongly desiccative, and without pungency. Hence they are applicable in those cases in which the great centaury was mentioned as being useful; and in ischiatic complaints the decoction of it given in an injection evacuates bile and sometimes blood, which affords great relief. * * * * * COMMENTARY. The _Centaurea Centaurium_, L., and the _Erythræa Centaurium_, Pers., would appear to be the greater and less centaury of the ancients. See Parkinson, Sprengel, and the other commentators on Dioscorides. Pliny describes three sorts, but would seem to have fallen into a mistake as to the meaning of a passage in Theophrastus. See Harduin ad Plinii H. N. xxv, 32, and Parkinson (Theatre of Plants, 273.) Dioscorides recommends the greater centaury in the same cases as our author, who abridges him and Galen under this head. He says very particularly of it, that it produces menstruation, and expels the fœtus when applied in the form of a collyrium (tent) to the vagina. (iii, 6.) The Arabians give it the same characters as their Grecian masters. See Avicenna (ii, 2, 158), Rhases (Cont. l. ult. i, 176), and Serapion (c. 202.) Serapion and Mesue likewise recommend the lesser centaury in sciatica, either in a potion to the amount of two drachms, or in a clyster to the amount of three ounces, with oil of sesame. Galen has a whole book on the virtues of the lesser centaury, in which there is a prescription for an extract of it. The ancients had great faith in it for the cure of hydrophobia. According to Galen, (who it may well be supposed had devoted great attention to the study of its virtues), it is possessed of bitterness with some astringency, and is most especially excellent as a deobstruent in obstructions of the liver and scirrhus of the spleen. He mentions that some gave it in a potion for nervous affections, and that in a clyster it relieves sciatica by occasioning evacuations of bile. He also recommends it strongly in the form of a fomentation to ill-conditioned and obstinate ulcers. The lesser centaury (_Erythræa Centaurium_, Persoon) still continues to hold a place in our Dispensatory, but, as Dr. Pereira remarks, “is rarely used by medical practitioners; yet it might be used as an indigenous substitute for gentian.” (Materia Medica, 809.) In the days of Quincy it retained all its ancient characters. (Engl. Dispens. 103.) Galen’s tract on it must have been in great repute anciently, since Serapion has given a translation of the whole of it. It is retained in the modern Greek Pharmacopœia. Κέρας ἀιγὸς,