COMMENTARY. There can be no doubt that it is the _Brassica Eruca_, L. Dioscorides agrees with our author in setting it down as being aphrodisiacal and diuretic, and Aëtius does the same. The latter proposes to correct its tendency to induce headache by giving it with lettuce. (ii, 169.) Celsus ranks the “eruca” among the things “quæ contrahere semen videntur.” (iv, 21.) The Arabians agreed with the Greeks as to its aphrodisiacal properties. (Casiri, Bibl. Arab. Hisp. i, 336.) See also Serapion (224), Avicenna (ii, 2, 227.) Even down to a late date rocket retained this character. See Rutty (183), and Quincy (109.) It is still cultivated in gardens. See Loudon (Encycl. &c. 744.) Ἐυπατώριον, Eupatorium, _Hemp-agrimony_, consists of subtile particles, and is possessed of incisive powers without manifest heat. Hence it clears away obstructions of the liver, and has also some astringency. * * * * * COMMENTARY. That the _Eupatorium_ of Dioscorides and the other Greek authorities is the _Agrimonia Eupatorium_, will hardly be questioned now by any competent judge who has investigated the question. Dioscorides recommends its leaves in ill-conditioned ulcers, and its seed and stalk in wine, for dysentery and the stings of reptiles. (iv, 41.) Galen makes it to be deobstruent and tonic. Serapion copies from Dioscorides and Galen, and merely adds, in the end, from Rhases, that southernwood is more suitable in complaints of the liver; and from Mesue, that it is good in protracted fevers. (De Simpl. 77.) Avicenna’s chapter on Eupatorium is entirely compiled from Dioscorides, Galen, and Serapion, without the slightest change or addition. (ii, 2, 239.) No one who has examined into the matter can therefore doubt that the Eu. of these two Arabians, was the same as that of the Greeks. The Eupatorium of Mesue, however, has been generally held to be a very different plant, namely, the _Eupatorium Cannabinum_, according to some, from his comparing the leaves to those of the lesser centaury. It is to be borne in mind, however, that the Latin translations of the Arabians are not to be trusted in small matters, and therefore this comparison may be all a mistake. And that the Eu. of Mesue was the same as that of the others, seems highly probable from his recommending it in the same complaints, namely, in obstructions of the liver, and chronic fevers. (De Simpl. 15.) Such is the conclusion to which an impartial examination of the question has brought us. It is but fair to mention, however, that all the old herbalists and writers on the Mat. Med. down to Rutty and Quincy, are against us, and hold that the Eupatorium of Mesue was different from that of the Greeks. See Matthiolus (in Dioscor.); Parkinson (Theatre of Plants); and the commentators on Mesue. Ἐυφόρβιον, Euphorbium, is possessed of caustic powers, and consists of subtile particles like the other juices. * * * * *