COMMENTARY. Galen and Aëtius have not treated of this article. Our author copies from Dioscorides, who, under the name of ἀκακαλὶς, describes it as an Egyptian plant, resembling the myrica (i, 118.) We may therefore conjecture, with considerable probability, that it is merely some species or variety of the tamarix. It does not appear that it is treated of by the Arabians, nor have we found it in the works of Hippocrates or Celsus. Ἀκακία, Acacia is of the third order of desiccants, and of the first of cooling medicines; but if washed, of the second. It is sour and terrene. * * * * * COMMENTARY. Dioscorides describes the acacia as being a thorny tree or shrub, not erect, having a white flower and fruit like lupine, inclosed in pods, from which is expressed the juice that is afterwards dried in the shade (i, 133.) It was much disputed among the older commentators on Dioscorides whether or not this description applies to the _Acacia vera_; but since the time of Prosper Alpinus, it has been generally decided in the affirmative by all scholars, with the exception of Dierbach, who contends in favour of the _A. Senegal_, without any good reason, as far as we can see. This gum was used medicinally by the authors of the Hippocratic collection, who prescribe it as an astringent in hemorrhages, for which purpose it is also recommended by Celsus (v. 1.) Serapion and the others merely copy from Dioscorides and Galen. See in particular Avicenna (ii, 2, 3.) Ἀκαλύφη, Urtica, _the Nettle_; the fruit and leaves are composed of fine particles, and are desiccative without pungency; they dispel and cleanse swellings, loosen the bowels, are moderately flatulent, and therefore incite to venery. * * * * * COMMENTARY. This article is either the _Urtica dioica_, or the _pilulifera_; or both species were comprehended under it. In the modern Greek Pharmacopœia, the _pilulifera_ stands first (p. 164.) Galen, like our author, calls it aphrodisiacal. Macer Floridus recommends it strongly as being calefacient and stimulant. Both Dioscorides and Galen agree in commending it as an expectorant when the chest is loaded with thick humours. The Arabians treat of it at considerable length. See Avicenna (ii, 2, 714); Serapion (c. 150); Rhases (Cont. l. ult.; 152.) Ἄκανθος, Acanthus, _Bears-breech_ (called also Melamphyllon and Pæderos), has discutient and desiccative powers. * * * * *