COMMENTARY. It is the _Platanus orientalis_, L. The seed forms into spherical balls, which are called _Pilulæ_ by Pliny. He recommends them for the bites of serpents and for burns; also when pounded with acrid vinegar, as a styptic for stopping bleeding. (H. N. xxiv, 29.) Pliny, however, merely copies from Dioscorides, who further recommends the leaves boiled in wine in defluxions of the eyes, and as an application to swellings and inflammations; and its rind boiled in vinegar as a gargle in toothache. (i, 107.) Our author is evidently much indebted to Galen, who commends it for the same medicinal purposes, and warns his readers to guard against the down which grows on its leaves, as it may prove prejudicial to the windpipe, eye, or ear, if admitted into them. (De Simpl. viii.) Aëtius, like our author, copies very closely from Galen. Not much additional information can be drawn from the Arabians, who, under this head, do little more than copy from Dioscorides and Galen. See Avicenna (ii, 2, 209); Serapion (c. 142); Ebn Baithar (ii, 422.) Πνεύμων, Pulmo, _Lungs_; those of lambs and swine are believed to cure the skin which has been chafed by shoes. But the lungs of a fox when dried are said to cure asthmatics. The Pulmo marinus, when fresh and pounded, cures gout and chilblains. * * * * * COMMENTARY. Dioscorides, Galen, and Serapion give nearly the same account of the medicinal properties of _lungs_. The _Pulmo marinus_ is the species of _Medusa_ which bears this scientific name. Our author and all the others follow Dioscorides in defining its medicinal properties. (ii, 39.) Πολεμώνιον, Polemonium, _Greek Valerian_ (called by some Philetærium), is attenuate and desiccative. Hence some give the root of it in wine for ischiatic disease, dysentery, and scirrhus of the spleen. * * * * * COMMENTARY. It is the _Polemonium cæruleum_, Greek Valerian. It occurs in the Hippocratic treatises (Hippiatr. 108, ed. Basil), but is not found in the works of Celsus. Dioscorides recommends it to be given for the bites of venomous reptiles, for dysentery, dysuria, sciatica, and diseases of the spleen, and also as a masticatory for toothache. He further mentions that it was used as an amulet for the sting of the scorpion. (iv, 8.) Our author copies from Galen, as does also Aëtius. We have not been able to trace it in the works of the Arabians, with the exception of Ebn Baithar, whose account of it is made up entirely of extracts from Dioscorides and Galen. (i, 186.) Though it disappeared from our Dispensatory long ago, its root is still to be found in the shops of our apothecaries, where it retains the character of being astringent, vulnerary, and anti-dysenteric. See Gray (Suppl. to Pharm. 55.) Πόλιον,