Applications containing arsenic, chalcitis, quicklime, elaterium, sulphur, and alum are mentioned by Oribasius and Aëtius. See in like manner the ‘Euporista’ of the Pseudo-Dioscorides. The myrmecia is generally rendered _formicaria_ by the Latin translators of the Greek medical authors, and _formica miliaris_ by those of the Arabians. Avicenna seems to confound the myrmecia with the herpes. Pollux defines the thymus, or thymium, to be an excrescence about the pudenda, anus, fingers, or face, of a red colour, rough, bloody, and not difficult to remove. The acrochordon, he says, is white at the root, and it gets enlarged at the extremity. The myrmecia he defines to be a hard, rough excrescence of a callous nature, but bloody at its extremity. The acrochordon is thus described by an intelligent modern author: “Est verruca subcutanea durior et asperior, callosa, atque plerumque teres, cute concolor, in basi tenuis, summitatis vero latioris, fabæ magnitudinem raro excedens, juniores maxime infestans.” (Mangeti Bibl. Chirurg. i, 72.) The terms thymus, myrmecia, and acrochordon, have now fallen into disuse. SECT. XVI.—ON GANGLION. Ganglion is a round tumour of a nerve (tendon?) arising from a blow or pressure, in many parts of the body, but particularly in those parts which are moved, such as the extremities of the hands and feet. In this case, says Archigenes, apply quick lime with the grease of geese and turpentine. But Poles uses the medicine from agate stone, and Oribasius the following: of ceruse, of pine rosin, of old oil, of each, oz. j; of ammoniac perfume, of galbanum, of each, oz. j; of wax, oz. iv; or, he says, apply a thick plate of lead, like the vertebræ, and larger than the ganglion, and bind it on; for by its weight this dissolves it in process of time. This we have used. * * * * * COMMENTARY. See Hippocrates (De Artic. xxvi); Galen (Comment., de Med. Simpl. ix); Celsus (vii, 6); Oribasius (De Virt. simpl. ii, in voce Plumbum); Aëtius (xv, 9); Actuarius (Meth. Med. ii, 11); Avicenna (iv, 3, 2, 6); Albucasis (Chirurg. ii, 50); Rhases (ad Mansor. vii, 15: Contin. xxviii.)