COMMENTARY. We have all along assumed, with our older herbalists, that this is the wakerobin or cuckow-pent, namely, the _Arum maculatum_ L. Pliny and Mesue are the only ancient authors who have noticed its purgative powers. Our author’s account of its faculties is much the same as that given by Dioscorides, Galen, and Oribasius, and its ancient character has been amply confirmed by modern authority. The Arabians treat of it fully, but rather confusedly, under the name of _Luf_. See Avicenna (ii, 2, 432); Serapion (c. 43); Ebn Baithar (ii, 246.) Even at the present day it is not wholly excluded from the Materia Medica. See Pereira (M. M. p. 811.) We have treated of its congener, the dragon herb, as an article of food, in another place. See Book I, 114. Ἀρσενίκον, _Arsenic_, is possessed of caustic powers. It is used also for depilatories, but if the application be allowed to remain long it affects the skin itself. When burnt its particles become attenuated. * * * * * COMMENTARY. There can be no hesitation in deciding that this is the yellow sulphuret of arsenic, commonly called orpiment, the latter term being a corruption of auripigmentum, the Latin name of it. See Celsus (v, 5.) The ancients used this mineral very freely as an external application, and internally by the mouth, in clysters, and in fumigations. Avicenna recommends arsenic with the gum of pine, in the form of a pill, for asthma. He also speaks highly of a potion containing arsenic and honeyed water. He particularly commends arsenic as an application to herpes esthiomenos of the nose. (ii, 2, 48.) Cælius Aurelianus recommends an injection containing arsenic for ascarides. (Tard. Pass. iv, 7). It was freely used in injections for the cure of chronic dysentery. (See Book iii.) Serapion speaks favorably of it in complaints of the eyes. (§ 381.) Servitor says, that sublimed arsenic is a septic and pungent medicine, which removes the fungous flesh of ulcers, and is a depilatory. He describes minutely the process of subliming and whitening it. Avicenna likewise makes mention of white arsenic. Geber also treats of sublimed arsenic, by which it is clear he meant the factitious oxide with which we are now familiar. (iii, 29.) Ἀρτεμισία, Artemisia, _Mugwort_; both varieties are heating in the second degree, and desiccant in the first. They are composed of subtile particles, so that they break down stones in the kidneys, and suit with fumigations of the womb. * * * * *