Cerussa, White Lead, is refrigerant and emplastic.
Commentary. We have treated of it as a poison in [Book V. § 59.] Alston says: “Our white lead is certainly the Ψιμύθιον of Dioscorides and the Cerussa Plinii” (xviii.) The ancient ceruse consisted of the carbonate of lead which had been exposed to the vapours of vinegar, and was, therefore, little or nothing different from the modern ceruse. Geoffroy’s description of the process is taken, in fact, from Dioscorides. It would appear to have been sometimes administered internally, if, as Dr. Hill remarks, it is an ingredient in the Trochisci albi of Rhases. We have not been able to find, however, this trochisc in Rhases, nor in any of the ancient authorities. Perhaps Dr. Hill confounded it with the Emplastrum album, of which ceruse is an ingredient. (See Galen, De Comp. Med. sec. gen. vi, and Celsus, 222 ad Milligan.) Galen in fact expressly says that ceruse ought not to be administered internally (Meth. Med. iv.) He recommends it as an anodyne collyrium in pains of the eyes (Comment. in App. vi, 31), and as an astringent and soothing application in general. (De Simpl. Med. ix.) Dioscorides describes minutely the preparation of ceruse, and the different kinds of it, but gives its medicinal properties in brief terms like our author. (v. 103.) Celsus recommends it in burns and ulcers (vi, 7), but internally taken he treats of it as a poison (v, 27, 15.) All the other Greek and the Arabian authorities after Galen give ceruse exactly the same characters as we have stated them above. See in particular Serapion (De Simpl. 378); Avicenna (ii, 2, 117); Haly Abbas (Pract. ii, 48); Ebn Baithar (i, 63.) The last of these says of it, that it is useful in the same class of cases as Minium; that dissolved in vinegar, and more especially when mixed up with rose-oil, it is a good application in cephalalgia; that it forms a proper ingredient in collyria for inflammations of the eyes,—and dissolved in a woman’s milk or mixed up with the white of an egg,—that it is dropped into the eye with advantage in such cases.
Ψύλλιον,
Psyllium, Fleawort; the seed belongs to the second order of refrigerants. With regard to heating and moistening powers it holds an intermediate place.
Commentary. Sprengel remarks, that there can be no difficulty about it; it is the Plantago Psyllium L. Dioscorides and Pliny recommend it pounded with hog’s lard as an application to malignant ulcers; Pliny also says that its seed is a good application to the bites of serpents. (H. N. xxvi, 66.) Dioscorides says it cures tumours, arthritic diseases, intestinal hernia, and other complaints, with rose-oil, vinegar or water. It is, he says, a powerful refrigerant. (iv, 70.) Galen and the other Greek authorities give its characters succinctly like our author. Celsus puts it in his list of agglutinative substances (v, 2.) The Arabians recommend it for the same purposes as the Greeks, and also for allaying the inflammation of acute fevers. See Avicenna (ii, 2, 533); Serapion (De Simpl. 230); Ebn Baithar (i, 132); Rhases (Cont. l. ult. i, 567); Mesue (De Simpl. 20.) We have treated of it as a poison in [Book V. § 40]. According to Crantz its poisonous qualities have been exaggerated by Dioscorides. (Mat. Med. iii, 117.) Accordingly we do not find it treated of by the late writers on toxicology. Although it has long ceased to occupy a place in our dispensatory, it has been celebrated in modern times for its medicinal virtues. Platearius commends it highly as a cooling and astringent medicine, in acute fevers, dysenteries, hemorrhages, &c. (De Simpl. Med.) Prosper Alpinus mentions that the modern Egyptians make frequent use of its mucilage as a medicine, and hence he finds fault with Dioscorides and Mesue for setting it down as a poison. (De Med. Ægypt.); and Rutty (Mat. Med. 415.) Its seeds form with boiling water a rich mucilage, which it appears is still much used in India, in catarrh, gonorrhœa, and nephritic affections. Lindley (Veg. Kingd. 643.) A recent authority on pharmacy says of it that its seeds are mucilaginous and purgative. Gray (Suppl. to Pharmacop. 44.)
Ψωρικὸν,
Psoricum, is formed by mixing two parts of chalcitis with one of litharge, triturating them in vinegar, and, having put them into a new pot, by burying them in dung for forty days. It becomes more desiccative, more subtile, and less pungent than chalcitis.
Commentary. Dioscorides and Pliny call it a mixture of cadmia and chalcitis; Galen, Aëtius, and our author say of litharge and chalcitis. Avicenna follows Dioscorides. (ii, 2, 273.) Celsus also directs it to be made of chalcitis and cadmia. (vi, 6, 31.) It derives its name from its being used as an application to parts affected with scabies (psora.) The psoricum has been long unknown in the practice of medicine.