COMMENTARY. It is still by no means satisfactorily determined what tree it is which produces the frankincense; but the best authorities are now inclined to think that it is the _Boswellia turifera_. See Pereira (Mat. Med., 1185); Ainslie (Mat. Ind. 78); and Lindley (Veg. Kingd. 459.) Dioscorides says the best kind of incense is “the male,” by which the ancients meant the purest kind of it, or that consisting of the larger grains. See Gray (Pharmacop. 200.) The Indian is of an inferior quality. He calls it heating, astringent, and cleansing; and recommends it in hemorrhages, recent wounds, burns, chilblains, and other diseases of a like nature. He gives minute directions for the use of it in fumigations. The bark of the frankincense tree he recommends in fluxes and hemorrhages, and in ulcers of the eyes. The _manna_ of frankincense will be explained by us under that head. (Mat. Med. i, 81-3.) Oribasius gives a perfectly similar account of the frankincense; indeed, he avowedly copies from Dioscorides. (Med. Collect. xi.) Our author’s account is mostly taken from Galen. On the _Thus_ see further Pliny (H. N. xii, 30) and Rhases (Contin. xxxvii, § 716.) Most of the ancient authorities affirm that it acts beneficially in mental disease, that it sharpens perception, and improves the memory. They also recommend it in fumigations for removing the pestilential constitution of the atmosphere, as we have stated in the Second Book. Symeon Seth, mostly borrowing from Galen and our author, says, under the head of frankincense, that it is of a drying nature, with a certain astringent quality; that it binds the bowels; in fumigations helps coughs and defluxions; is emmenagogue both when drunk and applied per vaginam; that in fumigations it is possessed of powers for averting the pestilence; and hence in a pestilential season that houses should be diligently fumigated with it, in order to correct the pernicious quality of the air. The Arabians used it very freely as an ingredient in their applications to ulcers, including those of the eyes. See Avicenna (ii, 2, 525) and Serapion (c. 278.) Averrhoes, like preceding authorities, recommends the bark in fluxes, hæmoptysis, and ulceration of the intestines. (Collig. v. 42.) The frankincense occurs frequently in the treatises contained in the Hippocratic collection, and in the works of Celsus. The latter used all the kinds mentioned by the Greeks, such as, “thus masculum,” “fuligo thuris,” and “cortex thuris.” These he uses for the same purposes as the Greeks, that is to say, for suppressing bleeding, concocting pus, cleansing sores, and so forth. Λιγνὺς,