Avicenna gives a clear and comprehensive exposition of the doctrines of the Greeks, but supplies no new information. He is at pains to explain that the term phlegmon applies generally to every inflamed part; and also to a hot aposteme in particular. He joins Galen in recommending a free incision when it is apprehended that the member in which it is seated will become corrupted. Serapion’s treatment is nowise dissimilar. A phlegmon, says Haly Abbas, is a sanguineous collection, arising either from an external cause, such as a bruise, a blow, a wound, or the like, or from an internal cause, namely, a defluxion upon the part. He attributes the collection which takes place in a part to its debility, which makes it unable to cast off the load which is thrown upon it. When seated in a vascular part, phlegmon, he says, is attended with a throbbing pain. He approves of free and bold incisions. Alsaharavius treats of phlegmon at great length, but there is nothing original in his views. Rhases recommends at first bleeding, purging, and applications of a cooling and astringent nature. But when suppuration has commenced he properly forbids depletion, lest it only protract this process. He remarks that phlegmons are often occasioned by disorder of the stomach, and the use of too much food and drink. He recommends in general maturative applications, to which, if necessary, narcotics may be added. SECT. XVIII.—ON EXTERNAL ABSCESSES. If it appear to you impossible to prevent suppuration, boil bread in water and oil, and apply it as a cataplasm; or apply barley flour prepared in like manner; and bathe the part with an infusion of marshmallows. But when the swelling is difficult, either to convert into pus or to dissipate, you may use a cataplasm of dried figs. But sweet and fat figs are to be dissolved by boiling in water, and made like thin honey, and barley flour added to it. And if the swelling is resolved but imperfectly, you may boil with the figs hyssop or marjoram; or, if you wish to increase its strength, add salts to the decoction. But you must attend that the part be not dried too much, for thus will it be rendered hard. If you perceive any such thing, you must boil with the water the root of wild cucumber, or of marshmallows, or of bryony. But the root of the dracunculus is stronger than these and more discutient; and the medicine formed from the dracunculus itself is very discutient. Sometimes, therefore, you may apply decoctions of these things alone; but at other times you may add dried figs, and mix polenta with fat. And the oil of dill is discutient, and adapted for concocting crude humours, and unconcocted swellings. And pitch, more especially the liquid, concocts all hard and unconcocted swellings, when added to the cataplasms. A compound medicine for procuring the discharge of the concocted matter of abscesses, so that often the pus is found on the pledget; and for thoroughly discussing what is not concocted: of pyrites, of levigated