In applying the bandage, Aëtius directs us to begin above the sore if only one simple bandage is to be used, but if two are necessary, as in fractures, he recommends us to begin at the ulcer and proceed upwards, and in like manner to begin again at the ulcer and roll downwards. He forbids us to loose the bandages oftener than every alternate day; and directs us not to apply water to the ulcer, but to remove the sanies with a soft, dry linen cloth. Celsus describes very accurately the treatment of a recent wound or simple ulcer. He approves, according to circumstances, of bandages, clasps, or sutures, and his directions respecting the application of them are highly important, but too long for our limits. After the sore is dressed he directs us to apply over it a sponge soaked in vinegar, or, if that cannot be borne, in wine or cold water. This practice is deserving of imitation. He says afterwards: “Optimum etiam medicamentum quies est: moveri et ambulare nisi sanis alienum.” Octavius Horatianus directs us to avoid the bath, the fire, the sun, cold air, loud cries, intoxication, venery, and passion, lest these should occasion a rupture of the parts which had adhered. Avicenna with his usual good sense gives judicious directions for the treatment of simple ulcers, but his principles are nearly the same as those laid down by Galen. He defines an ulcer to be “a solution of continuity, attended with a discharge of sanies or pus.” This seems to be an unexceptionable definition. He forbids all oily and watery applications, and recommends us to observe that no body intervene between the lips of the wound when the bandage is applied. Rhases gives similar directions. He condemns the practice of those who put oil into a wound, and who allow the patient to take wine and heating food. Averrhoes lays down similar rules with considerable precision. Haly Abbas and Alsaharavius follow the practice of Galen without the slightest alteration. Considerable difference of opinion has prevailed respecting the nature of the clasps (Fibulæ ἄγκτηρες) recommended by Celsus and other ancient authorities. Rhodius and Le Clerc maintain that no more was meant than a _simple interrupted suture_, but to this opinion we cannot subscribe. (See Le Clerc, Hist. de la Méd. iv, 2, 5, and Fabricius of Aquapendente Œuvres Chirurg. ii, 108.) They would appear to have been metallic clasps of a peculiar construction. SECT. XXXVII.—ON AGGLUTINANTS.