Angiology is briefly described in the ‘Isagoge’ of Galen. A minute description is given by Albucasis. He recommends the operation as a remedy for inveterate cases of hemicrania, catarrh, and cephalæa. He directs us to shave the hairs about the temples, and to continue to do so until the artery appears. It is known, he remarks, by its pulsation. When it does not readily make its appearance, he recommends us to apply a cloth round the patient’s head, and to rub the place with a rough towel. Then, he says, take a scalpel, and make an incision so as to lay bare the artery, which seize with a hook, and separate from the surrounding parts, and if the vessel is small, cut out a proper piece of it, and allow from three to six ounces of blood to flow. But if the vessel is large, bind it in two places with strong silk threads, or strips of raw cloth (_alhohod_), so that it may not drop out before the wound is consolidated. Then cut out the part between the two ligatures. He directs us to dress the wound as recommended by our author. He also mentions the operation of burning the temporal veins as being one that is less serious than angiology. (Chirurg. ii, 3.) Jesu Haly’s account of the operations of tying and burning the temporal arteries is very distinct. (iii, 25.) Haly Abbas describes the operations of cutting out and burning the temporal vessels in nearly the same terms as our author. (Pract. ix, 70.) Rhases mentions that the celebrated Archigenes recommended the temporal veins to be burnt for epilepsy. (Contin. i.) The veterinary surgeons burnt the temporal veins in diseases of cattle. See Vegetius (Mulomed. ii, 16.)