Alexander delivers his opinions regarding the treatment of quartans at so great a length that it is impossible to do justice to them in an abridgment. As usual, he animadverts freely upon the doctrines of Galen, whom he finds fault with for recommending desiccants and calefacients in every species of quartan fever; whereas he maintains that when it arises from adust bile, refrigerants are indicated. He strongly commends emetics at the beginning of a paroxysm. He approves of peppers combined with opium, henbane, and other articles. Synesius and Constantinus Africanus admit the distinction made by Alexander, and nearly follow his principles of treatment. Synesius makes mention of wormwood, which, however, had been recommended by Ruffus. (Ap. Aëtium.) Serenus Samonicus also recommends wormwood: “Mira est absinthi cum simplice potio lympha.” Celsus gives minute directions for conducting the treatment in all the stages of the complaint. He thus sums up the remedies which he recommends: “In ejusmodi valetudine medicamenta sunt, oleum, frictio, exercitatio, cibus, vinum.” Serapion mentions black hellebore, agaric, and the lapis lazuli, as medicines which purge black bile. (De Antid. vi, 15.) Averrhoes, however, cautions against using black hellebore for the cure of quartans; expresses himself in dubious terms respecting venesection; and, upon the whole, seems to place his principal reliance in things of a diffusible, attenuant, and penetrating nature. Haly Abbas, Avicenna, and Rhases speak of venesection in much the same terms as Galen, that is to say, they recommend it when symptoms of plethora are present, but say that it may prove prejudicial in any other circumstances. They approve of emetics at the commencement, and of wormwood in the decline of the fever. Avicenna appeals to Galen in favour of the black and white hellebore. Several of Rhases’ authorities in his ‘Continens’ recommend bleeding. They in general approve of the early use of the bath, and of diuretics and sudorifics; and recommend, in the decline of the fever, things of a heating nature, such as pepper, anise, spikenard, ginger, &c.