L. Of medical science there are five species: one, pharmaceutical; a second, manual; a third, conversant about the regulation of the manner of life, and the diet; a fourth, the business of which is to detect diseases; and the fifth is remedial. The pharmaceutical relieves infirmities by means of medicines; the manual heals men by cutting and cauterizing; the one which attends to the diet, gets rid of diseases by altering and regulating the diet; the fourth produces its effects by a thorough comprehension of the nature of the disease; and the last relieves men from suffering by bringing prompt assistance at the moment. Medical science, then, is divided into the pharmaceutical, the manual, the dietetic, the diagnostic, and the remedial.
LI. Of law there are two divisions. For there is a written and an unwritten law. The one by which we regulate our constitutions in our cities, is the written law; that which arises from custom, is the unwritten law. As, for instance, for a man to come naked into the market place, or to wear woman’s clothes, are actions which are not prohibited by any law, and yet we never do them because they are forbidden by the unwritten law. Law, therefore, is divided into the written and the unwritten law.
LII. Discourse is divided into five heads; one of which heads is that which statesmen employ when they speak in the public assemblies; and this is called political. Another division is that which orators use in their written harangues, and bring forward for the sake of display in panegyrics or reproaches, or