But if Hermagoras himself had had any great acquaintance with these subjects, acquired with long study and training, then it would be supposed that he, from relying on his own knowledge, had laid down some false principles respecting the duty of an orator, and had explained not what his art could effect, but what he himself could do. But as it is, the character of the man is such, that any one would be much more inclined to deny him any knowledge of rhetoric, than to grant him any acquaintance with philosophy. Nor do I say this because the book on the art which he published appears to me to have been written with any particular incorrectness, (for, indeed, he appears to me to have shown very tolerable ingenuity and diligence in arranging topics which he had collected from ancient writings on the subject, and also to have advanced some new theories himself,) but it is the least part of the business of an orator to speak concerning his art, which is what he has done: his business is rather to speak from his art, which is what we all see that this Hermagoras was very little able to do. And so that, indeed, appears to us to be the proper materials of rhetoric, which we have said appeared to be such to Aristotle. VII. And these are the divisions of it, as numerous writers have laid them down: Invention; Arrangement; Elocution; Memory; Delivery. Invention, is the conceiving of topics either true or probable, which may make one's cause appear probable; Arrangement, is the distribution of the topics which have been thus conceived with regular order; Elocution, is the adaptation of suitable words and sentences to the topics so conceived; Memory, is the lasting sense in the mind of the matters and words corresponding to the reception of these topics. Delivery, is a regulating of the voice and body in a manner suitable to the dignity of the subjects spoken of and of the language employed. Now, that these matters have been briefly defined, we may postpone to another time those considerations by which we may be able to elucidate the character and the duty and the object of this art; for they would require a very long argument, and they have no very intimate connexion with the definition of the art and the delivery of precepts relating to it. But we consider that the man who writes a treatise on the art of rhetoric ought to write about two other subjects also; namely, about the materials of the art, and about its divisions. And it seems, indeed, that we ought to treat of the materials and divisions of this art at the same time. Wherefore, let us first consider what sort of quality invention ought to be, which is the most important of all the divisions, and which applies to every description of cause in which an orator can be engaged.