Pamphilus to Hermippus.
It has been remarked, my Hermippus, that, though the ancient philosophers conveyed most of their instruction in the form of dialogue, this method of composition has been little practised in later ages, and has seldom succeeded in the hands of those, who have attempted it. Accurate and regular argument, indeed, such as is now expected of philosophical enquirers, naturally throws a man into the methodical and didactic manner; where he can immediately, without preparation, explain the point, at which he aims; and thence proceed, without interruption, to deduce the proofs, on which it is established. To deliver a System in conversation scarcely appears natural; and while the dialogue-writer desires, by departing from the direct style of composition, to give a freer air to his performance, and avoid the appearance of Author and Reader, he is apt to run into a worse inconvenience, and convey the image of Pedagogue and Pupil. Or if he carries on the dispute in the natural spirit of good company, by throwing in a variety of topics, and preserving a proper balance among the speakers; he