Obviously, the treatment must be varied as the effect sought alters, and we divide compositions into classes by their most strongly marked characteristics. Different authorities have varied the number of divisions, and I have not felt bound to follow any of them. It seems to me well to assume that the kinds of composition are Exposition, Argument, Description, and Narration; and to take up their examination in this order.
From the classification commonly received this differs in a change of order and in the omission of Persuasion. Some writers, indeed, include here both Criticism and Translation; but Criticism is really a species of exposition, while Translation is whatever sort of composition its original may happen to be. That Persuasion should so long have been retained in the list is curious, although not so strange as might appear from the name. Persuasion, in the strict sense of the term, is of course not a kind of composition, but a quality of style. An argument, an exposition, a narrative, must alike be persuasive to succeed in winning the reader. Indeed, persuasion is a quality essential to all art. In the sense of being that which leads others to submit their personality to the artist, it is necessary to painter, musician, sculptor, and architect, no less than to writer. As used to designate a department of composition, Persuasion has been that which addresses, which appeals to the passions directly.[3] The term is not a happy one, since it would seem that the vocative—the mood of address—might include denunciation, or invective, or praise, as well as persuasion. The obvious explanation of the use of such a division of composition seems to be that it was made to provide a place of dignity for oratory. In the days of our forefathers the art of eloquence held a high station, such as it is not likely to occupy soon again; and it was evidently felt that there should be a separate department for it in formal rhetoric. Persuasion as a division of composition seems to have been provided for oratory, much as a sinecure is established for a court favorite; but since platform eloquence has fallen somewhat into obscurity, it has been realized that Exposition and Argument cover the whole ground. If such a division were to exist still, it would be better to call it Oratory and be done with it; but if there were to be a fifth kind of composition, there is more ground for trespassing on the domain of Narrative and naming it Dramatization.
As a reason for departing from the time-honored custom of putting Description and Narrative before Exposition and Argument, I might perhaps content myself with saying that it is being found by instructors in whose judgment I have the highest confidence that the new order is the better. This is in part due to the fact that inexperienced writers naturally suppose that they can describe and narrate without having had especial training, and it is less difficult to detach them from bad habits of composition, if they begin with a sort of writing in which they have not contracted faults already. To put pupils in advanced composition first upon Description and Narration is apt to be to expose them to the danger of repeating whatever bad literary habits they may have, since it is in these forms of production that they are most likely to have contracted them. Another point of importance is that Description and Narration are so much more attractive and easily emotional than Exposition and Argument. I have already said that technique can be readily mastered only in an unemotional way. The great performers upon musical instruments have almost always been those who were trained technically while they were still so young or so undeveloped that the emotional capabilities of their nature were not matured. There is great danger in allowing the emotions to be aroused while training which is merely technical is going on. Awaken in the pupil all interest in technical perfection which is possible; to excite his emotional interest in subject or sentiment is dangerous, and obstructs his progress in the cultivation of skill in form and technique. Technical facility is gained by work not in itself inspiring, but done with the most patient exactness for the sake of the power it gives.
Assuming, then, that it is convenient to consider composition as being divided into the four sorts named, and that there are sufficient reasons for taking them in the order given, we find it necessary next to define. Making broad definitions, and leaving finer distinctions to be considered later, we may say:—
Exposition is a statement, an explanation, or a setting forth.
Argument is the endeavor to establish the truth or falsity of an idea or a proposition.
Description is the endeavor to present a picture.
Narration is a record of events.
If a traveler, for instance, should write of the Acropolis at Athens, he might treat the subject in any one of several ways. If he discuss its architectural character, its beauty, and the æsthetic feelings of delight which this awakens, if he explain its use, or make statements of any sort about it, he is making an Exposition; if he endeavor to establish the truth or untruth of especial views of its use, of theories of its age, or of any matters subject to controversy, he passes into Argument; if he by words strives to call up in the mind of the reader a picture of that glorious ruin, he is describing it; while, if he tell the story of the temple, he is evidently dealing in Narrative.