A poem contains the same elements as a prose composition; the difference, therefore, must consist in a different combination of them, in consequence of a different object proposed. According to the difference of the object will be the difference of the combination. It is possible that the object may be merely to facilitate the recollection of any given facts or observations by artificial arrangement; and the composition will be a poem, merely because it is distinguished from prose by metre, or by rhyme, or by both conjointly. In this, the lowest sense, a man might attribute the name of a poem to the well-known enumeration of the days in the several months: Thirty days hath September, April, June, and November, &c. and others of the same class and purpose. And as a particular pleasure is found in anticipating the recurrence of sounds and quantities, all compositions that have this charm superadded, whatever be their contents, _may_ be entitled poems. So much for the superficial form. A difference of object and contents supplies an additional ground of distinction. The immediate purpose may be the communication of truths; either of truth absolute and demonstrable, as in works of science; or of facts experienced and recorded, as in history. Pleasure, and that of the highest and most permanent kind, may result from the attainment of the end; but it is not itself the immediate end. In other works the communication of pleasure may be the immediate purpose; and though truth, either moral or intellectual, ought to be the ultimate end, yet this will distinguish the character of the author, not the class to which the work belongs. Blest indeed is that state of society, in which the immediate purpose would be baffled by the perversion of the proper ultimate end; in which no charm of diction or imagery could exempt the Bathyllus even of an Anacreon, or the Alexis of Virgil, from disgust and aversion! But the communication of pleasure may be the immediate object of a work not metrically composed; and that object may have been in a high degree attained, as in novels and romances. Would then the mere superaddition of metre, with or without rhyme, entitle these to the name of poems? The answer is, that nothing can permanently please which does not contain in itself the reason why it is so, and not otherwise. If metre be superadded, all other parts must be made consonant with it. They must be such as to justify the perpetual and distinct attention to each part, which an exact correspondent recurrence of accent and sound are calculated to excite. The final definition then, so deduced, may be thus worded. A poem is that species of composition which is opposed to works of science, by proposing for its immediate object pleasure, not truth; and from all other species (having this object in common with it) it is discriminated by proposing to itself such delight from the whole as is compatible with a distinct gratification from each component part.