The materials of all imitation being thus laid open, nothing now remain'd but to illustrate some particular pleasures which arise either from the relations of different objects one to another, or from the nature of imitation itself. Of the first kind is that various and complicated resemblance existing between several parts of the material and immaterial worlds, which is the foundation of metaphor and wit. As it seems in a great measure to depend on the early associations of our ideas, and as this habit of associating is the source of many pleasures and pains in life, and on that account bears a great share in the influence of poetry and the other arts, it is therefore mention'd here and its effects describ'd. Then follows a general account of the production of these elegant arts, and the secondary pleasure, as it is call'd, arising from the resemblance of their imitations to the original appearances of nature. After which, the design is clos'd with some reflections on the general conduct of the powers of imagination, and on their natural and moral usefulness in life.
Concerning the manner or turn of composition which prevails in this piece, little can be said with propriety by the author. He had two models; that ancient and simple one of the first Græcian poets, as it is refin'd by Virgil in the Georgics, and the familiar epistolary way of Horace. This latter has several advantages. It admits of a greater variety of stile; it more readily engages the generality of readers, as partaking more of the air of conversation; and especially with the assistance of rhyme, leads a closer and more concise ex-
