Here we see the Poet consider'd all the Effects of this Union between Trees of different kinds, and took notice of that Effect which had the most surprize, and by consequence the most delight in it, to express the capacity that was in them of being thus united. This way of Writing is every where much in use among the Poets, and is particularly practis'd by Virgil, who loves to suggest a Truth indirectly, and without giving us a full and open view of it: To let us see just so much as will naturally lead the Imagination into all the parts that lie conceal'd. This is wonderfully diverting to the Understanding, thus to receive a Precept, that enters as it were through a By-way, and to apprehend an Idea that draws a whole train after it: For here the Mind, which is always delighted with its own Discoveries, only takes the hint from the Poet, and seems to work out the rest by the strength of her own Faculties.
But since the inculcating Precept upon Precept, will at length prove tiresom to the Reader, if he meets with no other Entertainment, the Poet must take care not to encumber his Poem with too much Business; but sometimes to relieve the Subject with a Moral Reflection, or let it rest a while for
