But he has nothing of the salt and savour of Rochester's more serious poetry, and is at best an elegant versifier, who, in his only considerable original poem, the _Essay on Translated Verse_, thinks justly, reasons clearly, and expresses himself with considerable spirit when the subject requires. The most original feature of his literary character is his preference in a rhyming age for blank verse, which he enforces in theory, but is far from recommending by his practice. In his rhymed pieces he is a better versifier than poet, and in his blank verse the contrary. Milton's eyes were just closed; Shakespeare and Fletcher were still acted; but the secret of beautiful versification, apart from rhyme, seems to have been entirely lost. [Sidenote: John Sheffield, Duke of Buckinghamshire (1649-1721).] Poetry afforded a subject for verse to another noble writer, John Sheffield, successively Earl of Mulgrave, Marquis of Normanby, and Duke of Buckinghamshire (1649-1721), who achieved real if moderate distinction as soldier, statesman, and scholar. As a poet his reputation rests entirely upon his _Essay on Poetry_, which contains many just thoughts expressed in pleasing numbers, although the author's deference to the conventional dicta of criticism leads him into idolatry, not only of Homer and Virgil, but of Bossu. To have fostered the genius of Pope by judicious praise is the highest distinction of 'Granville the polite and knowing Walsh.' Congreve, to be treated more fully as a dramatist, stands somewhat higher than these as an inditer of heroic couplets; but a severer criticism must be passed, if any criticism is needed, upon Pomfret, Duke, Stepney, and the other versifiers of the day who have burrowed their way into the stock collections of poetry. [Sidenote: Andrew Marvell (1621-1678).]