“On Shakespear 1630” typifies much of Milton’s poetry. By some miracle never yet explained, at age 24 he managed to get a 16-line encomium included in the Second Folio of the Bard’s collected works, 1632. Quite a coup! And this brand new M.A., never before published, used this brief poem to contradict Shakespeare’s chief rival, the great Ben Jonson, whose 80-line panegyric had graced the First Folio eleven years earlier. Jonson had said that Shakespeare’s monument was this living book, but...