In the general rare books college at Princeton University Library sits a stunning two-volume edition of John Milton that once belonged to Herman Melville. Melville’s tremendous debt to Milton — and to Homer, Virgil, the Bible, and Shakespeare — might be evident to anyone who has wrestled with the moral and intellectual complexity that lends Moby Dick its immortal heft, but to see Melville’s marginalia in his 1836 Poetical Works of John Milton is to understand just how intimately the author of the great American novel engaged with the author of the greatest poem in English. Checkmarks, underscores, annotations, and Xs reveal the passages in Paradise Lost and other poems that would have such a determining effect on Melville’s own work.