Melville's long poem Clarel: A Poem and Pilgrimage in the Holy Land (1876) was the last full-length book he published. Until the mid-twentieth century even the most partisan of Melville's advocates hesitated to endure a four-part poem of 150 cantos of almost 18,000 lines, about a naive American named Clarel, on pilgrimage through the Palestinian ruins with a provocative cluster of companions.

But modern critics have found Clarel a much better poem than was ever realized. Robert Penn Warren called it a precursor of The Waste Land. It abounds with revelations of...