The poetic canon of William Herbert, third Earl of Pembroke, is extremely uncertain. The younger John Donne, who edited Pembroke's Poems (1660), is ambiguous about the sources of the manuscripts he used: in his dedication to Christiana Cavendish, Countess of Devonshire, the editor claims that he used manuscripts from her hand; in the preface to the reader, he states that the poems were from Henry Lawes and Nicholas Lanier. Gaby E. Onderwyzer speculates that the poems on the first twenty-eight pages may be from Christiana, with the poems in the remainder of the volume (which has poems by Pembroke mixed with unattributed poems by Sir Edward Dyer, Henry Wotton, Sir Walter Ralegh, Henry King, Thomas Carew, John Corbet, John Grange, Sir Thomas Nevill, and William Strode) possibly supplied by Lawes and Lanier. The British Library Catalogue ascribed Of the Internal and Eternal Nature of Man in Christ (1654) to Pembroke...