In attempting to illustrate these and other aspects of Donne's erudition as displayed in his poetry it has been my endeavour not so much to trace them to their remote sources as to discover the form in which he was familiar with a doctrine or a theory. Next to his own works, therefore, I have had recourse to contemporary or but slightly later works, as Burton's _Anatomy of Melancholy_ and Browne's _Pseudodoxia Epidemica_. I have made constant use of the _Summa Theologiae_ of St. Thomas Aquinas, using the edition in Migne's _Patrologiae Cursus Completus_ (1845). By Professor Picavet my attention was called to Bouillet's translation of Plotinus's _Enneads_ with ample notes on the analogies to and developments of Neo-Platonic thought in the Schoolmen. I have also used Zeller's _Philosophie der Griechen_, on Plotinus, and Harnack's _History of Dogma_. Throughout, my effort has been rather to justify, elucidate, and suggest, than to accumulate parallels. *** In the following notes the _LXXX Sermons &c._ (1640), _Fifty Sermons &c._ (1649), and _XXVI Sermons &c._ (1669/70) are referred to thus:--80. 19. 189, i.e. the _LXXX Sermons_, the nineteenth sermon, page 189. References to page and line simply of the poems are to the first volume of this edition. References to the second are given thus, II. p. 249. THE PRINTER TO &c. See _Text and Canon of Donne's Poems_, p. lix. PAGE =1=, ll. 17-18. _it would have come to us from beyond the Seas_: e.g. from Holland. ll. 19-20. _My charge and pains in procuring of it_: A significant statement as to the source of the edition. PAGE =3=. _Hexastichon Bibliopolae._ l. 1. _his last preach'd, and printed Booke_, i.e. _Deaths Duell or a Consolation to the Soule against the dying Life and living Death of the body. Delivered in a sermon at Whitehall, before the Kings Majesty in the beginning of Lent 1630, &c. ... Being his last Sermon and called by his Majesties household the Doctors owne Funerall Sermon. 1632, 1633._ This has for frontispiece a bust of Donne in his shroud, engraved by Martin Dr[oeshout] from the drawing from which Nicholas Stone cut the figure on Donne's tomb (Gosse's _Life, &c._ ii. 288). Walton's account of the manner in which this picture was prepared is well known. See II. p. 249. PAGE =4=. _William, Lord Craven, &c._ This is the younger Donne's dedication. See _Text and Canon, &c._, p. lxx. William Craven (1606-1697) entered the service of Maurice, Prince of Nassau in 1623. He served later, 1631, under Gustavus Adolphus; and became a devoted adherent of Elizabeth of Bohemia and the cause of the Palatine house. He lost his estates in the Rebellion, but after the Restoration was created successively Baron Craven of Hampsted-Marsham, Viscount Craven of Uffington, and Earl of Craven. He was an early member of the Royal Society.