"Letters on Natural Magic addressed to Sir Walter Scott" / "Woodberry (1909) I, 178"
Mabbott made double lines next to the relevant passage in the margins of the photocopied pages from Letters. The marginalia added to the photocopy is in Maureen Mabbott's handwriting. The attached typed note relates to Poe's famous essay "Maelzel's Chess Player," which first appeared in the April 1836 issue of the Southern Literary Messenger. It quotes a passage about the essay from G.E. Woodberry's 1909 biography of Poe.
The penciled marginalia below the typed passage relates to Poe's "critical notice" of William Godwin's Lives of the Necromancers in the December 1835 issue of SLM and also to William K. Wimsatt, "Poe and the Chess Automaton" American Literature 11.2 (May 1939): 138-151.
Papers of Thomas Ollive Mabbott, Special Collections, University of Iowa Libraries; "The Murders in the Rue Morgue," in Collected Works of Edgar Allan Poe, Vol. II: Tales and Sketches, ed. Thomas Ollive Mabbott (Cambridge: The Belknap Press of Harvard University Press, 1978), 521-574.