Cerberus, the Dog of Hades: The History of an Idea

50 ms? This is a handwritten folio number, "50," likely added by a later librarian or researcher for cataloging purposes. The mark beneath it is illegible but may be an abbreviation for "manuscript" or "number."

[This page is a blank leaf, likely serving as a flyleaf or endpaper between the book's binding and the printed text.]