The exact date of this manuscript is May 24, 1908. It was published, in part, as 7.535n6. Unpublished: Whether mathematicians generally, including Cantor and Dedekind, are correct in their views as to what constitutes a true continuum. The three universes of ideas, i.e., arbitrary possibilities, physical things, and minds. Reality and existence perfect and imperfect continua.
Cantor Georg, Continuum, perfect and imperfect Continuum, Dedekind J. W. R., existence, Ideas, Mathematics, recreations of Mathematics, Mind, Possibility, Reality
pp. 1-17, incomplete, with variants