The apparent absence, in reference or allusion, of Peirce to Frege and of Frege to Peirce, to
work of the one in work of the other, and vice versa, would suggest — probably or even plausibly that
neither Peirce nor Frege were aware of the other's work. It nevertheless seems almost inconceivable
that Peirce and Frege could have been unaware of the the other's work, with circumstantial evidence
available that would favour some likelihood of such awareness. This paper collates and speculates
about the circumstantial evidence that is available.