Platt, David.  “Transcendence of Subjectivity in Peirce and Whitehead.”  Personalist 49 (Spring 1968): 238-255.

Abstract

Peirce and Whitehead develop a direct access realism in epistemology which transcends the epistemological subjectivism inherent in the tradition of Descartes and Locke where one is imprisoned within the circle of one's own ideas.  Peirce surmounts subjectivity by means of his phenomenological categories, Whitehead by means of the continuity of self and environment through prehension and causal efficacy.  My conclusion is that while they may not succeed completely in their task, they have opened to us the possibilities of a really cogent direct access realism.  [Abstract from The Philosopher’s Index]