Widely praised as a founder of modern semiotics and of the pragmatist tradition in philosophy, Charles S. Peirce (1839-1914) spent over forty years developing a philosophical system that addresses the fundamental problems of Western metaphysics, epistemology, and value theory. Although never formally completed, what emerges from Peirce's writings is a distinctive system that, through an innovative semiotic or theory of signs and cognition, combines a thoroughgoing form of empiricism with a robustly realist metaphysics that emphasizes the mind-independence of laws and other universals. Peirce's Empiricism: Its Roots and Its Originality explains this marriage of empiricism with realism by tracing the roots of Peirce's thought in the history of Western philosophy, with particular attention paid to his predecessors in the empiricist and the common sense traditions. By purging modern empiricism of its nominalistic metaphysics and its Cartesian assumptions about mind and knowledge, and by combining it with insights from sources as diverse as Duns Scotus and Charles Darwin, Peirce reinvents the idea that all our knowledge depends on sense perception while reaffirming the place of philosophy as a foundational field of inquiry. In Peirce's Empiricism, Aaron Bruce Wilson defends an interpretation of Peirce's philosophical work as forming a systematic whole, and develops the connections between Peirce, Reid, and the British empiricists. Wilson provides focused analyses of Peirce's accounts of experience, habit, perception, semeiosis, truth, and ultimate ends. This book will be of great value to students and scholars with interests in Peirce, American philosophy more broadly, modern philosophy, and semiotics.