A Rational System of Scientific Principles in Their Relation To Ultimate Reality" (1890)*"Philosophy of Knowledge" (1897)*"A Theory of Reality" (1899)*"Philosophy of Conduct" (1902)*"Philosophy of Religion" (2 vols., 1905)* "In Korea with Marquis Ito" (1908)*"Knowledge, Life and Reality" (1909)*"Rare Days in Japan" (1910)==See also==*American philosophy*List of American philosophers==Notes====References==*Jones, Emma C. Brewster.
A Rational System of Scientific Principles in Their Relation To Ultimate Reality" (1890)* "Philosophy of Knowledge" (1897)* "A Theory of Reality" (1899)* "Philosophy of Conduct" (1902)* "Philosophy of Religion" (2 vols., 1905)* "In Korea with Marquis Ito" (1908)* "Knowledge, Life and Reality" (1909)* "Rare Days in Japan" (1910)