Introduction -- Electricity and gravitation (1921) -- Two letters by Einstein and Weyl on a metaphysical question (1922) -- Time relations in the cosmos, proper time, lived time, and metaphysical time (1927) -- The open world : three lectures on the metaphysical implications of science (1932) -- Mind and nature (1934) -- Address at the Princeton Bicentennial Conference (1946) -- Man and the foundations of science (ca. 1949) -- The unity of knowledge (1954) -- Insight and reflection (1955) -- Notes -- References -- Acknowledgments -- Index.