Mind and nature : selected writings on philosophy mathematics and physics 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