LIST OF ILLUSTRATIONS (Illustrations follow p. 214) 1. Mileva Maric and Albert Einstein sit for their wedding portrait in the atelier of Emil Vollenweider in Bern, January 1903. (Courtesy Evelyn Einstein) 2. Conrad Habicht, Maurice Solovine, and Einstein as members of the Olympia Academy in Bern, 1902-1903. (Courtesy Schweizerische Landesbibliothek) 3. The Einstein family in Kramgasse, Bern, 1904. (Courtesy Evelyn Einstein) 4. Mileva and Hans Albert Einstein, with the Kirchenfeld bridge of Bern in the background, 1904. (Courtesy Evelyn Einstein) 5. A "Maschinchen" for the measurement of small quantities of electric- ity, acquired ca. 1920 by Friedrich Paschen, Director of the Physics Institute of the University of Tübingen. (Courtesy Jost Lemmerich) 6. Hans Albert in Aegertenstrasse, Bern, ca. 1908 (see Doc. 152). (Cour- tesy Evelyn Einstein) 7. Hendrik A. Lorentz, ca. 1910. (Courtesy Rijksarchief Noord-Holland) 8. Elsa Löwenthal. (Courtesy Schweizerische Landesbibliothek) 9. Facsimile of postcard from Einstein to Paul Ehrenfest, 2 May 1912, corresponding to Doc. 390. (Courtesy Museum Boerhaave) 10. Einstein sits for his portrait in the atelier of Jan Langhans in Prague, 1912 (see Docs. 434 and 436). (Courtesy The Hebrew University of Jerusalem) 11. Marcel Grossmann. (Courtesy Schweizerische Landesbibliothek) 12. Einstein, seated third from left, with colleagues in Zurich, June-July 1913. Paul Ehrenfest stands second from left. The three women are probably Eva Bruins, Catherine Frankamp, and Sophie Rotszajn-all members of the Wednesday colloquium (see Doc. 457). (Courtesy Schweizerische Landesbibliothek) 13. Einstein, Adolf Hurwitz, and Lisbeth Hurwitz on the balcony of the Hurwitz residence in Zurich, 1913 (see Doc. 274). (Courtesy Schweizerische Landesbibliothek)