C H R O N O L O G Y 1 9 2 5 – 1 9 2 6 8 5 9 November 26 Attends lecture by Anatoly Lunacharsky, Soviet People’s commissar for education, on “Neue Kunst und Literatur in Sowjetrußland” at the Blüthner-Saal in Berlin, organized by the Gesellschaft des neuen Rußland. Berliner Tageblatt, 27 November 1925, EE. November 30 Arrives in Utrecht to stay with Betsy Julius-Einthoven and her daughters (Abs. 207). December 2 Arrives in Leyden. Lodges with the Ehrenfests. December 11 Attends the celebrations for the 50th anniversary of Hendrik A. Lorentz’s doctorate at the large auditorium of the Univer- sity of Leyden. Delivers Doc. 128. De Maasbode, 12 December 1925. Attends banquet in celebration of Lorentz’s doctorate jubi- lee at the Hollandsche Maatschappij der Wetenschappen in Haarlem. Algemeen Handelsblad, 12 December 1925, EE. (see Illustration 3). December 15 Returns from Leyden to Berlin. ca. December 26 Doc. 137 is read out at the fourth annual conference of the Verband jüdischer Studentenvereine in Deutschland held in the large auditorium of the Jewish community in Berlin. Jüdische Rundschau, 5 January 1926. 1926 January 7 Presents “Über die Ursache des Mäander-Phänomens bei Flußlaufen,” “Über die Anwendung einer von Rainich gefundenen Spaltung des Riemannschen Krümmungsten- sors in der Theorie des Schwerefeldes,”and Erwin Schrödinger’s paper “Die Energiestufen des idealen ein- atomigen Gasmodells” (Doc. 153). January 13 Arrives in Paris for the seventh session of the ICIC and the inauguration of the IIIC. January 14–17 Attends seventh session of ICIC. January 14 10 A.M.: first meeting of the seventh session. Lunches with Georges Oprescu and Gerhart Schulze- Gaevernitz (Doc. 163). 3 P.M.: second meeting of the seventh session. 6 P.M.: visits German ambassador Leopold von Hoesch (Doc. 163). Attends dinner with Gerhart Schulze-Gaevernitz (Doc. 163).