8 6 2 C H R O N O L O G Y 1 9 2 6 April 20 Attends banquet hosted by the American ambassador, Jacob G. Schurman, and his wife, Barbara F. Schurman, in honor of the Scottish philosopher Andrew Seth Pringle-Pattison. Vossische Zeitung, 22 April 1926. before April 21 Attends evening of lectures organized by the Berliner Zion- istische Vereinigung at the Preussisches Herrenhaus. The speakers were Privatdozent Walter Sulzbach, who spoke about “Das Wesen der Nation und das jüdische Volk,” and Kurt Blumenfeld, who lectured on “Der jüdische Volksgedanke als Zeiterscheinung.” Vossische Zeitung, 21 April 1926, ME. April 22 Attends musical soirée hosted by the Czech ambassador, Kamil Krofta, and his wife, ŠtƟpánka Kroftová-Tyl, at which excerpts from operas are performed by Czech artists. Vossische Zeitung, 23 April 1926, EE. April 27 Einstein’s father-in-law Rudolf Einstein dies. Berliner Tage- blatt, 3 May 1926, EE. April 28 Attends reception in honor of James N. Rosenberg, vice- chairman of the American Jewish Joint Distribution Com- mittee, hosted by Bernard Kahn, European director of the committee, prior to their departure for Moscow. Jewish Daily Bulletin, 29 April 1926. May 6 Attends celebrations in honor of Sigmund Freud’s seven- tieth birthday hosted by the Deutsche psychoanalytische Gesellschaft at the Hotel Esplanade in Berlin. Berliner Tageblatt, 7 May 1926, EE. May 17 Attends guest lecture by Bulgarian Professor Kyrill Popoff of the University of Sofia on ballistic problems at the Insti- tute for Applied Mathematics at the University of Berlin. Vossische Zeitung, 19 May 1926, EE. before May 28 Sends his portrait to the Palestine Teachers’ Federation in Jerusalem (Abs. 479). before June 9 Joins board of children’s homes in Elgersburg and Worps- wede, founded by the German branch of the Rote Hilfe. Berliner Tageblatt, 9 June 1926, ME. June 14 Attends reception for Chaim Weizmann hosted by Oskar Wassermann, and lectures on the development of the Hebrew University. Jüdische Rundschau, 18 June 1926.