D O C U M E N T 4 6 9 A P R I L 1 9 2 5 7 3 7 Tgm (IsReWW). Freundlich 1977, p. 325. [71 129]. The telegram is addressed: “Einstein Sionista Buenosaires.” [1]Dated by reference in the document. [2]Einstein had arrived in Buenos Aires on 25 March (see Doc. 455, entry for 24 March 1925). [3]The Hebrew University was officially opened on 1 April 1925 (see Jüdische Rundschau, 3 April 1925, and Doc. 470, note 1). [4]The ceremony for the laying of the foundation stone of the Einstein-Balfour Institute of Physics and Mathematics was attended by Lord Balfour, Herbert Samuel, and the representatives of fifty-two European, American, and Asian universities and academies. Sir Arthur Schuster, the representative of the Royal Society, gave a speech, and Judah L. Magnes, director of the Institute for Jewish Studies at the university, read the text of the parchment to be laid under the foundation stone (see New York Times, 4 April 1925, and Jüdische Rundschau, 8 April 1925).