C A L E N D A R O F A B S T R A C T S 1 9 2 6 9 3 5 583. From Frederick N. Sard New York City, 27 September 1926 Intends to organize a celebration for bicentenary of Newton’s death, sponsored by U.S. universities and corporations. Requests a written contribution by AE, and his agreement to serve as president of an advisory board for the events. TLS. [44 867]. 584. To Frederick N. Sard [Berlin, after 27 September 1926] In response to Abs. 583, has already received too many requests regarding the Newton bicentennial. An article of his will appear in the Manchester Guardian. Is reluctant to accept further participation in organizations requests more precise details. ADftS. [44 868]. Is on the verso of Abs. 583. 585. From Rote Hilfe (Ferdinand Timpe) Berlin, 30 September 1926 Circular letter seeking to prevent the arrest of editor Fritz Rau, accused of treason be- cause of an article about the Soviet film Sein Mahnruf, in which he called for member- ship in the Communist Party. TLS. [45 116]. 586. To the Julius family [Leyden, 4 October 1926] Is in Leyden, wishes to visit them in Utrecht with P. Ehrenfest on 9 October. AKS. [14 224]. 587. From Constantin Carathéodory Munich, 4 October 1926 Otto Blumenthal was extremely happy with the collective fiftieth birthday gift of Gauss’s writings, published in one beautiful volume that turned out a bit expensive. Re- quests 40 M. ALS. [8 344]. 588. From Julie Ansbacher Sanatorium Bühlerhöhe (Bühl), 5 October 1926 Has seen AE’s photograph in a Hamburg newspaper. Reports on Guido Ansbacher’s successful concerts in New York. Alfred Stern will be celebrating his eightieth birthday. ALS. [43 061]. 589. From Florian Werthman Utica (New York), 5 October 1926 As a high school student, has studied relativity and radio transmission. Applying rela- tivity leads him to conclude that radio waves should travel in a curved line around the Earth, and not in straight lines, as skip-distance and Heaviside layer theory predict. ALS. [48 776]. 590. From Georges Oprescu Geneva, 8 October 1926 Reminds that the directors’ committee of IIIC will meet in Paris on 30 October. TLS. [34 934]. 591. From Rote Hilfe (Ferdinand Timpe) Berlin, 8 October 1926 As a follow-up to Abs. 585, encloses a declaration in support of Fritz Rau and the free- dom of speech of members of the Communist Party by Heinrich Mann [45 118], and a second letter by Maximilian Harden [45 119], who is opposed to the proposed protest because of the futility of garnering famous names in support of a cause. TLS. [45 117]. 592. From Conrad F. Roediger The Hague, 9 October 1926 Councilor at the German Legation in the Hague, reminds AE that they met in 1921 at Lord Richard Haldane’s in London. Seeing that AE is in Holland, he wishes to visit him. TLS. [44 787]. 593. From Oskar Frankl Prague, 12 October 1926 Recalls AE’s lecture at Prague Urania a few years ago, and invites him to visit again in winter. TLS. [45 165].