C A L E N D A R O F A B S T R A C T S A P R I L 1 9 2 8 8 4 9 495. From Otto Everling Berlin, 24 April 1928 Attaches copy of the letter of the Schutzkartell to the Reichsarbeitsminister on its pro- posal for a representative at the International Labour Office, made in agreement with the Gewerkschaft Deutscher Geistesarbeiterverbände. TLS. [46 403]. That organization proposes its own president, O. Everling ([46 404]). 496. From Bruno Meyermann Göttingen, 24 April 1928 A new comparison of the motions of Mercury and the Moon measured in terrestrial and inertial times proves that there are irregular fluctuations in the Earth’s rotation. A new reduction of the elements of Mercury by using observations reduced to inertial time would give new data, especially for the motion of its perihelion. TLS. [17 181]. 497. From Sigmund Wassermann [Haifa?,] 24 April 1928 Invites AE to the committee of the Verein der Freunde der Hebräischen Realschule in Haifa (see also Abs. 443). Attaches statutes ([46 598]). TLS. [46 599]. 498. From Zentralkommitee der Internationalen Arbeiterhilfe Berlin, 25 April 1928 Solicits signature to the appeal by Soviet Belorussian scientists and writers against the Polish oppression of West Belorussian education and culture ([46 782]). TLS. [46 781]. 499. To Bernhard Dernburg Berlin, 26 April 1928 Is suffering from a severe heart condition and will be unable to accept the invitation for the 6th of May. TLS. [76 933]. 500. To Sigmund Wassermann [Berlin, 26 April 1928] Accepts the election to the committee of the Reali School in Haifa, hoping that it will be a useful institution. ADftLf in HD’s hand. [46 600]. 501. From Léon Rosenfeld Göttingen, 26 April 1928 Intends to apply for a fellowship of the International Education Board in order to study next year for a semester in Berlin under AE’s supervision. He works on the relationship between quantum mechanics and the theory of relativity. Requests brief letter of support. ALS. [48 153]. 502. From August Schulenberg Berlin, 26 April 1928 Encloses a manuscript on the essence of radiating energy. Offers further explanations, if necessary, and requests a short reply. TLS. [25 270]. 503. From Henrik G. Söderbaum Stockholm, 26 April 1928 On 11 April, the Royal Academy of Sciences in Stockholm elected AE foreign member. TLS. [30 233]. 504. From Gewerkschaft Deutscher Geistesarbeiterverbände Berlin, 27 April 1928 In summing up AE’s discussion with F. Rasenberger-Koch, they do not accept O. Everling’s candidature for representative at the International Labour Office. Asked him to send his publications on problems of intellectuals to learn about his activities. Com- plains about financial difficulties of the Gewerkschaft. TLS. [46 405]. 505. From F. A. Staedtler [Munich, before 28 April 1928] Inquires whether AE’s opening lecture in Davos lecture is available in print. Would like to learn about AE’s opinion on “the statistical nature of physical processes.” TLS. [22 228]. 506. From Max von Laue et al. [Berlin, 29 April 1928] Twenty-three members of the German Chemical Society, among them its President Schlenk, Hahn, Meitner, Paneth, Rubens, and Sommerfeld, send their new honorary member their best greetings and cordial wishes for a speedy recovery (see Abs. 509). AKS. [21 359].