8 6 0 C A L E N D A R O F A B S T R A C T S 1 9 2 4 by AE, however, can be on any subject, not merely on physics. E.g., the Austrian com- poser Weingartner sent an article on Goethe, and the French researcher Charles Richet wrote a few lines against war. Requests an article of similar length as Richet’s. IE notes: “Beantw. am 12. 1. 24.” (See Doc. 86 for AE’s contribution.) TLS. [44 436]. 246. From the General Secretariat of the Deutsches Rotes Kreuz Berlin, 4 January 1924 Thanks for the draft on the needs of German scientists, requested in Abs. 225. IE notes: “Beantw. am 17. II. 24.” TLS. [44 817]. 247. From Paul Kersten Berlin, 5 January 1924 Reminds AE of his promise in Abs. 6 to write an article for the Berliner Hochschul- Nachrichten on the League of Nations and German science and especially on how the ICIC is beneficial to German science. IE notes: “Beantw. am 12. I. 24.” ALS. [43 923]. 248. From Bernhard Dernburg Berlin, 6 January 1924 Invites AE, Elsa, Margot, and Ilse Einstein to a recital of compositions by his son-in-law on 12 January, at his home. ALS. [43 523]. 249. From Édouard Descamps Brussels, 6 January 1924 Reminds AE that on the occasion of his lectures in Paris, he had extended an invitation to AE to visit Brussels, which he now reiterates. On behalf of the Belgian Royal Acad- emy of Sciences, offers to host AE at the Palais des académies. ALS. [43 525]. 250. From José Arce and Mauricio Nirenstein Buenos Aires, 7 January 1924 In Abs. 238 reference was made to twelve lectures expected to be delivered by AE. This number was calculated based on the number of lectures usually delivered by foreign vis- itors. However, the University of Buenos Aires leaves the decision as to the number of lectures entirely up to AE. Enclosed with Abs. 307. TLS. [43 096]. 251. From Gerhard H. Dieke Leyden, 9 January 1924 The rotation heat of a hydrogen molecule calculated both with integer and half quantum numbers does not correspond to the experimental value. Is ready to continue the calcu- lations. ALS. [43 549]. 252. From Hans Joachim Berlin, 10 January 1924 Requests opinion on his manuscript, which he had sent to Leyden, and draws attention to Stäckel 1890, who formulated the Jacobi-Lagrange equations in Riemannian coordi- nates, and concludes that the solution of an analytical problem makes it possible to solve various dynamical problems by interpreting the deduced functions of time in mechanical terms. The analytical equivalence of these dynamical problems can be called relativity. The importance of general relativity is not only in relativity but in the equivalence of mathematical operations and physical phenomena, for which his manuscript provides an example. ALS. [13 443]. 253. From Paul Wagner Berlin, 10 January 1924 Encloses a manuscript on “Irrtümer der Relativitätslehre” ([45 197]). ALS. [45 196]. 254. From A. Bension Bombay, 11 January 1924 Upon H. J. Shemtob’s request, forwards the attached Abs. 217. Hopes AE will accept Shemtob’s request to act as trustee of his endowment. IE notes: “Telegraphiert briefl. Beantwortet am 9. II. 24.” TLS. [44 893]. 255. From Marcel Grossmann Zurich, 11 January 1924 Invites AE to the annual meeting of the Schweizerische Naturforschende Gesellschaft to be held on 1–4 October in Lucerne. Complains that people cannot learn the value of peace from history, only from their personal experience of war. TLS. [11 469].