9 1 0 C A L E N D A R O F A B S T R A C T S 1 9 2 6 348. To Ernst Cassirer [Berlin,] 6 March 1926 Requests assistance in finding a teaching position in sociology for David Koigen, pos- sibly in Hamburg, who is having a difficult time as an East European Jew. Koigen had a teaching position in Russia. Attaches a list of Koigen’s publications. ALS. [80 736]. 349. To Georges Oprescu [Berlin,] 6 March 1926 He will attend the meeting on 15 July but will be unable to attend the meeting of the di- rectors of the IIIC on 25 March. Hopes that Langevin will represent him. AKS (SzGeB- NU R1036/13C/49461/31637). [82 794]. 350. To Ernst Pohlhausen Berlin, 6 March 1926 In reply to Abs. 339, he does not know the candidate for Rostock. Schottky is a very original and talented scholar. AE does not understand why Schottky is not being awarded a full professorship, since he is not only a theoretician, as his successful work at Siemens indicates. Schottky focuses on the big issues and avoids easy pickings, a rare attitude that should be cherished and protected. ALS. [21 552]. 351. From David Koigen Berlin-Schmargendorf, 7 March 1926 Thanks for AE’s kindness and agrees that the memorandum he brought should be for- warded to Ernst Cassirer in Hamburg. ALS. [44 162]. 352. From Auguste Piccard Brussels, 7 March 1926 The letter of recommendation he had asked for in Abs. 192 made leasing easy. Sketches the final interferometer and provides the schedule of measurements. Requests another letter of recommendation for German authorities in case they would land on German ter- ritory. ALS. [19 215]. 353. From Émile Delcambre Paris, 9 March 1926 Director of Office National Météorologique, encloses proposal for an International Bu- reau of Meteorology. This proposal is significantly reduced. H. A. Lorentz has requested that the meeting with M. Curie, AE, and Delcambre take place on 29 March at 10 A.M. at the IIIC. ALS. [34 818]. 354. From Paul Ehrenfest [Leyden,] 9 March 1926 Thanks for Doc. 194. He has returned one copy of the corrected proofs of Einstein 1926o (Doc. 131) to Chicago University Press. If AE wishes to make any other corrections, he should send the enclosed copy directly to the Press. Sends best regards from Tatiana Ehrenfest-Afanassjewa, who was in Russia at the time. ALS. [10 132]. Written on the last page of the galleys of Einstein 1926o (Doc. 131). 355. From Walter Jungnickel Berlin, 9 March 1926 Since his inquiries have not been answered by the Astrophysikalisches Institut, sends his important and experimentally confirmed discovery for evaluation to AE. He is contest- ing the interpretation of the principle of conservation of energy. Believes that a per- petuum mobile can be devised. ALS. [44 083]. 356. From Ismar Elbogen and Gotthold Weil Berlin, 10 March 1926 A number of gentlemen have come together to assist David Koigen in finding an appro- priate position. They have learned that AE has mentioned the possibility of working for the ICIC and believe that Koigen would be extremely well suited to such a position. Hopes that AE will intervene soon. TLS. [44 164].