C A L E N D A R O F A B S T R A C T S J A N U A R Y 1 9 2 8 8 4 1 407. From Robert Henseling Stuttgart, 24 January 1928 Requests that AE give a lecture on frontier issues in science at the local planetarium. Of- fers honorarium of 600 M. TLS. [48 001]. 408. To Frank Allen Berlin, 25 January 1928 In reply to Abs. 371, agrees that relativity theory bases gravitational phenomena on a modification of space caused by material objects. But this would apply to any field theory. What is essential in general relativity is that inertia and gravity are essentially alike and that the gravitational field is decisive for both the metric behavior of bodies and the metric properties of space. TLC. [25 002]. 409. To Emil Julius Gumbel Berlin, 25 January 1928 In reply to Abs. 406, repeated failures with the Educational Board impel him to proceed carefully. The application may only succeed with K. Pearson’s express approval. En- closes letter of recommendation to Pearson (see Abs. 411). TLC. [46 505]. 410. To Samuel I. Krieger Berlin, 25 January 1928 In reply to Abs. 360, remembers him all too well and declines having anything further to do with him. TLC. [47 315]. 411. To Karl Pearson [Berlin,] 25 January 1928 Recommends E. J. Gumbel highly (see Abs. 409) and mentions his numerous, brave po- litical writings and his respected standing in Germany’s public life. TLC. [46 507]. 412. From Aihiko Sata Osaka, 25 January 1928 Thanks AE for the beautiful reception accorded him during his visit to Germany in June and July 1927. His son N. Sata is studying with E. Freundlich at the KWI asks AE to visit him on occasion. TLS. [48 269]. 413. From Emil Julius Gumbel Heidelberg, 26 January 1928 Thanks for Abs. 409 and Abs. 410. Has of course contacted K. Pearson beforehand, and Pearson has already written to the Education Board, and encloses the board’s two letters. Requests AE’s recommendation to the board. TLS. [46 509]. 414. From [Han Sin] Liau Berlin, 26 January 1928 Following up on AE’s agreeing to answer some questions on the terror in China, he asks: 1. Is an independent and unified China in the interest of peace and of world progress? 2. Do imperialist states have the right to interfere in the process of self-liberation of 400 million Chinese? 3. Is it the duty of European intellectuals to take a position against the murder of university professors, teachers, and students who are fighting for national in- dependence? TLS. [45 745]. 415. From Curt Schwarz [Charlottenburg,] 27 January 1928 His main question is how the stars get their energy to radiate, because neither contrac- tion, nor radioactive decay, cover their energy need. By accepting Walther Nernst’s hypothesis that atoms not only transform into radiation but also arise from radiation, an equilibrium of atoms and radiation exists in the universe as a whole. Following Kant’s route to his world system, supposes the entropy to be additive, and arrives at the result that the temperature of the universe is lower than 10 centigrades. ALS. [48 443]. 416. From Leon Steinig Geneva, 27 January 1928 In response to Abs. 355, hopes that the German organizations will be contacted in Feb- ruary. F. Maurette recommends that AE then invite these unions’ representatives and urge them to unite around a delegate. A. Dufour-Feronce agrees. He would be happy with the choice of W. von Moellendorf. ALS. [46 386]. 417. To Robert Henseling [Berlin,] 29 January 1928 In reply to Abs. 407, regrets being unable to comply. TLC. [48 004].