7 9 6 C H R O N O L O G Y 1 9 2 8 July 10 Publishes “Riemannian Geometry Retaining the Concept of Distant Parallelism” (Doc. 216) and “New Possibility of a Unified Field Theory of Gravitation and Electricity” (Doc. 219). September 4 Visited by Aby Warburg, and draws sketch explaining Kepler’s inference of the elliptical orbits of the planets in Warburg’s notebook (see Bredekamp and Wedepohl 2015, p. 10). before September 26 Joins honorary committee of the Freie Hochschule Berlin e.V. (Vossische Zeitung, 26 September 1928, ME). before September 30 Becomes member of committee to support the public kitch- ens established by Jenny Baerwald, which supply free meals to needy families (Berliner Tageblatt, 30 September 1928, ME). October 2 Returns to Berlin from Scharbeutz. October 7–8 Joins the honorary committee for the fiftieth anniversary celebration of the Humboldt University (Neues Wiener Journal, 7 October 1928). before October 9 Joins Komitee für internationale Aussprache in Berlin (Vorwärts, 9 October 1928). October 19 Sends TLC version of “Against Punishment of Homosexuals” (Doc. 287). November 3 Interviewed by the press on his new unified field theory. “Einstein on Verge of Great Discovery Resents Intrusion,” published by the New York Times, 4 November 1928 (Appendix H). before November 25 Spends two weeks alone at Gut Lemm in Gatow. December 9 “Fundamental Concepts of Physics and Their Most Recent Changes” (Doc. 329) is published. after December 19 Cosigns statement on chemical and bacteriological warfare for the Women’s International League for Peace and Freedom (Doc. 342). December 20 Travels to Gatow and again stays at Gut Lemm. before December 24 Returns to Berlin. December 27 Makes third trip to Gatow and Gut Lemm.