I N D E X 9 7 5 protection of, 345 Disendruk, Z., 609 Disk, rotating in magnetic field, paradox on an- gular momentum of, 430, 432–434 Ditmar, Rudolf, 891a, 901a Dix, Otto, 43, 87n Doetsch, Gustav, 43 Don Quixote, one of AE’s favorite books, 35 Dornier Werke, Friedrichshafen, 842a Dostoevsky, Fyodor, 945 AE on, 909 Drechsler, R., 840a Drei Masken-Verlag, 817a Dreyfus, G. L., 43 Dreyfus, Willy, 754 Drill, Robert, 817a Druck- und Verlagshaus Karl Prochaska, Ceský Tešin, 813a Drummond, Eric, 843a, 874a Dub-Chtiz, Gisella Ella (1877–1945), 640 Dubnow, Simon (1860–1941), 690n, 705n Ducrue, Joseph (1851–1937), 633 Dufour-Feronce, Albert, 836a, 841a, 852a, 853a, 854a, 858a Duisberg, C., 865a Dukas, Helen (1896–1982), 293n, 487n, 864a, 906a, 907a, 945 hired as AE’s secretary, xli, lxii Dukas, Hermann (1890–1940), 487n, 890a Dukas, Rahel (1927–2003), 487n Dukas, Rosa, lxii, 487n Dukas-Hirschlaff, Hilde (1895–1968), 487n Dupont, Paul, 888a Düring, Ernst von, 43 Düsseldorf, AE visits, 710, 905a Dyck, Walther von, 882a Dymond, E. G., 428 Dymow, Ossip, birthday greetings, 894a Earth magnetic field of, Schlomka’s airplane experi- ments on direction of, 77, 105, 824a AE’s comments, 813a rotation period of, Arco on possible experiment on, 160 AE’s comments, 163 Eastern Europe, Jewish community of, li, 25n health of, 813a impoverishment of, AE on, 705 Ebel, Arnold, 833a Ebert, Carl, 43 Ebert, Friedrich, 11 Eckhardt, Ernst, 851a energy concept of, AE on, 312 Eddington, Arthur S. (1882–1944), 53, 56n, 598n, 824a, 881a field theory of, 54 Eder, M. David, 816a Ehrenfest, Anna (Galinka) (1910–1979), 579 works in Jena, 553 Ehrenfest, Paul (1880–1933), 5n, xlii, lix, 253, 668, 804a, 842a, 843a, 845a, 848a, 852a, 858a, 863a, 884a AE plans to visit, 49 AE postpones trip to, 49 AE sends reprints of Einstein 1929n, 579 birthday greetings, 624 on behalf of Leyden colloquium, 632 on distance in friendship with AE, 189 does not visit Julius family often, 553 on Lorentz’s fatal illness, 247 on music of Honegger and Hindemith, 189 Nobel Prize suggestions, 128 AE on, 242 praises Semen Frank, 188 requests AE’s recent papers, 128 on world-wide affection for AE, 128 Ehrenfest, Paul Jr. (1915–1939), 253, 579, 668 Ehrenfest, Tatiana (1905–1984), 190n, 243, 253, 579, 668, 749, 863a, 884, 906a takes final university examination, 189, 247 passed, 253 Ehrenfest, Wassily (1918–1933), being treated in sanatorium in Jena, 553n Ehrenfest-Afanassjewa, Tatiana (1876–1964), 128, 383, 579 Elsa on, 748 works in Simferopol, 189 Ehrenfest family, AE thanks for picture, 668 Ehrenhaft, Felix (1879–1952, 640, 806a, 808a, 904a position for Hans Albert in Vienna, 68n Ehrenhaft-Steindler, Olga (1879–1933), 640 Ehrenkomitee für den Einstein-Wald in Berlin, 671n Ehrmann, Rudolf (1879–1963), 321n, 340n, 367, 401n, 671n, 857a treats AE, lviii Eiffel, Gustav (1832–1923), 640n work in later life, Besso on, 640 Eigenbrödler Verlag, 826a, 827a, 828a, 831a