x i v LIST OF TEXTS 29. “On an Optical Experiment Whose Result Is Incompatible with the Undulatory Theory,” ca. 19 January 1922 “Über ein optisches Experiment, dessen Ergebnis mit der Undulationstheorie unvereinbar ist” 30. From Paul Ehrenfest, 19 January 1922 31. To Paul Ehrenfest, between 19 and 22 January 1922 32. From Chaim Weizmann, 21 January 1922 33. From Charlotte Weigert, 22 January 1922 Not selected for translation 34. From Heinrich Zangger, after 23 January 1922 Not selected for translation 35. From Koshin Murofuse, around 26 January 1922 Not selected for translation 36. To Emile Berliner, 26 January 1922 37. To Paul Ehrenfest, 26 January 1922 38. To Paul Hausmeister, 26 January 1922 39. From Paul Ehrenfest, 26 January 1922 40. From Jun Ishiwara, 26 January 1922 41. To Arnold Sommerfeld, 28 January 1922 42. From Gregory Breit, 31 January 1922 Not selected for translation 43. “On the Theory of Light Propagation in Dispersive Media,” 2 February 1922 “Zur Theorie der Lichtfortpflanzung in dispergierenden Medien” Preußische Akademie der Wissenschaften (Berlin). Physikalisch- mathematische Klasse. Sitzungsberichte (1922) 44. From Hermann Anschütz-Kaempfe, 3 February 1922 45. From Paul Ehrenfest, 4 February 1922 46. From Joan Voûte, 11 February 1922 Not selected for translation 47. To Paul Ehrenfest, 12 February 1922 48. To Hans Albert and Eduard Einstein, 12 February 1922 49. From Hans Albert Einstein, between 12 February and 4 March 1922 50. From Eduard Einstein, between 12 February and 4 March 1922 51. To Madeleine Rolland, 15 February 1922 52. From Emil Warburg, 15 February 1922