xxii LIST OF TEXTS 348. From Heinrich Schenk, 31 January 1912 349. To Carl Schröter, 1 February 1912 350. From Richard Swinne, 1 February 1912 351. To Ludwig Forrer, 2 February 1912 352. To Alfred and Clara Stern, 2 February 1912 353. From Alfred Stern, with Postscript by Clara Stern, 3 February 1912 354. To Michele Besso, 4 February 1912 355. From Robert Gnehm, 7 February 1912 356. To Conrad and Paul Habicht, 9 February 1912 357. To Paul Ehrenfest, 12 February 1912 358. To Robert Gnehm, 12 February 1912 359. From Hendrik A. Lorentz, 13 February 1912 360. To Hendrik A. Lorentz, 18 February 1912 361. From Robert Heller, 19 February 1912 362. From Emil Warburg, 19 February 1912 363. From Ludwig Hopf, 20 February 1912 364. To Ludwig Hopf, after 20 February 1912 365. To Wilhelm Wien, 24 February 1912 366. To Heinrich Zangger, before 29 February 1912 367. To Paul Ehrenfest, 29 February 1912 368. From Fritz Haber, 8 March 1912 369. To Paul Ehrenfest, 10 March 1912 370. To Marian von Smoluchowski, 10 March 1912 371. To Wilhelm Wien, 11 March 1912 372. From Walter König, 11 March 1912 373. To Walter König, after 11 March 1912 374. To Alfred and Clara Stern, 17 March 1912 375. To Wilhelm Wien, 20 March 1912 376. To Marian von Smoluchowski, 24 March 1912 377. To Michele Besso, 26 March 1912 378. From David Hilbert, 30 March 1912 379. From Heinrich Zangger, 30 March 1912 380. From Paul Ehrenfest, before 3 April 1912