1919-23, Washington U., St. Louis.
1923-25, Princeton U.: 1925, Ph.D. with K. T. Compton.
1925-27, Calif. Inst. Techn., Nat. Res. Fel.
1927-28, Guggenheim Fel.: U. Munich, U. Berlin, U. Leipzig.
1928-46, U. Chicago: 1928-31, Asst. Prof.; 1931-46, Assoc. Prof.

One session, 16 pp. transcript.

GOUDSMIT: 27 Dec 29 (63,7)
KEMBLE: [1925] (51,6).
SOMMERFELD: 18 Jun 28, 29 Jun 28, 23 Nov 29, 26 Jan 30, (30,7).

See: GOUDSMIT.

1898-1902, U. Manchester.
1902-09, U. Cambridge: 1909, M.A.
1909-13, Royal Observatory, Greenwich, Chief Assistant.
1913-44, Cambridge U., Prof.: 1914-44, Dir., Observatory.

KRAMERS: 12 Dec 23 (8,3).
SCHRÖDINGER: 7 letters 1937-40 (37,5).

See: KRAMERS.

Lecture course, "The Mathematical Theory of Relativity." Notes taken by L. H. Thomas, 39 sheets, Cambridge, 1922-23 (5,1).

BIBLIOTHÈQUE DE L'UNIVERSITÉ LIBRE DE BRUXELLES, Brussels, Belgium. 5 Letters to Th. de Donder 1921- 36.
BOHR COLLECTION, Copenhagen, Denmark. Letter to Bohr, 21 Feb 24. See Bohr.
TRINITY COLLEGE LIBRARY, Cambridge, England. journal 1905-14; paper on astronomy dating from school years; manuscript, "The Nature of the Physical World."
DEUTSCHE STAATSBIBLIOTHEK, Berlin. Material at present held at the Westdeutschen Bibliothek, Marburg/Lahn, Germany [BRD]. Letter to Fritz Cohn, 1922; to Kayser, 12 Apr 13, 3 Jul 13, 30 Jul 13; to W. Westphal, 1921. (Darmstaedter Collection).
BIBLIOTHEK DER EIDGENÖSSISCHEN TECHNISCHEN HOCHSCHULE, Zurich, Switzerland. Letters to Weyl, 16 Dec 18, 18 Aug 20, 27 May 21, 10 Jul 21, 31 Oct 29, 24 Nov 29, 23 Feb 30, 2 Apr 30, 2 May 30, 21 May 30, 1 letter [undated], 2 letters 1944. See: Weyl.
PAULI COLLECTION, Zurich, Switzerland. See: Pauli.
BURNDY LIBRARY, Norwalk, Conn. Manuscript in Weiner Collection.
EINSTEIN COLLECTION, Princeton, N.J. Correspondence with Einstein, 13 items 1919-29.

1900-04, U. Göttingen and U. Vienna:
1904, U. Vienna, Dr. phil. with L. Boltzmann.
1907-12, Polytechnic Inst., St. Petersburg, Lect.
1912-33, U. Leiden, Prof.
Misc..: 1924, Calif. Inst. Techn., Lect. 1930, U. Michigan.
1930-31, Calif. Inst. Techn.

BOHR: 10 May 18, 13 Jan 19, 6 Feb 19, 28 Feb 19, 14 May 19, 4 Jun 19, 3 Nov 19, 2 letters 30 Jan 20,.14 May 20, 19 Aug 20, 17 Oct 20, 27 Dec 20, 2 letters 25 Mar 21, 26 Apr 21, 3 Jul 21, 17 Jul 21, 7 Aug 21, 27 Sep 21, 26 Oct 21, 8 Jan 22, 25 Jan 22, 8 May 22, [Nov-Dec 1922], (BSC 2,1).
J. M. BURGERS: 17 [Dec] 14, 11 Jan 16, 10 Dec 16, 15 Aug 17, 27 Aug 17, 29 Aug 17, 9 Aug 18, 2 Oct 18, 24 Oct 18, 13 Dec 18, 2 Jan 19, 19 Jan 19, 4 Jun 19, 10 Jun 19, 11 Dec 19, 26 Dec 19, 11 Jan 20, 14 Dec 20, 6 Feb 21, 16 Mar 21, 9 Dec 21, 12 Feb 22, 18 Nov 22, 7 Feb 23, 13 Feb 23, (75,1); 17 Mar 23 (66,3); 28 Mar 23, 30 Sep 23, 3 Oct 23, 14 Nov 23, 25 Mar 24, 6 Jul 24, 4 Dec 24, 20 Jan 25, 10 Nov 25, 20 Feb 26, 28 Feb 26, 2 Apr 26, 13 Apr 26, 18 Apr 26, 11 Jul 26, 20 Jan 27, 7 Feb 27, 12 Feb 27, 3 Oct 27, 14 Dec 27, 6 May 28, 13 May 28, 24 Jul 28, 4 Aug 28, 23 Aug 28, 13 May 29, 5 Jun 29, 21 Oct 29, 12 Nov 29, 22 Oct 31, [?] 1932, 14 Jan 32, 5 Jul 32, 8 Aug 32, 17 Aug 32, 1 letter (undated), (75,1).
DENNISON: 30 May 27 (59,1).
DIEKE: 3 Nov 27 (61,7); 25 Dec 27 (75,2); 17 Mar 30, 28 Mar 30, 24 Apr 30 (64,3); 5 May 30 (64,4); 16 May 30, 21 May 30 (75,2).
DIRAC: 1 Oct 26 (59,2).
EPSTEIN: 17 Mar 30 (64,3).

FERMI: 28 Mar 30 (75,2); 20 Sep 31 (65,5).
GOUDSMIT: 31 Jul 21 (60,1); 14 Apr 24 (60,2); 6 Jul 24 (60,3); 17 Feb [25] (60,4); [fall 1925], 28 Dec 25, (60,5); 28 Feb 26, 7 Mar 26, (60,6); 3 Sep 26 (60,8); [fall] 1926, 28 Nov 26, 28 Dec 26, (60,9); 2 letters 6 Jan 27 (61,1); 19 Feb 27, 11 Mar 27, (61,2); 25 May 27, 31 May 27, (61,3); 11 Jun 27, [mid Jun 27], 17 Jun 27, (61,4); 21 Jul 27 (61,5); 7 Aug 27 (61,6); 29 Aug 27 (75,2); 3 Nov 27 (61,7); 25 Dec 27 (75,2); 11 Apr 28, 30 Apr 28, (62,1); 9 May 28, 14 May 28, 21 Jun 28, (62,2); 4 Apr 29 (63,3); 14 May 29 (63,4); 20 Oct 29, 31 Oct 29, (63,7); 9 Feb 30, 21 Feb 30, 14 Feb 30, (64,2); 14 Mar 30, 17 Mar 30, 18 Apr 30, 24 Apr 30, 27 Apr 30, (64,3); 5 May 30 (64, 4); 16 May 30, 21 May 30, 22 Sep 30, (75,2); 14 Oct 30, 26 Nov 30, (64,6); 18 Jul 31, 22 Jul 31, (65,4); 15 Aug 32, 23 Sep 32, (65,8).
KRAMERS: 25 Dec 15, [Oct 1916], 9 Sep 20, 19 Sep 20, 19 Jan 21, 23 Jan 21, 7 Apr 21, 3 May 21, 24 Oct 21, 2 Nov 21, 12 Nov 21, 2 Feb 22, (8,5); 8 May 22 (BSC 2,1); 20 Dec 22, 4 Nov 23, 13 Nov 23, 23 Nov 23, 2 Tan 24, 1 Nov 24, 10 Jan 25, 2 Nov 25, (8,5); 30 Jan 26, 18 Feb 27, 27 Sep 27, 5 Nov 27, 6 Nov 27, 7 Nov 27, 11 Nov 27, 17 Nov 27, 1 Jan 28, 13 Jan 31, (9,10).
LANDÉ: 21 Dec 22, 18 Feb 23, 8 Nov 24, 7 Dec 24, 19 Jan 25, 13 Mar 26, (4,3).
RANDALL: 7 Dec 26 (60,9).
SOMMERFELD: 17 Sep 11, 3 Oct 11, 23 Jun 12, (30,7).
UHLENBECK: 18 Jul 25, 11 Aug 25, 15 Aug 25, 25 Sep 25, 29 Dec 26, (75,2); 11 Jun 27 (61,4); 21 Jul 27, 23 Jul 27, 29 Aug 27, (75,2); 3 Nov 27 (61,7); 25 Dec 27 (75,2); 11 Apr 28 (62,1); 14 Feb 30 (64,2); 14 Mar 30, 17 Mar 30, 24 Apr 30, (64,3); 5 May 30 (64,4); 16 May 30, 21 May 30, 1 Jun 30, 22 Sep 30, 7 Oct 30, (75,2); 26 Nov 30 (64,6); 28 Apr 31, 23 Jun 32, (75,2).
ZEEMAN: 21 Jun 28 (62,2).

See: BOHR, J. M. BURGERS, EINSTEIN, GOUDSMIT, LANDÉ, UHLENBECK.

Lecture course on mechanics. Notes taken by D. Struik. Leiden, 1914-15. (75,3).
Notes for a popular lecture, 12 pp., [1926 or 1927] (75,2).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 13 Feb 23, 3 Jun 25, 19 Sep 25, 27 Sep 25, 11 Oct 25, 6 Jan 26, 8 Jan 26, 12 Jan 26, 14 Dec 26, 24 Jul 27, 12 Oct 27, 11 Jan 28, 6 Mar 28, 15 Mar 28, 2 Jun 28, 8 Jul 28, 26 Dec 28, 16 Jan 29, 24 Feb 29, 20 Oct 29, 22 Oct 29, 3 Nov 29, 5 Dec 29, 20 Dec 29, 24 Jan 30, 1 Sep 30, 17 Mar 31, 13 May 31, 31 May 31, 18 Jun 31, 9 Jul [31], 4 Oct 31, 12 Sep 31, 19 Sep 31, 15 Nov 31; to Einstein, 11 Jan 28, 8 Jul 28, 12 Sep 31, 19 Sep 31. See: Bohr, Einstein.
DEUTSCHE STAATSBIBLIOTHEK, Berlin. Material at present held at the Westdeutschen Bibliothek, Marburg/Lahn, Germany [BRD]. Letter to Erich Jahnke, 1917; to Wilhelm Westphal, 1921. (Darmstaedter Collection Fla 1912).
BAYERISCHE STAATSBIBLIOTHEK, Munich, Germany [BRD]. Letter to P. von Groth, 1916 (Grothiana X)
ALGEMEEN RIJKSARCHIEF, The Hague, The Netherlands. Letters to Lorentz among his papers, 1888-1928. Brief inventory published in Inventarissen van Rijks- en andere archieven 2 (The Hague, 1930).
RIJKSMUSEUM VOOR DE GESCHIEDENIS DER NATUURWETENSCHAPPEN, Leiden, The Netherlands. Letter to Kramers, 1929; several to Joffé, 192728. Ehrenfest's answers to letters from Bohr, Born, Goudsmit, Lorentz, Ornstein, Planck, Schrödinger, 1915-33. Extensive collection of Letters to members of his family, mostly personal. 7 exercise-books of the "Monday Morning Lecture" of Lorentz, 191318; 10 exercise-books, lecture notes; 26 notebooks with notes on diverse physical problems; 3 notebooks with travel notes on congresses, etc. See: Berliner, Bohr, Born, Goudsmit, Kramers, Lorentz, Ornstein, Planck, Schrödinger, Stark.
PAULI COLLECTION, Zurich, Switzerland. Letters to Pauli, 24 Jan 27, 22 Sep 28, 26 Sep 28. See: Pauli.
BIBLIOTHEK DER EIDGENÖSSISCHEN TECHNISCHEN HOCHSCHULE, Zurich, Switzerland. Letter to Weyl, 8 Dec 27.
BURNDY LIBRARY, Norwalk, Conn. Manuscripts in Weiner Collection.
LIBRARY OF CONGRESS, Washington, D. C. Correspondence with Veblen, 1929-30.
EINSTEIN COLLECTION, Princeton, N.J. Correspondence with Einstein, 170 items 1913-33.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 30 Sep 28, 20 May 33, 26 May 33, 10 Aug 33.

1897-1901, Eidgn. Techn. Hochsch. Zurich.
1901-09, Patent Office, Bern, junior Officer.
1905, U. Zurich, Dr. phil. with A. Kleiner.
1909-11, U. Zurich, a. o. Prof.
1911-12, U. Prague, o. Prof.
1912-13, Eidgn. Techn. Hochsch, Zurich, o. Prof.
1914-33, U. Berlin, o. Prof. and Dir., Kaiser Wilhelm Inst. Phys.
1920-55, U. Leiden, Hon. Prof.
1933-45, Inst. Adv. Study, Princeton.
Misc..: 1921, Lect.: U. Prague, U. Vienna, Columbia U., U. Princeton, U. London.
1921, 1930-31, 1932-33, Calif. Inst. Techn., Visiting Prof.
1922, Collège de France, Lect.
1931, U. Oxford, Lect.
1931-32, U. Cambridge, Lect.

BOHR: 2 May 20 (BSC 2,2).
EHRENFEST: 23 Aug 15, 29 Dec 15, 3 Jan 16, 5 Jan [16], 17 Jan [16], 29 Apr 16, 24 May 16, 25 Aug 16, 6 Sep 16, 14 Sep 16, 18 Oct 16, 24 Oct 16, 7 Nov 16, 17 Nov 16, 5 Dec 16, 4 Feb 17, 14 Feb 17, 25 May 17. 3 Jun 17, 22 [Jul] 17, 12 Nov 17, 1 May 18, 5 Jun 18, 4 Sep 18, 27 Sep [18], 6 Dec 18, 22 Mar 19, 9 Sep 19; 12 Sep 19, 28 Sep 19, 2 letters [12 Oct 19], 15 Oct 19, 4 Dec 19, 10 Dec 19, 23 Jan 20, 2 Feb 20, [10 Mar 20], 20 Apr 20, 4 May 20, 25 May 20, 6 Jun 20, 19 Jul 20, 30 Jul-20, 13 Aug 20, [10 Sep 20], 26 Nov 20, [20 Jan 21], [22 Jan] 21, 12 Feb 21, 1 Mar 21, 8 Mar 21, 15 Mar [21], 18 Jun 21, [10 Sep 21], 1 Oct 21, [3 Jan] 22, 11 Jan 22, [22 Jan 22], 30 Jan [22], 12 Feb 22, [c. 20 Mar 22], 23 Mar 22, 21 Apr 22, 24 Apr 22, 18 May 22, 23 May 22, 30 May 22, 8 Aug 33, 7 Oct [??], 26 Dec [??], 12 Jan [??], 7 Apr [??], 2 letters [undated], (1).
HABER: [1920-21] (66,3).
JORDAN: 6 Mar 26 (18 1).
LANDÉ: 6 Nov 24 (4,15).
SCHRÖDINGER: 8 letters 1936-53 (37,5).
SOMMERFELD: 14 Dec 46 (30,8).
W. WILSON: [4 Jul 49] (66,3).

See: BOHR, KEMBLE, SOMMERFELD.

Typescript draft, "Elementare tyberlegungen zur Interpretation der Quantenmechanik," 10 pp., [undated] (43,9).

BIBLIOTHÈQUE DE L'UNIVERSITÉ LIBRE DE BRUXELLES, Brussels, Belgium. 2 Letters to Th. de Donder, 1916-20.
BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 10 Jan 23, 4 Jul 31, 16 Sep 32, 4 letters 1949-55; to Ehrenfest, 25 Sep 25, 17 Sep 31; to Pauli, 2 May 48. See: Bohr, Ehrenfest, Pauli.
EDINBURGH UNIVERSITY LIBRARY, Old College, Edinburgh, Scotland. 5 Letters to R. Schlapp, 195253.
BEDFORD COLLEGE LIBRARY, University of London, London, England. Letter to W. Wilson, 1949.
DEUTSCHE: STAATSBIBLIOTHEK, Berlin, Germany. [DDR]. 2 Letters to A. von Harnack, 1923-30. (Nachlass Harnack).
DEUTSCHE STAATSBIBLIOTHEK, Berlin. Material at present held at the Westdeutschen Bibliothek, Marburg/Lahn, Germany [BRD]. Letter to "Berlin am Morgen," 1932; to Daermstaedter, 1911, including "Bermerkung über eine fundamentale Schwierigkeit in der theoretischen Physik"; to Domela, 1932; to Fischer, 1910; 2 to "Berliner Goethebund," 1915; 1 letter [undated] including MS., "Meine Meinung über den Krieg"; to Scheel 8 Jul 14; to von Waldeyer-Hartz, 1915. (Darmstaedter Coll., Fla 1908)
WESTDEUTSCHEN BIBLIOTHEK, Marburg/Lahn, Germany [BRD]. 2 Letters to Gockel, 1908-09.
DEUTSCHES MUSEUM, Munich, Germany [BRD]. Letter to von Laue, 10 Jun 12; to Runge, 8 Nov 20.
ALGEMEEN RIJKSARCHIEF, The Hague, The Netherlands. Letters to Lorentz.
RIJKSMUSEUM VOOR DE GESCHIEDENIS DER NATUURWETENSCHAPPEN, Leiden, The Netherlands. Letter to Kamerlingh-Onnes, 1924. Manuscript, "H. A. Lorentz als Schöpfer und als Persönlichkeit." See: Kamerlingh-Onnes, Langevin.
BIBLIOTHEK DER EIDGENÖSSISCHEN TECHNISCHEN HOCHSCHULE, Zurich, Switzerland. Letters to Weyl, 23 Nov 16, 3 Jan 17, 6 Apr 17, 8 Mar 18, 8 Apr 18, 15 Apr 18, 19 Apr 18, 19 Apr 18, 1 May 18, 10 May 18, 31 Jun 18, 3 Jul 18, 27 Sep 18, 29 Nov [18], 16 Dec 18, 5 Sep 21, 16 Dec 21, 22 Dec 21, 6 Jun 22, 23 May 23, 26 May 23, 26 Apr 27, 14 Mar 29, 25 Apr 31, 1 letter [undated].
PAULI COLLECTION, Zurich, Switzerland. Letters to Pauli, 24 Dec 29, 22 Jan 32, 2 May. 48. See: Pauli.
BURNDY LIBRARY, Norwalk, Conn. Manuscript in Weiner Collection.
LIBRARY OF CONGRESS, Washington, D.C. Correspondence with Veblen, 1922-29.
DEPARTMENT OF PHYSICS, INDIANA STATE COLLEGE, Terre Haute, Ind. Short letter in possession of H. K. Hughes.
EINSTEIN COLLECTION, Princeton, N.J. For correspondence with Einstein, see: Becquerel, Berliner, Bohr, Born, Bothe, Bragg, Breit, Brillouin, L. de Broglie, Debye, Eddington, Ehrenfest, Epstein, Fokker, Franck, Gamow, Geiger, Haas, Haber, Halpern, Heisenberg, Hilbert, Jaffé, Jeans, Jordan, Kamerlingh-Onnes, Kaufmann, Kellner, Klein, Ladenburg, Lanczos, Landé, Lenard, Lenz, Lewis, Lorentz, Meissner, Meitner, Meyer, Mie, Millikan, Nernst, Nordström, Pauli, Perrin, Planck, P. Pringsheim, Raman, Reiche, Russell, Rutherford, Scherrer, Schottky, Schrödinger, Senftleben, Silberstein, Sommerfeld, Stark, Stern, Thirring, G. P. Thomson, Tolman, Warburg, Wien, Zeeman.
AMERICAN INSTITUTE OF PHYSICS, New York, N.Y. Letter from August Trowbridge, 9 Feb 31. See: Ladenburg.

1922-23, U. Heidelberg.
1923-24, U. Munich.
1924-27, U. Göttingen: 1927, Dr. phil. with M. Born.
1927-28, U. Zurich, then U. Leiden, Asst. to P. Ehrenfest.
1928-30, Techn. Hochsch. Berlin: Asst.
1930-33, U. Frankfurt-am-Main, Priv.-Doz. 1933-36, Inst. Henri Poincaré, Paris: Res. Fel. with F. Perrin.
1936-41, Calif. Inst. Techn., Asst.
Misc..: 1935, U. Paris, Guest Lect.
1936, U. Paris, Guest Lect. 1938, Mass. Inst. Techn., Lect.

One session, 8 pp. transcript.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 11 Mar [33], 4 letters 1959-62.
See: Bohr.
PAULI COLLECTION, Zurich, Switzerland. 3 Letters to Pauli 1958. See: Pauli.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 3 Feb 28, 3 Oct 35.

1901-06, U. Moscow.
1906-10, Agricultural Inst., Moscow: 1906-09, Asst.; 1909-10, Priv.-Doz.
1911-14, U. Munich: 1914, Dr. phil. with A. Sommerfeld.
1914-17, Interned as enemy alien, Munich.
1919-21, U. Zurich, Priv.-Doz.
1921-53, Calif. Inst. Techn., Prof.
Misc..: 1927 and 1929 T. H. Aachen, Exchange Prof.

Four sessions, 33 pp. transcript.

BOHR: 14 May 18, 2 Oct 18, 6 Oct 18, 24 Oct 18, 2 Mar 21, 10 Sep 21, 23 Dec 22, (BSC 2,2).
KRAMERS: 16 Feb 48 (12,1).
LANDÉ: 8 Dec 21, 1 Sep 22, 31 Dec 22, 2 Apr 23, (4,15).
RUBINOWICZ: 16 May 18, 13 Sep 18, 7 Oct 18, (17,B).
SOMMERFELD: 26 Oct 37, (30,9).

See: BOHR, EHRENFEST.

Notes on a paper on diffraction by Landé, 26 May 15 (4,13).

BOHR COLLECTION, Copenhagen, Denmark. 2 Letters to Bohr, 1947.
RUTHERFORD COLLECTION, Cavendish, Laboratory, Cambridge, England. Letter to Rutherford, 17 Dec 20.
BIBLIOTHEK DER EIDGENÖSSISCHEN TECHNISCHEN HOCHSCHULE, Zurich, Switzerland. Letter to Weyl, 3 Dec 21.
EINSTEIN COLLECTION, Princeton, N.J. Correspondence with Einstein, 10 items 1919-33, 5 items 1945.

1918-21, U. Hamburg: 1921, Dr. phil. with M. Volmer.
1921-22, U. Rostock, Asst. to O. Stern. 1922-33, U. Hamburg, Priv.-Doz.
1933-45, Carnegie Inst. Techn., Assoc. Prof.
Misc..: 1931-32, U. California, Berkeley, Visiting Res. Assoc.

One session, 24 pp. transcript.

1902-06, U. Kiel, U. Jena, U. Berlin: 1906, U. Berlin, Dr. phil. with W. Nernst.
1911-15, U. Berlin, Priv.-Doz.
1915-30, Techn. Hochsch. Breslau, o. Prof. and Dir., Phys. Chem. Inst.
1930-50, U. Göttingen, o. Prof. and Dir., Phys., Chem. Inst.

GERLACH: 23 Jun 22, 4 Nov 23, (19,2).
HEISENBERG: 14 Jul 34 (45,1).
KRAMERS: 3 letters 1937-38 (9,9).
SOMMERFELD: 26 Jan 28, 3 letters 1938-43, (30,9).

See: SOMMERFELD.

DEUTSCHE STAATSBIBLIOTHEK, Berlin. Material at present held at the Westdeutschen Bibliothek, Marburg/Lahn, Germany [BRD]. Letter to Scheel, 31 Jul 16. (Darmstaedter Coll., Fla 1910).
LIBRARY OF THE SWEDISH ACADEMY, Stockholm, Sweden. Letter to Oseen, 29 Sep 26.
UNIVERSITETSBIBLIOTEKET, Uppsala, Sweden. Letter to "Onkel Wolf," 1921. (Waller Coll.)

1902, U. Coll. Aberystwyth, Wales, A. B.
1902-08, U. London: 1906, Master's degree; 1906-08, Demonstrator.
1908-20, U. Manchester: 1908-15, Asst. Lect. and Demonstrator; 1915-20, Senior Lect.; 1919-20, Asst. Dir., Manchester labs.
1920-44, U. Coll. Swansea, Prof.

BOHR: 29 Sep 13, 9 Jul [14], 17 Jul 16, 18 Nov 16, 19 Nov 16, 3 Nov 22, (BSC 2,2).

See: BOHR.

1905-07: 1905, U. Cambridge; 1906-07, U. Göttingen.
1907-12, U. Munich: 1912, Dr. phil. with A. Sommerfeld.
1912-13, U. Göttingen, Asst. to D. Hilbert. 1913-21, U. Munich:
1914-21, Asst. to Sommerfeld; 1917-21, Priv.-Doz.
1921-37, Techn. Hochsch. Stuttgart: 1921-22, a. o. Prof.; 1922-37, Prof.
1937-39, U. Cambridge, Fel.

Two sessions, 34 pp. transcript.

GOUDSMIT: 30 May 29 (63,4).
LANDÉ: 22 Feb 21 (4,15).
SCHRÖDINGER: 1 Sep 27 (41,7).
SOMMERFELD: 6 Apr 35 (30,9).

See: SOMMERFELD.

LIBRARY OF THE SWEDISH ACADEMY, Stockholm, Sweden. Letters to Oseen, 2 Feb 29, 14 Mar 30, 7 Apr 30, 30 Jul 30, 22 Nov 30.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 25 Dec 27, 12 Dec 28, 15 Oct 29, 22 Apr 33, 30 May 33, 10 Jul 33, 16 Jul 33, 12 Oct 34, 7 letters 1935-40. See: London.

1904-07, U. Leipzig.
1907-09, U. Heidelberg: 1909, Dr. phil. with G. Bredig.
1909-10, U. Zurich, Res. Fel.
1910-11, U. Manchester, Res. Fel.
1911-17, Techn. Hochsch. Karlsruhe: 1911-13, Asst.; 1913-17, Priv.-Doz.
1917-35, U. Munich: 1917-25, a. o. Prof.; 1925-35, o. Prof.; 1932-35, Dir., Inst. Phys. Chem.
1936-57, U. Michigan, Prof.
Misc..: 1930, Cornell U., Lect. 1939, U. Buffalo, Lect.

BOHR: 25 Jun 21 (BSC 2,3).
GERLACH: 15 Jul 21, 21 May 23, (19,3).
LANDÉ: 17 Jul 20, 11 Aug 20, (4,16).
SOMMERFELD: 2 letters 1937 (30,10).

BOHR COLLECTION, Copenhagen, Denmark. Letter to Bohr, 20 Mar 24.
RUTHERFORD COLLECTION, Cavendish Laboratory, Cambridge, England. Letters to Rutherford, [14 Oct] 11 to 6 May 20.
LIBRARY OF THE SWEDISH ACADEMY, Stockholm, Sweden. Letter to Oseen, 9 Feb 31.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 12 May 28, 31 Oct 30. See: London.

1919-27, U. Uppsala: 1919, Licentiate; 1921, Fil. D. with C. W. Oseen.
1927-30, Tekn. Högsk. Stockholm, Assoc. Prof.
1930-35, U. Göteborg, Prof.
1935-58, Tekn. Högsk. Stockholm, Prof.

KRAMERS: 19 May 24, 23 May 24, 20 Jun 24, 29 Jul 24, (8,6).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 12 Feb 26, [Mar 26], 11 May 26, 20 Apr 27, 9 Mar 30. See: Bohr, Kramers.
LIBRARY OF THE SWEDISH ACADEMY, Stockholm, Sweden. Letters to Oseen, 27 May 20, 18 Jun 20, 27 Jun 20, 17 Jul 20, 23 Aug 20, 1 Sep 20, 3 Sep 20, 12 Sep 20, 14 Apr 28, 8 Jul 28, 15 Jul 29, 30 Nov 30, 25 Sep 31, 3 May 35, 23 Jun 35, 7 letters 1936-41, 2 letters [undated].

1929, U. Texas, A.B. and A.M.
1930-31, Raytheon Inc., Physicist.
1931-33, Harvard U., Parker Travel. Fel., U. Munich, U. Zurich, U. Rome, U. Leipzig, U. Berlin.
1933-35, Harvard U.: 1933, Ph.D.; 1933-35, Instr.
1935-36, U. Wisconsin, Lect.
1936-38, Inst. Adv. Study, Princeton, Temporary Member.
1938-42, New York U., Prof.

KEMBLE: 15 Aug 31, 29 Aug 31, 1 Sep 31, 12 Nov 31, 5 Feb 32, 7 Feb 32, 8 Mar 32, 3 Jun 32, 24 Jun 32, [Nov] 32, 2 Feb 33, 20 Feb 33, 4 Apr 33, 3 Apr 35, [Dec 35], 6 letters 1936-37, (53,8).

See: KEMBLE

1918-22, U. Pisa: 1922, Dr. phys. with L. Puccianti.
1922-23, Private tutoring, Rome.
1923-24, Traveling scholarship from Italian Govt.: winter 1923-24, U. Göttingen with M. Born; fall 1924, U. Leiden with P. Ehrenfest.
1925-26, U. Florence, Lect.
1926-38, U. Rome, Prof.
Misc..: 1928, U. Leipzig, Lect.
1930, summer, U. Michigan, Lect. Summers 1933, 1935, 1936, 1937, Lect., Stanford U., Columbia U., and Michigan U.

DIRAC: 25 Oct 26 (59p2).
GOUDSMIT: 25 Feb 26 (60,6); 17 Mar 30 (64,3); 3 Mar 31 (65,2); 29 Jul 31, 8 Aug 31, (65,4); 9 Sep 31 (65,5); 7 Jan 32 (65,6).
HEISENBERG: 30 Jan 34, 6 Feb 34, (45,1).
KRONIG: 2 Jan 25, 10 Feb 25, 6 Apr 25, 7 Jul 25, 27 Jul 25, 3 Oct 25, 23 Nov 25, 23 Jul 26, 6 Apr 27, (16,4).

See: EHRENFEST, GOUDSMIT.

Twenty-two research notebooks, "quaderni," c. 3000 pp., [1926]-37 (69-71).
Ten notebooks, "registri," of experimental data on artificial radioactivity, c. 1200 pp., 1934-38 (72).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 26 Feb 31, 3 Mar 32, 7 Feb 34, 15 Oct 34. See: Bohr.
RUTHERFORD COLLECTION, Cavendish Laboratory, Cambridge, England. Letter to Rutherford, 15 Jun 34.
DOMUS GALILAEANA, Pisa, Italy. All the MSS. and documents relating to Fermi's activity in Italy which Prof. E. Amaldi collected when Fermi emigrated to the United States in 1938.
FERMI COLLECTION, University of Chicago Library, Chicago, Ill. Twenty-four boxes of material, almost all of which pertains to Fermi's career in the United States. An inventory has been prepared by the University of Chicago Library (58,2).
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letter to London, 26 Aug 31. See: London.

1904-05, Techn. Högesch. Delft.
1906-13, U. Leiden: 1913, wis.- en natuurkunde with H. A. Lorentz.
1913-14, U. Zurich; U. Manchester; U. Leeds, with W. H. Bragg; U. Leiden, Priv.-Doz.
1914-18, Milit. Serv.
1918-21, Convalescence in Switzerland.
1921-23, Gymnasium teacher, Delft.
1923-27. Tecnn. Högesch. Delft, o. Prof.
1927-55, Teyler's Foundation, Haarlem: 1927-28, Conservator; 1928-55, Curator.
1928 to date, U. Leiden, Special Prof.

One session, 22 pp. transcript.

BOHR: 1 Jan 16, 3 Feb 16, 2 Jan 17, 23 Apr 19, (BSC 2,3).
GOUDSMIT: 3 Jun 23 (60,1); 13 Feb 24 (60,2); 21 Jun 25 (60,4); 6 Sep 26 (60,8); 30 Dec 26 (60,9); 3 Jul 27 (61,5); 14 Aug 27, 20 Aug 27, (61,6); 16 Aug 29 (63,6).
KRAMERS: 18 Sep 20, 28 Sep 20, 23 Nov 20, 4 May 21, 9 Nov 21, 23 Jun 22, 25 Aug 22, 14 Nov
22, 6,Dec 22, 1 Jun 23, 1 Jan 24, 26 May 25, 27 Sep 25, (8,7); 15 Dec 26, 8 Jun [??], 23 Feb 30, 4 letters 1936-39, (9,12); 13 letters 1942-51 (12,3).
LANDÉ: 22 Oct 21, 25 Oct 21, (4,16).
SCHRÖDlNGER: 3 letters 1952-55 (37,6).
SOMMMFELD: 3 letters 1941 (30,11).

See: BOHR, SOMMERFELD.

Lecture course on radioactivity, notes taken by Kramers, 19 sheets, Leiden, 1915-16 (25,3).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 14 Apr 25, 9 Oct 25, 22 Jun 30, 9 Jul 31, [Aug 34], 4 letters 1947-55. See: Bohr.
PAULI COLLECTION, Zurich, Switzerland. See: Pauli.
EINSTEIN COLLECTION, Princeton, NJ. Correspondence with Einstein, 4 items 1919-20, 2 items 1955.

1909, Western Reserve U., A.B.
1909-11, U. Nebraska, Asst.
1911-16, U.S. Bureau of Standards: 1911-13, Lab. Asst.; 1913-16, Asst. Physicist.
1916-17, U. Minnesota: 1916-17, Instr.; 1917, Ph.D.
1917-27, U.S. Bureau of Standards: 1917-19, Assoc. Phys.; 1919-27, Physicist.
1927-53, Gulf Oil Companies, Dir. Research.
Misc..: 1927, U. Pittsburgh, Lect.
1927-29, Mellon Institute, Senior Instr.

BOHR: 21 Oct 18, 1 Jul 21, 8 Aug 21, (BSC 2,3).
SOMMERIFELD: 23 Mar 35 (30,11).
VAN VLECK: 24 Mar 24, 20 Nov [25], 10 Dec [25], (49,6).

See: BOHR, VAN VLECK.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 5 Mar 24, [Apr 26]. See: Bohr.
AMERICAN INSTITUTE OF PHYSICS, New York, N.Y. Autobiographical memoir.

1906-14, École Norm. Sup., Paris and Eidgn. Techn. Hochsch. Zurich.
1914, U. Paris, Dr. ès. sci. with P. Weiss.
1919-c. 57, U. Grenoble: 1919-30, Maître de Conférences; 1930-c. 57, Prof.

GOUDSMIT: 7 Apr 25 (60,4); 31 Aug 28 (62,3) 10 Apr 30 (64,3).

1911, Acadia U., B.S.
1911-15, Schoolteacher.
1917-19, Milit. Serv.
1919-24, Yale U.: 1919-20, Loomis Fel.; 1920-21, Instr.; 1921, Ph.D.; 1921-24, Nat. Res. Fel.
1924-55, McGill U.: 1924-30, Asst. Prof.; 1930-31, Assoc. Prof.; 1931-55, Prof.
Misc.: 1926-27, U. Copenhagen, Intl. Educ. Board Fel.
1930, Yale U., Fel.
1931, Ohio State U., Visiting Prof.

GOUDSMIT: 2 May 28, 12 Jun 28, (62,2).
KRAMERS: 13 Aug 24 (12,2).
TAKAMINE: 31 Jul 23 (34,6).

See: GOUDSMIT.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 27 Nov 23, 10 May 24, 4 Mar 26, 5 Mar 26, 27 Mar 26, 5 Apr 26, 14 Apr 26, 24 Jun 26, 15 Mar 27, 5 May 27, 27 Jun 27, 3 Jan 29, 10 Dec 29, 7 Dec 34, 17 Jan 35, 25 Feb 35, 6 Mar 35, 23 Mar 35, 10 Apr 35, 1 Jun 35, 6 letters 1946-58. See: Bohr.

1882-1901, U. London: 1885-88, Asst. to N. Lockyer; 1888-1901, Demonstrator.
1901-34, U. London: 1901-15, Asst. Prof.; 1915-34, Prof.
1923-34, Royal Society of London, Yarrow Res. Prof.
1935-37, Inst. of Phys., London, Pres.

BOHR: 27 Oct 13, 9 Mar 14, 20 Apr 14, 22 Oct 14, 24 Nov 14, 6 Mar 15, 28 Jan 19, 30 Jun 19, 24 Mar 20, 15 Nov 21, 9 Mar 22, 19 Mar 22, 13 Jun 22, (BSC 2,3).
GOUDSMIT: 18 Dec 23 (60,1); 15 Jan 24 (60,2).
LANDÉ: 8 Jul 24 (4,16).

See: BOHR, GOUDSMIT.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 27 Feb 23, 12 Apr 23, 23 Jun 23, 16 Feb 24, 14 Jul 26. See: Bohr, Werner.
ROYAL SOCIETY LIBRARY, London, England. 17 letters, 1904-25.
DEUTSCHE STAATSBIBLIOTHEK, Berlin. Material at present held at the Westdeutschen Bibliothek, Marburg/Lahn, Germany [BRD]. Letters to Kayser, 24 May 09, 17 Oct 12, 31 Jul 13. (Darmstaedter Coll., Fic. 1910).

1908-15, U. Cambridge: 1914-15, Fel.; 1915, M.A.
1915-19, Milit. Serv.
1919-44, U. Cambridge: 1919-20, Fel.; 1920-32, Lect.; 1932-44, Prof.
Misc..: 1925, U. Copenhagen.

DENNISON: 12 Sep 26, 16 Oct [26], [27 Feb 27], (59,1).
GOUDSMIT: [14] Mar 29 (63,2).
HEISENBERG: 30 Nov 33, 17 Jul 34, (45,1).
KIEMBLE: 11 Nov [25] (51,6); 30 Nov 33, 13 Jul 37, (53,9)
KRAMERS: 13 Oct [25], 27 Oct [25], 17 Nov [25], 1 Dec [25], 10 Dec [25], (8,6).
KRONIG: 26 May [25], 30 Oct [28], [1928], 26 Jan [29], 30 Mar [29], 23 Mar [29], 6 Apr [29], (16,5).
SOMMERFELD: 28 [May] 35 (30,13).

See: GOUDSMIT, KEMBLE, KRAMERS, VAN VLECK.

Lecture course, "Dynamical Theory of Gases (Elementary)," notes taken by Thomas, 52 pp., Trinity College, 1922-23 (5,5).
Lecture course, "Thermodynamics and Statistical Mechanics," notes taken by Thomas, 74 pp., Trinity College, 1922-23 (5,6).
Lecture course, "The Quantum Theory of Spectra," notes taken by Thomas, 97 pp., Cavendish, 1923-24 (5,2).
Lecture course, "Recent Developments of Quantum Theory," notes taken by Thomas, 71 pp., Trinity College, 1925 (5,4).
Lecture course, "The Quantum Theory," notes taken by Dirac, 45 pp. (36,8).
Lecture course, "Recent Developments," notes taken by Dirac, 33 pp., (1925] (36,8).
Lectures, "Spinning Electrons," notes taken by Dirac, 8 pp., [1926] (36,8).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 5 Jan [23], 3 Apr 23, 5 May [23], 25 May [23], 14 Jan [24], 28 Nov [24], 16 Dec [24], 16 Jan [25], 10 Feb [25], 25 Apr [25], 29 Apr [25], 4 May [25], 17 Jun [25], 4 Dec [25], 22 Feb [26], 9 Apr 26, 11 Apr [26], 5 Oct [27], 14 Jan [28], 9 May [28], 31 Jul [28], 5 Nov [28], 17 Dec [28], 27 Feb [29], 30 Mar [29], 9 Apr [29], 6 Oct [29], 9 Nov [29], 5 Dec [29], 3 Feb [30], 19 Aug [30], 4 Sep [31], 29 Oct [31], 27 Nov [31], 9 Feb 32, 1 Mar 32, 20 Oct 32, 20 Apr [32], 13 May [32], 24 Mar [33], 21 Feb 34, 5 Mar 35, 3 Jul [35], 19 Jul [35], 2 letters 1938. See: Bohr.
RUTHERFORD COLLECTION, Cavendish Laboratory, Cambridge, England. Undated letters from Copenhagen, Princeton, N.J., University of California, Iowa.
LIBRARY OF CONGRESS, Washington, D.C. Correspondence with Veblen, 1922-28.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 28 Dec 29, 14 Jan 30. See: London.

1901-02, U. Heidelberg.
1902-06, U. Berlin: 1906, Dr. phil. with E. Warburg.
1906, U. Frankfurt-am-Main, Asst.
1906-18, U. Berlin: 1906-11, Asst. to H. Rubens;
1911-16, Priv.-Doz.; 1916-18, a. o. Prof. 1914-19, Milit. Serv.
1918-20, Kaiser Wilhelm Inst. Phys. Chem., Berlin-Dahlem, Member.
1920-33, U. Göttingen, Prof. and Dir., II. Phys. Inst.
1934-35, U. Copenhagen, Guest Prof.
1935-38, Johns Hopkins U., Prof. 1938-47, U. Chicago, Prof.

Six sessions, 115 pp. transcript.

BOHR: 24 Oct 20, 22 Nov 20, 3 Dec 20, 19 Feb 21, 2 Apr 21, 15 Apr 21, 12 Jul 21, 28 Jul 21, 14 Aug 21, 24 Aug [21], 25 Sep 21, 29 Sep 21, 10 Nov 21, 6 Dec 21, 21-Feb 22, 2 Jun 22, 29 Jul 22, 23 Dec 22, (BSC 2,4)
GERLACH: [May 21], 26 Jul 21, 15 Feb 22, 15 May 22, 17 Nov 22, 2 Dec 22, 27 Jan 23, 15 Feb 23, 23 Apr 23, (19,3).
GOUDSMIT: 23 Mar 27, 28 Mar 27, (61,2), 17 Jun 27 (61,4).
KEMBLE: 19 Dec 27 (51,6).
KRAMERS: 31 Jul 24 (8,6).
LANDÉ: 21 Dec 19, 9 Jan 20, (4,16).
SOMMERFFLD: 18 Jun 13 (30,13).

See: BOHR, GOUDSMIT, KRAMERS.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 5 May 23, 15 Mar 24, 8 Sep 24, 21 Oct 24, 25 Oct 24, 4 Nov 24, 5 Mar 25, 20 Apr 25, 24 Apr 25, 14 Nov 25, 20 Nov 25, 31 Dec 25, 9 Jul 26, 29 Jul 26, 29 Jul 26, 2 Dec 26, 1 Jan 27, 26 Aug 33, 5 letters 1945-48. See: Bohr, Wheeler.
LIBRARY OF THE SWEDISH ACADEMY, Stockholm, Sweden. Letter to Oseen, 21 May 28.
EINSTEIN COLLECTION, Princeton, N.J. Correspondence with Einstein, 2 items 1921-52.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 29 Nov 30, 23 Aug 47.

Franck left many papers at the University of Chicago which the Department of Special Collections of the Library of that University is now investigating; presumably the papers will be deposited there. The collection may not contain many items of an early date, since, according to Franck's former secretary, much material was left at the Göttingen Institute when Franck emigrated in 1934.

1913-18, U. St. Petersburg: 1917, Master's degree.
1918-21, U. Crimea, at Yalta, then at Simferopol, Instr.
1921-52, Polytechn. Inst., Leningrad, Prof.
Misc.: 1925-26, Rockefeller Found. Fel. U. Berlin, U. Hamburg, and U. Göttingen. 1930-31, U. Minnesota, Lect.

DARWIN: 16 Mar 27 (36,1).
SOMMERFELD: 8 Mar 28, 13 Mar 28, 22 Nov 31, (30,14).

BOHR COLLECTION, Copenhagen, Denmark, 3 Letters to Bohr, [1936], 1 letter [undated]. See Bohr.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letter to London, 18 Aug 31.

c. 1914-16, U Copenhagen: 1916, Dr. phil.
c. 1918, U: Lund.
1919-20, Columbia U., American-Scandinavian Found. Fel.
1920-21, Harvard U., Asst.
1921-27, Cleveland Clinic Found., Biophysicist.
1927-28, U. Copenhagen.
1928-55, Cold Spring Harbor, Long Island, N.Y., biophysicist.

BOHR: 26 Oct 14, 1 Dec 14, 5 Jun 19, 23 Oct 19, 6 Feb 20, 29 Sep 20, (BSC 2,4).

See: BOHR.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 3 May 24, [1925], 25 Sep 25, 18 Jan 26, 31 Oct 27. See: Bohr.

1912-14, U. Berlin, then U. Munich.
1914-c. 15, Milit. Serv.
1916-18, U. Tübingen.
1918-20, U. Munich: 1920, Dr. rer. nat. with A. Sommerfeld.
1922-29, Techn. Hlochsch. Stuttgart, Asst.: 1924-29, Priv.-Doz.; except 1925-27, Intl. Educ. Board Fel., U. Zurich and U. Copenhagen.
1929-34, Techn. Hochsch. Hanover, o. Prof.
1934-43, U. Breslau, o. Prof.
1934-43, Techn. Hochsch. Breslau, o. Prof.

LANDÉ: 28 Apr 24, 24 Oct 24, 31 Oct 24, 13 Aug 26, 25 Oct 26, 1 Jun 27, 21 Jul 27, (4,4).
SOMMERFELD: 3 letters 1936-44 (30,14).

Memoirs of 1925-27 concerning Schrödinger and the wave equation, 30 pp., 1963 (66,8).

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 20 Jan 30, 1 May 32. See: Bohr.
DUKE UNIVERSITY ARCHIVES, Durham, N.C. Letters to London, 21 Apr 28, 1 Oct 28, 5 Oct 28, 24 Nov 28, 25 Nov 28. See: London.

1923-37, Inst. Phys. and Chem. Res., Tokyo.
1928-29, Studied in Europe.

BOHR COLLECTION, Copenhagen, Denmark. Letters to Bohr, 7 Aug 28, 22 Jan 29, 15 May 29, 15 Aug 37. See: Bohr.