27
. Einstein to Heinrich Zangger, Nov. 7, 1911.
28
. An invitation from Ernest Solvay, June 9, 1911, CPAE 5: 269; Einstein to Michele Besso, Sept. 11, Oct. 21, 1911.
29
. Einstein, “On the Present State of the Problem of Specific Heats,” Nov. 3, 1911, CPAE 3: 26; the quote about “really exist in nature” appears on p. 421 of the English translation of vol. 3.
30
. Discussion following Einstein lecture, Nov. 3, 1911, CPAE 3: 27.
31
. Einstein to Heinrich Zangger, Nov. 7 and 15, 1911.
32
. Einstein to Michele Besso, Dec. 26, 1911.
33
. Bernstein 1996b, 125.
34
. Einstein to Heinrich Zangger, Nov. 7, 1911.
35
. Einstein to Marie Curie, Nov. 23, 1911. (This letter is included at the beginning of CPAE vol. 8, not vol. 5, where it would have fit chronologically had this letter been available when that volume was published.)
36
. Mileva Mari
to Einstein, Oct. 4, 1911.
37
. Overbye, 201. Einstein’s quote is from a letter to Carl Seelig, May 5, 1952.
38
. Reiser, 126.
39
. Highfield and Carter, 145.
40
. Einstein to Elsa Einstein Lowenthal, Apr. 30, 1912; regarding her keeping the letters, CPAE 5: 389 (German edition), footnote 12.
41
. Einstein to Elsa Einstein, Apr. 30, 1912; Einstein “scratch notebook,” CPAE 3 (German edition), appendix A; CPAE 5: 389 (German edition), footnote 4.
42
. Einstein to Elsa Einstein, May 7 and 12, 1912.
43
. Einstein to Michele Besso, May 13, 1911; Einstein to Hans Tanner, Apr. 24, 1911; Einstein to Alfred and Clara Stern, Mar. 17, 1912.
44
. Mileva Mari
to Helene Savi
, Dec. 1912, in Popovi
, 106.
45
. Willem Julius to Einstein, Sept. 17, 1911; Einstein to Willem Julius, Sept. 22, 1911.
