. Einstein to Pauline Einstein, Apr. 28, 1910.
10
. Student petition, University of Zurich, June 23, 1910, CPAE 5: 210.
11
. Repeated in lecture by Max Planck, Columbia University, spring 1909; Pais 1982, 192; Folsing, 271.
12
. Einstein to Jakob Laub, Aug. 27, Oct. 11, 1910; Count Karl von Sturgkh to Einstein, Jan. 13, 1911; Frank 1947, 98–101; Clark, 172–176; Folsing, 271–273; Pais 1982, 192.
13
. Frank 1947, 104. Frank has the visit occuring in 1913, but in fact it occurred in Sept. 1910 when Einstein was in Vienna for his official interview about the Prague professorship. See notes in CPAE 5 (German version), p. 625.
14
. Einstein to Hendrik Lorentz, Jan. 27, 1911.
15
. Einstein to Jakob Laub, May 19, 1909.
16
. Einstein to Hendrik Lorentz, Feb. 15, 1911.
17
. Pais 1982, 8; Brian 1996, 78; Klein 1970a, 303. The Ehrenfest description is from a draft of his eulogy for Lorentz.
18
. Einstein, “Address at the Grave of Lorentz” (1928), in Einstein 1954, 73; Einstein, “Message for Hundredth Anniversary of the Birth of Lorentz” (1953), in Einstein 1954, 73. See also Bucky, 114.
19
. Mileva Mari
to Helene Savi
, Jan. 1911, in Popovi
, 30; Einstein to Heinrich Zangger, Apr. 7, 1911.
20
. Frank 1947, 98.
21
. Max Brod,
(New York: Knopf, 1928); Seelig 1956a, 121; Clark, 179; Highfield and Carter, 138.
22
. Einstein to Paul Ehrenfest, Jan. 26, Feb. 12, 1912.
23
. Einstein, “Paul Ehrenfest: In Memoriam,” written in 1934 for a Leiden almanac and reprinted in Einstein 1950a, 132.
24
. Klein 1970a, 175–178; Seelig 1956a, 125; Folsing, 294; Clark, 194; Brian 1996, 83; Highfield and Carter, 142.
25
. Einstein to Paul Ehrenfest, Mar. 10, 1912; Einstein to Alfred Kleiner, Apr. 3, 1912; Einstein to Paul Ehrenfest, Apr. 25, 1912. Einstein to Heinrich Zangger, Mar. 17, 1912: “I would like to see him my successor here. But his fanatical atheism makes that impossible.” Zangger’s letter was part of material released in 2006 and is published as CPAE 5: 374a in a supplement to vol. 10.
26
. Dirk van Delft, “Albert Einstein in Leiden,”
, Apr. 2006, 57.
