D O C U M E N T 1 1 5 S E P T E M B E R 1 9 2 3 183
Einladung erhalten. Indess m[u]ss ich eins bemerken. Genau genommen kann man
nicht sagen, dass, wie Sommerfeld meint, Deutsche ausgeschlossen seien. In den
Satzungen ist mit keinem Worte die Rede
davon.[12]
Ich könnte sagen, die Tür ist
nicht geschlossen, sondern steht angelehnt und in Zukunft hoffen wir sie zu öffnen.
In den nächsten Jahren wird das aber nicht gehen; das wird auch Sommerfeld ver-
stehen. Wir dürfen nicht vergessen, dass es sich hier um ein Institut handelt, das ge-
rade in Belgien seinen Sitz hat, um die Schöpfung eines Mannes, der schwer unter
den Ereignissen der Kriegsjahre gelitten
hat.[13]
Mit herzlichen Grüssen, auch von meiner Frau, treulich Ihr
H. A. Lorentz
ALS (NL-LeRM). Kox 2008, pp. 558–559. [16 556]. There are perforations for a loose-leaf binder at
the left margin of the document.
[1]Lorentz had turned seventy on 18 July. Herman Haga (1852–1936) was Professor Emeritus of
Physics at the University of Groningen; Pieter Zeeman (1865–1943) was Professor of Physics at the
University of Amsterdam; Paul Ehrenfest; Willem de Sitter.
[2]The daughters, Geertruida de Haas-Lorentz (1885–1973) and Johanna Leemhorst-Lorentz
(1889–1980); the sons-in-law, Wander J. de Haas (1878–1960), Professor of Physics at the University
of Groningen, and Hendrik Carel (Henri) Leemhorst (1884–1974), the son Rudolf Lorentz (1895–
1977); and the future daughter-in-law, Maria van Vollenhoven (1900–?). At the time, Lorentz actually
had eight grandchildren: Albert (1911–1967), Aletta (1913–?), Johanna (1916–?), and Hendrik
(1919–?) de Haas; and Johann (1913–2000), Hendrik (1915–?), Johanna (1917–?), and Jan (1921–?)
Leemhorst.
[3]Lorentz’s Monday morning lectures on recent developments in physics, which he had been
delivering since his move to Haarlem in 1912.
[4]Doc. 78.
[5]Lorentz and Einstein first met in February 1911, when Einstein visited Leyden to give a lecture
(see Vol. 5, Calendar/Chronology). Einstein 1911h (Vol. 3, Doc. 23), which further elaborated on
gravitational time dilation after Einstein’s original formulation of the equivalence principle in
Einstein 1907j (Vol. 2, Doc. 47), was submitted on 21 June 1911.
[6]Aletta Lorentz-Kaiser (1858–1931).
[7]The second session of the International Committee on Intellectual Cooperation had taken place
from 26 July to 2 August 1923.
[8]Marie Curie-Sk¤odowska (1867–1934) was Professor of Physics at the Sorbonne.
[9]George E. Hale (1868–1938) was honorary director of Mount Wilson Observatory.
[10]Paul H. Périgord (1882–1959) was Professor of European History at the California Institute of
Technology, Pasadena. Lorentz had spent the first months of 1922 at the California Institute of Tech-
nology (see Paul Ehrenfest to Einstein, 4 February 1922 [Vol. 13, Doc. 45]).
[11]Doc. 102. The fourth Solvay Congress was to be held in Brussels in April 1924.
[12]Arnold Sommerfeld. According to article 9 of the Institute’s statutes, new members were to be
appointed by the administrative committee on the basis of recommendations made by the scientific
committee (see Solvay 1923, p. 5).
[13]Ernest Solvay (1838–1922) was the co-founding gérant of Solvay & Cie. and founder of the
Solvay Congresses. The German invasion and occupation of Belgium led to serious hardships for the
Solvay chemical company. Solvay himself was involved in the establishment of a relief organization
for the Belgian population (see Bertrams et al. 2013, pp. 151–158).
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