MAY 1920–DECEMBER 1920
This listing, with abstracts of the content of all correspondence and documents, consists of
six elements: (1) All known letters from and to Einstein and letters written or received on
Einstein’s behalf by his secretary that fall within this period, and are excluded from the se-
lection of texts on grounds explained in the Editorial Method. Variants of documents that
are presented as texts do not appear in the Calendar, nor do drafts that differ insignificantly
from final versions that are presented. (2) Letters written to the board of directors and board
of trustees of the Kaiser Wilhelm Institute of Physics (KWIP), and to the administration of
the Kaiser Wilhelm Society, as well as third-party documentation of Einstein’s role as di-
rector of the KWIP, his political involvement, other references to public activities, and his
participation in the Prussian Academy of Sciences (PAW). No attempt is made, however,
to document Einstein’s mere attendance at class or plenary sessions of the Academy (for a
record of his attendance, see Kirsten and Treder 1979, pp. 207–286), nor his acknow-
ledgment of the actions of other members of the PAW. Records of preliminary procedural
stages in administrative matters of more substantial calendar items, as well as subsequent
procedural stages when no feedback is requested, are also excluded. (3) References to Ein-
stein’s writings that appear in the Writings series of the edition. In the case of published
papers, the date refers to receipt by a journal, unless indicated otherwise, such as submis-
sion dates to the PAW. (4) Interviews with Einstein. No attempt is made, however, to in-
clude newspaper articles, in which excerpts from earlier interviews or significant citations
therein are republished, nor material from interviews that is expanded and worked into a
monograph. (5) References to significant events in Einstein’s life, as well as significant po-
litical events. (6) Aphorisms and signed dedications by Einstein, and signed dedications to
Einstein by authors of books and articles.
If only an archival number in square brackets is given, the source is the Albert Einstein Ar-
chives at the Jewish National and University Library in Jerusalem. Otherwise, the location
of the original follows each entry. If the location is unknown, the source of the photocopy
or transcript used is given. Symbols for documentary repositories follow the guidelines in
The Library of Congress National Union Catalogue (see the list of Location Symbols).
Newspaper titles without date refer to the issue published on the date of the entry.
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