D O C S . 8 1 0 M A R C H 1 9 1 9 9
8. To Erwin Freundlich
[Berlin,] 1 March 1919
Dear Mr.
Nernst recently asked me about your progress report (as specified in our con-
tract) for the year 1918; could you please send it out to
I read the lucid and fine article by Kohlschütter on Eddington’s stellar
At lower temperatures the assumed molecular weight may not apply,
Are the “giant” and “dwarf” stars distinguishable by their spectral type or
At equal mass the latter ought to show a larger gravitational effect than the for-
and similarly among the “giant st[ars],” A and B’s gravitational effect will
be larger than M and K’s due to the much higher density (sm[aller]
Best regards, yours,
A. Einstein.
9. To Karl Scheel
[17 March 1919]
[Not selected for translation.]
10. To Paul Ehrenfest
[Berlin,] 22 March 1919
For so long have I, beast that I am, not answered your heartwarming invitation!
But that was because I did not know whether I ought to say yes or no. I so much
want to see you all, you know, but on the other hand, traveling is so dreadful, par-
ticularly for someone with queasy insides. (By the way, I’m feeling very well,
I would also very much like to meet Bohr, this person of such mag-
nificent intuitive
But it cannot be. For in January–February I lectured in
Switzerland for 4 weeks and must lecture there for 4 weeks again in the
I cannot be away from here even more without it becoming indecent. Besides, I am
very much behind with my course here, partly because of the Zurich lectures, partly
because many courses here had to be canceled as a result of the university’s closing
following the unrest.[5] Finally, I am passionately occupied with a problem in gen-
eral relativity that, night or day, won’t leave me in peace.[6] Politics disappoint me
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