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.
Freundlich![1]
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
me.–[2]
I read the lucid and fine article by Kohlschütter on Eddington’s stellar
theory.[3]
At lower temperatures the assumed molecular weight may not apply,
however.[4]
Are the “giant” and “dwarf” stars distinguishable by their spectral type or
not?[5]
At equal mass the latter ought to show a larger gravitational effect than the for-
mer,[6]
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]
radius).[7]
Best regards, yours,
A. Einstein.
9. To Karl Scheel
[17 March 1919]
[Not selected for translation.]
10. To Paul Ehrenfest
[Berlin,] 22 March 1919
Dear
Ehrenfest,[1]
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,
relatively.)[2]
I would also very much like to meet Bohr, this person of such mag-
nificent intuitive
talent.[3]
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
summer.[4]
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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