D O C U M E N T 2 3 9 M A R C H 1 9 2 6 2 4 7 writing philosophical works ¢but, isn’t self-awareness also higher² this also ¢earns² can, under certain circumstances, ¢deservingly² earn recognition. Respectfully yours, in sincere gratitude, A. E. So, I have thus been rewarded for the fact that I have never written philosophical treatises. Had I done so, my… would have[4] 239. To Hans Reichenbach [Berlin,] 31 March 1926 Dear Mr. Reichenbach, The man from the Amerika-Institut[1] wrote me the enclosed letter,[2] from which it unfortunately seems to emerge that this gentleman’s connections with American universities are slim. But perhaps you can write to him sometime any- way. If I only knew whom I could write to, I would do so right away. So, you have come among theoretical physicists, and chosen a bad area, at that. Of course I immediately found a few things to complain about.[3] First of all, the statement is quite arbitrary.[4] Second, no metric belongs to your there it is unnatural to assign a metric to a summand γ of Γ.[5] Third, your equation of motion makes no physical sense because it describes the behavior of matter for only one value of the ratio between electric and ponderable density.[6] Finally, the theory is not a connection between electricity and gravitation insofar as there is no mathematically unified field equation that simultaneously provides the field law of gravitation and that of electromagnetism it does not provide a connec- tion between electricity and gravitation either, in the sense that it would tell us from which electromagnetic quantities ¢expressions² the gravitational field arises.[7] —I would not publish this otherwise the same will happen to you as to me, who must disown his own children. Best regards, your A. Einstein ϕμν τ gμσ fντ σρ ∂f ∂xρ --------- - –= Γμν τ