D O C . 2 9 3 F E B R U A R Y 1 9 2 0 2 4 5 an essential expansion of experimental physics with respect to filling the other chairs, but rather that he is considerably better suited than our other countrymen. In the event that you do not want to go into more detail, it would be very valuable for me if you would at least empower me to make use of a part of your first letter (page 2, roughly from “The force of his intellectual vitality . . .” until “I am con- vinced that . . .” I request your reply by express delivery so that it does not arrive too late. It is my great pleasure through this affair to be able to open communications, if only by letter, with such a pioneering scientist and sign with utmost respect as yours truly, R. Wegscheider. Note at head of letter: “Letter can be presented to the faculty. New letter to follow!” 293. To Arthur S. Eddington Berlin, 2 February 1920 Dear Professor Eddington, Today I received your kind letter, which pleased me exceedingly despite the tragicomical outcome of the medal affair. How insignificant that is against the self-sacrificing and fruitful labors you and your friends devoted to the theory of rel- ativity and its verification! The greater will be my pleasure in accepting your in- vitation, for now my trip is purely of a private nature. My irritating ignorance of the English language will disturb less. Your offer to come to Holland sometime pleased me especially too  I shall gladly take up the same, should the inscrutable authorities upset my English travels. (One never can tell, even though I am a Swiss citizen.) Regarding the problem of spectral redshift in the Sun, two young physicists, Grebe and Bachem in Bonn, have made a remarkable advance. Like Evershed, Schwarzschild, and St. John, they are working on the cyanogen band, and their ob- servational results agree with those of Evershed and Schwarzschild very satisfac- torily. Through (objective) photometric analyses of the individual lines they found that most of the observed lines are asymmetric in the line-rich solar spec- trum. Upon eliminating the distorted lines they find a quantity for the redshift that is in very good agreement with the theory. With warm regards, yours.