1 5 6 D O C U M E N T S 1 7 2 , 1 7 3 A P R I L 1 9 2 2 to have contributed to the restoration of friendly exchanges between French and German scholars. Please, dear Colleague, accept the expression of my sincerest sympathy, A. Einstein. 172. To Moritz Schlick[1] Berlin, 28 April 1922 Dear Mr. Schlick, Mr. Koehler, who as a philosopher and psychologist has now been called away from Göttingen to Berlin,[2] asks me[3] to put in a word for Dr. Max Wertheimer,[4] taking into account that the latter could eventually be appointed to Göttingen or Kiel.[5] I am the more happy to act on this invitation as I personally know Mr. Wertheimer well and value him very highly as a person.[6] The focus of Wertheimer’s interests lies in the field of psychology, where he has been mainly creatively employed. Epistemologically he is less suited than Reichenbach to the extent that he is much less acquainted with the exact sciences than the latter.[7] In any event he is no follower of the petrified philosophy of words (Kant Society) but an active person who can think and experience for himself and in this sense would also have a liberating effect on young people. I have a slight impression that psy- chology is being neglected somewhat in Germany compared to epistemology. These lines are not an attempt to influence you in any way, rather just to point out an option to you that may not have occurred to you in view of your own field of expertise. This letter needs no reply, of course. With cordial regards, yours, A. Einstein. 173. To Mario Viscardini[1] Berlin, 28 April 1922 Highly esteemed Sir, With reference to your letter of 21 Mar. this yr.[2] and the enclosed article, I inform you of the following: The hypothesis expressed in the article that light in empty space has constant velocity c with respect to the light source, not the system of coordinates, was first discussed extensively by the Swiss physicist W. Ritz[3] and