D O C U M E N T S 1 2 2 , 1 2 3 D E C E M B E R 1 9 2 5 1 4 3 same interest as to questions of principle. There is hardly a subfield in the physical sciences that you have not furthered at some time or another by your investigations. May you be creative and active for many more years, for your own pleasure, for the profit of science, and for the benefit of the world around you. The Prussian Academy of Sciences 122. From Max Planck Berlin NW 7, Unter den Linden 38, 4 December 1925 Dear Colleague, Your address is now beginning to look not as nice as you had imagined it. Be- fore the reading and decision making in the plenum of the Academy, I received a letter from Roethe, in which he signaled opposition if the print version of the talk in which you discuss Lorentz’s personality in detail remains unchanged. There is no doubt that other members of the Academy would have joined the opposition, and that then a very unpleasant debate, quite unworthy of the person who is the ob- ject of the celebration, would have ensued. In order to avoid this, I decided—and believed I was also acting in your best interest—to respond to Mr. Roethe in a let- ter, a copy of which I am enclosing for you. So, I am asking you, after the fact, for approval of my action, which I had to take since the time was too limited to be able to ask you again. The address will be forwarded from here to you at the home of Mr. Ehrenfest in the next few days. Have a very nice celebration and greet Lorentz, Bohr, Ehrenfest, Kamerlingh Onnes, Zeeman, and whomever else you wish. Yours truly, Planck 123. From Erwin Schrödinger Zurich, 4 December 1925 Dear Professor, Thank you very much for your kind letter of 14 November, which I have not responded to yet only because I wanted to present the finished elaboration right away (i.e., finished for my part), which I am sending out now in the same post.