1 6 6 D O C S . 1 9 5 , 1 9 6 D E C E M B E R 1 9 1 9 telegrams by the patient’s doctor reporting that the transfer of the patient is becom- ing more and more difficult by the day. With utmost respect, A. Einstein. 195. To Richard von Mises Berlin, 6 December 1919 Esteemed Colleague, I studied the paper[1] sent to me together with the one dealing with the founda- tions of probability calculus[2] with great interest. With your clarification of the fundamental concepts you really have achieved something of great merit. It is also interesting to see how far one can go without the ergodic hypothesis.[3] The main question, whether the equipartition theorem from mechanics necessarily follows or whether this is not the case, does remain open as before, however! I firmly believe that, ultimately, the answer will be in the affirmative.[4] At present, I cannot submit this interesting paper to the Academy, unfortunately, as much as I would like to from the thematic point of view. For the Academy has resolved, because of prohibitive printing costs, that papers by nonmembers not be allowed to exceed seven printed pages.[5] Although I did join the extended editorial committee of the reorganized Mathe- matische Annalen, I do not know when the first issue of the renewed journal is com- ing out. Under these conditions it is probably best that I keep your manuscript until you let me know to which editor it should be forwarded.[6] With amicable greetings, yours, A. Einstein. 196. From Felix Ehrenhaft Vienna IX., 5 Boltzmann Alley, 6 December 1919 Dear Mr. Einstein, In the same mail I am sending you an official invitation to the Chemical-Physical Society in Vienna,[1] whose president I currently am, and I would like to take the liberty of putting a personal emphasis on the request by this society. It would be extremely interesting to hear a presentation of your novel concepts from you per- sonally, and I would expect extraordinary profit and immeasurable inspiration,