D O C U M E N T 2 4 4 A P R I L 1 9 2 6 2 5 3 an opinion, despite a great deal of effort. Mother Nature almost always gives us the runaround, as little creatures and as intellectual beings. I believe you should follow up on a call for a larger sphere of activity.[3] For man must try to impart to his work the most lasting impact, particularly when it is a mat- ter of something as serious as in your case. So, I encourage you to do it. I still don’t know anything about the mortgage.[4] Thank you very much for the information. I am writing to Mileva in today’s mail as well that Albert should sim- ply visit you to discuss the matter with you.[5] I have an additional reason for that. Albert has gotten it into his head to marry a girl (Miss Knecht), who is 10 years older than him, and whose mother is in a mental institution.[6] Even the girl herself, and especially the family, seems not to be physically too well. I shudder to think of the offspring. I have already fought very energetically against it. However, the daughter of Eve is energetic and Albert is hardheaded. Perhaps you can try it with a wise word. I like De Broglie’s idea, but it’s not leading anywhere yet.[7] Other than the note in Naturwissensch[aften],[8] I have also concocted a few other experiments about canal rays, which could also teach something about the radiation processes.[9] How mysterious and dark things ultimately are and—remain. Warm regards to you and yours, your A. Einstein 244. From Hans Reichenbach Ostheim, Stuttgart, Teckstr. 75, 4 April 1926 Dear Mr. Einstein, I cordially thank you for your letter[1] and for forwarding the reply by Dr. Bertling.[2] Eventually, I will write to the man, although the impression he makes does look rather meager, as you write. It makes no sense to write to Liebert [3] I know Liebert quite well myself, but the Kant Society is a veritable department store for all sorts of philosophy and, moreover, is always penniless. Now to my note![4] You apparently misunderstood this matter in the direction I already feared, namely, by interpreting it as much more fundamental than was meant. The actual unsolved physical problem is, of course, specifically to get field equations allowing the electron as a solution and this issue is not what I wanted to contribute to. Rather, I just wanted to show that the old theory of relativity, that is, the one without such field equations, can be rewritten in such a way that a graphic description of it in the Weyl space is possible.[5] My idea is thus neither true nor