D O C U M E N T 3 1 6 J U L Y 1 9 2 2 2 4 7 adjustment respecting orientation fully to the adjustment into quantum states in general, i.e., therefore, e.g., also only allow in the case of suitable electric charges a spontaneous adjustment to the quantum orbits for the oscillations of a crystal lat- tice and the rotations of a molecule, then one would come into evident conflict with experience regarding the specific heats, e.g., of diamond and gaseous H2. § 7. The enumerated problems show how unsatisfactory both interpretation attempts discussed here are for the results found by Stern and Gerlach. Bohr’s idea—that absolutely no definite quantization takes place in more complicated fields—has been left out of the discussion. Leyden-Berlin, May–June 1922. 316. From Paul Ehrenfest [Leyden,] 30 July 1922 Dear, dear Einstein, Since seeing you, I was in Göttingen (Bohr) [1] then Joffe was here with me (under my whip, finished writing his paper, thank God, that had been lying around for 15 years).[2] – Then my American brother was visiting for 12 days with (very nice!) wife and eldest daughter (very nice, clever girl, but floating completely on superficiality).[3] Just today they are in Berlin in transit, Hamburg–Berlin–Vienna.– My brother is a talented, competent fellow—looks immensely similar to me (looks just as old as me although 10 years older) but he’s an “instant-future” person, through and through—very very uncontemplative. Very hands-on, kindhearted, helpful.—Well, that was a brisk whirlwind blowing through our house.– As I’m supposed to see [him] again in Vienna (with my 3 other brothers[4] –), I had to rest a little and therefore did not accompany him to Hamburg and Berlin. _______________________________________________________________ When I picked him up in Antwerp, I saw the old Flemish paintings there—par- ticularly Rogier van der Weyden and Quentin Matheys left an enormous impression on me!!– A (self?)-portrait of Rogier van der Weyden should be hanging among the Kaufmann collection in Berlin.—I saw it in reproduction.—That’s magnificent. Do go and look at it![5] _______________________________________________________________ I plan to travel the day after tomorrow (1 August) via Frankfurt to Vienna.– From there I’ll send the manuscript on “Stern–Gerlach”—which is ready for press, to you for publication in Zschr. d. Physik.– I am sending it to you because I added 5 lines right at the end that would take a weight off my chest, but that you perhaps