1 3 0 D O C S . 1 5 1 , 1 5 2 O C T O B E R 1 9 1 9 Did I tell you about my purported discovery of eka-iodine on plates by Siegbahn, as an admixture of bromine? It turned out to be a mistake a still not completely clarified devilish trick was involved. 151. To Pauline Einstein Leyden, Sunday. [26 October 1919] Dear Mother, I’ve been here with Ehrenfest in Leyden for a week already and am having a nice time. The weather has been fine throughout, which we made ample use of by going on walks. In the evenings we play music. Of course there is much talk about science as well. Yesterday I attended the meeting at the Academy with Ehrenfest and Lorentz, where Lorentz spoke about general relativity and the results of the English expeditions —to please me, of course. The result is now definite and signifies a perfect verification of my theory. I am very happy that at last it seems possible that you can be brought to us now, after all. Though we can’t attend to you materially as completely as is possible at the sanatorium in Lucerne, it will still be nicer for you, because we can all be with you often. Else will arrange it all very well nor does she leave us without at- tention. At any rate, it is a good sign that your doctor has no more doubts about al- lowing the trip. Next Sunday I am coming back to Berlin, only to depart again on Nov. 12th aga for a few days to Rostock. But then I’m done with it for some time. Hoping to see you soon in Berlin in good spirits, I am with best regards yours, Albert. Best regards to the nurse, Mrs. Dann, Maja, Pauli. 152. From Max von Laue Würzburg, 27 October 1919 Dear Einstein, From my last letter you will have gathered that I was not yet completely fa- miliar with the literature on the Harress experiment when I wrote it. Just three days ago, Prof. Knopf, with whom I have been exchanging correspondence about this experiment for 2½ months now, mentioned the publications by Harzer and you in the Astronomische Nachrichten.