D O C U M E N T S 1 3 9 – 1 4 1 A P R I L 1 9 2 2 1 3 5 force me to. All in all: Wait before executing the alternative. Maybe you will want to thank me for this small modification. Again, most cordially yours truly, Oppenheim. 139. To Lucien Chavan[1] [Paris, 10 April 1922] After ten productively busy days in Paris, I send you friendly greetings your old A. Einstein 140. From Paul Langevin Paris, 10 April 1922 My dear Friend, I think this letter, along with its enclosure, will reach you at the moment of your return to Berlin, to tell you one more time how happy I was to see you again and to work with you toward repairing, within the limits of our powers, the immense dam- age caused by the war. I would like to know whether you returned without undue fatigue. Rest assured that your visit, despite the effort it demanded of you, was an excellent thing and that it produced here the best impression, far exceeding what I would have dared to hope. I had the embarrassment of not finding the slip of paper on which you had writ- ten the address to which I should send your money.—[1] Would you please give it to me again so that I can acquit myself of this obligation as soon as possible? Please present my respectful regards to Mrs. Einstein and believe me to be your very affectionately devoted servant, P. Langevin. 141. To Ilse Einstein Kiel, Tuesday [11 April 1922] Dear Ilse, So, I made it here safely today at 2 o’clock in the morning and received your correspondence.[1] The court hearing is only taking place tomorrow.[2] I still have to stay here on Thursday because of an experiment.[3] So I’m not coming until