3 2 8 D O C U M E N T 3 1 5 J U L Y 1 9 2 6 314. From Felix M. Warburg [New York,] 1 July 1926 [See documentary edition for English text.] 315. To Emil Rupp [Berlin,] 2 July 1926 Dear Mr. Rupp, You are entirely right that you cannot put Lenard in a situation where he would have to take a stand regarding our joint project.[1] However, I must finalize my own manuscript[2] and submit it before my departure.[3] I would therefore like to ask you to return said document to me. Next Wednesday, I have to give a report regard- ing this matter at the local colloquium,[4] where I will have to discuss your exper- imental results as well. I am assuming you agree with this. If you are not sending your manuscript[5] until later (i.e., it would not be in my hands by next Thursday), then send it to Planck or Laue, who will submit it in one of the following meetings.[6] I will then make sure that the two papers will be printed one after the other. Please see to it that your work will not exceed the length of one print sheet. If necessary, you could send a more detailed exposition to the Annalen. I am glad you were able to decide the questions experimentally in particular, the second experiment[7] is of great interest, in my opinion. Best regards, your A. Einstein Translators’ note: Based on a translation by Doris Lonk and Tilman Sauer. 316. To Jakob Grünberg[1] [Berlin, after 2 July 1926][2] [Not selected for translation.]