4 1 4 D O C U M E N T S 4 6 0 , 4 6 2 M A R C H 1 9 2 9 460. To Siegfried Bieber[1] [Berlin,] 21 March 1929 Dear Mr. Bieber, I hasten to express my deepest thanks for the wonderful gift that you, Mr. Jeidels, and Mr. Goldman picked out for me.[2] With incubation, the plan has in fact grown amazingly.[3] That proceeds simply from the fact that such a real sportsman has big ideas in his head that we others never dream of. Now the thing is worked out in such a way that it will elicit the justified envy of all gods and men and will be my greatest delight. By May it should be ready! I’m floundering under the deluge of paper from my birthday, but it’s beginning to thin out. Kind regards and best wishes to you and your wife[4] from your happy and grateful A. Einstein Because I don’t have Mr. Goldman’s address, I ask you to forward the note to him when convenient. 461. From Tullio Levi-Civita[1] Via Sardegna 50, Rome, 21 March 1929 [See documentary edition for English translation.] 462. To Marie Barthelts [Berlin, 22 March 1929] I still remember very well our music making twenty-nine years ago.[1] In the meantime, I have fiddled around a good deal and also otherwise lived such a re- markable and eventful life full of work that the promised cock-a-doodle-doo remained stuck in my throat.[2] That must have been at the end of 1905. Your note was the most beautiful thing that happened on the occasion of my fiftieth birthday. It brought everything from back then back to life again for me, the happy, even if