D O C U M E N T S 2 5 3 , 2 5 4 A U G U S T 1 9 2 8 2 4 7 253. To Mileva Einstein-Marić Scharbeutz bei Lübeck [on or after 10 August 1928][1] Dear Mileva, It’s a terrible shame that we allowed ourselves to be bullied about Tetel. It would have been so marvelous here for Tetel.[2] If he can still get excused from school for illness, immediately send him here to me, so that he can finally keep himself healthy. It has also done me a world of good. I’m staying here until the end of Sep- tember. I’d like to have Tetel here that long as well. My heart no longer bothers me much, but I’m still a little weak on my feet and have to avoid being too active. And how happy I am that there are no doctors here! That would also be excellent for Tetel, who tends toward hypochondria anyway. Send him right away, if you can ar- range it and don’t ask any doctor. It’s warm here. Private house, beach, wonderful trees, everything is wonderful and Tetel will enjoy happy days and soon forget that he has a body with which he has to be concerned. I’m writing you this letter in the event that you are not with Tetel. I’m sorry that I was not able to visit you this summer. But just as earlier, I probably won’t get much better, and so I also won’t be more able to travel. Wishing you many good, beautiful days, your Albert 254. To Roland Weitzenböck [Scharbeutz,] 16 August 1928 Dear Colleague, I thank you for the interesting paper for the Sitzungsberichte. It will be submitted to the Academy immediately at its first meeting, which is, however, only at the end of October.[1] Regarding the comments in your accompanying letter,[2] it is indeed the case that I set , or in terms of first-order quantities, exactly .[3] My equations in the second note are all given only in terms of 1st order quantities (i.e., except for quantities of precisely 2nd order in thus the term is left out, since it is of 2nd order). The are ini- tially not covariant with respect to Lorentz transformations. But the transformations can be restricted in such a way that the assume tensor character. One namely combines the infinitesimal transformation ) with the corresponding rotation of the n-Bein frames. Then the h a  a k a – = h a   a k a – = 2  k a x  ---------- - k a x  ---------- - –   x k k a h  x  d a x a = d    x D  + = D   –D =