D O C U M E N T S 8 1 , 8 2 S E P T E M B E R 1 9 2 5 8 9 whether you share this view, because it appears from your account as if other hy- potheses were necessary for the implementation, with the exception of the one si- lently used here, namely, that the (kinetic) energy vanishes for the 1st quantum state.[10] Kind regards, your A. Einstein 81. To Margot Einstein [Berlin, between 30 September and 16 October 1925][1] Dear Margot, I see with pleasure from your letter that Italy is having an effect on you that would not otherwise be possible.[2] I myself am already half intoxicated when I merely imagine the sky, the hills, and the buildings of Florence. Enjoy this stay to your heart’s content and then bring a good nose full of it north with you. Your card was written in a classic Italian which truly does the translator proud. I am working terribly hard at present by seeking harmony in my own way. However, when I plug a hole in one place, it promptly reappears in another place every time. Ilse is much better.[3] I am convinced that her entire illness is the result of awful constipation which can be relieved by the glorious American oil. We are still future homeowners, but nothing seems to be happening with that.[4] Paula Marx, with whom I tirelessly played music, was here last week. Albert[5] is coming a week from now for a few days. I have already met twice with Chicherin, who is here at present [6] so I am wavering between Bolshevik and homeowner. Your grandfather[7] is well again, but he will probably never again be as robust as he was. Write sometime and tell me if you already have an impression of the Italian people that’s also an interesting matter for us. Warm regards to you, Maja, and Pauli[8] from your Albert 82. From Paul Ehrenfest Leyden, 30 September 1925 Dear Einstein, Pardon me for writing back so soon however, at this moment it is devilishly dif- ficult for me to find the right path!!— First of all, I thank you very much for the swift response regarding Kramers.[1] — Your response came just in time to come to