Letter from Albert Einstein, Haberlandstrasse 5, Berlin, to Mr [Myer] and Mrs [Esther Polianowsky] Salaman Translation; Dear Mr and Mrs Salaman, I thank you very much for your invitation to your house, which I would have liked to accept. A persistent heart problem prevents me from coming to Cambridge. I regret this very much, especially as Mr Ehrenfest spoke with great warmth of you. With the warmest greetings A. Einstein 10 May 1928