[Göttingen, on 6 May 1922]

Dear Professor.†

This is only a birthday greeting, the best part of which of course is that it is brought to you by your Anna, whom you now get back and whom I, alas and how unwillingly, lose. She will tell you something of all the gratitude and sincere good wishes for you with which my heart overflows and which I cannot put into writing. How glad I should be if Anna were to come here in July once again, despite the sad fact that I, whom you entertained so royally in your home, can do so little in return. And even this year's miserly spring had nothing to offer, whereas just at this time the garden should really have been white with blossom; in fact the only blossom was provided by a solitary little apricot tree.

I hope that Anna will find all well at home, including your mother147—without doubt the most important of all people for