February 12, 1951

Dear Solovine,

In the German text I wrote “limited” in the sense of “not too common.”

The editorial mix-up is unfortunate, for Flammarion is in possession of a contract which I negligently let slip through (my friend and collaborator Infeld is looking into it now); the extent to which Flammarion is entitled to publication rights is still in doubt. I hope that you have been paid for the translation, which was marked by so many difficulties. If so, publication matters little to me, to be truthful. Let the publishers arrange matters between themselves.

My sister’s affliction has naturally become increasingly severe in the interval, but she does not suffer from it directly. I myself can not complain of my health, although the effects of old age are making themselves felt. I do not come from a long-lived family, as you know.

The unified field theory has been brought to a conclusion. But it is hard to use it mathematically for, in spite of all the trouble I have gone to, I am not able to verify it in any way. This state of affairs will last for many more years, mainly because physicists have no understanding of logical and philosophical arguments.

Cordial regards,
Your         

A. Einstein