had thus become aware of X—aware, that is, that there was such a thing as X and of its significance.” Since Frankfurter knew Bohr’s field he assumed X was the reason for Bohr’s visit: And so . . . I made a very oblique reference to X so that if I was right in my assumption that Professor Bohr was sharing in it, he would know that I knew something about it. . . . He likewise replied in an innocent remote way, but it soon became clear to both of us that two such persons, who had been so long and so deeply preoccupied with the menace of Hitlerism and who were so deeply engaged in the common
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