Read it through once

Yes, as I was saying, I had waited five or six weeks; then I wrote but three lines, because I felt and seemed to know that a letter from Millet would cross mine. And so it did. He wrote the same day that I wrote. The letters crossed each other. His letter went to Berlin, care of the American minister, who sent it to me. In this letter Millet said he had been trying for six weeks to stumble upon somebody who knew my German address, and at last the idea had occurred to him that a letter sent to the care of the embassy at Berlin might possibly find me.