“You will come again, won’t you?” Frederick asked, as the hour of my departure approached. “I have had a bully time talking to the family, and I can do better work now, because they are all happier, and all with me in conscious purpose. It’s true that every bit of conscious co-operation with us helps us, as well as you. So that ‘One for myself and two for the Boy’ is not bunk, Dad. It’s the real thing, for both of us.” With a final brief message to every member of the group, the last of these L—— interviews closed.[10] X The experience at L——, while stimulating, was also fatiguing, and for several days thereafter I was tired and dull, receiving with difficulty the few communications that were attempted. Tuesday evening, April 23d, two of Anne Lowe’s friends wished to talk to her, but were told that she was busy and could not come. Mary K. answered some of their questions, concluding: “Anne sends love to you both, and says please come again soon. She is sorry she can’t come now.” After giving me the twelfth Lesson, Mary K. had said: “That is the last formal lesson. The rest will be given in other ways.” “You mean through interviews and personal messages?” “Not entirely. You will be given signed letters, by great forces.” Afterward, she mentioned these prospective communications sometimes as “letters,” sometimes as “talks,” but Mary Kendal told us, May 13th, that this intention had been temporarily abandoned, as sufficient material for the book had already been given. Evidently this decision had been reached only recently, however, for an attempt to give me the first letter was frustrated on the 25th of April, and a second period of confusion and partial control by invading forces ensued. During the morning, Mary K. prepared me for this letter, in a communication written quickly and easily, as follows: “Men will ask the theory of the letters that are coming to them through you. This must be explained. “As the Lessons have been given to me to deliver to the world through you, so the letters that are to come will be given to me by the forces from whom they come. The reason that they come through me is that I reach you more freely, when you are alone, than any other force known to you and therefore commanding your confidence.... “The Lessons came from great forces combined. They represent unity of all purposes, and were framed by the co-operation and agreement of the greatest forces of each constructive purpose, to reach the consciousness of men in general terms of your plane. “The reason that these forces do not come to you personally is that not all of them can reach you as freely as I do. Your simile of wireless telegraphy is a good one. It does not fully explain the connection between you and me, but is as good an explanation as the progress of physical science enables you on that plane to follow. The full explanation will inevitably be possible, as physical scientists are already beginning to work toward it.