I cannot hope for a sane explanation of such things. But a sane explanation for my experience seems even less probable. I am impressed by your rat who levitates crumbs of cheese. But I am appalled; I am horrified; I am stupefied by what I did! You asked me to wait for you in a certain laboratory beyond a door. I entered. I saw a small, fat, mangy she-dog in a dog-run. She looked at me and wagged her tail. I thereupon went to the other end of the laboratory, opened a box, and took out a handful of strange objects you later told me are sweetmeats to a dog. I gave them to the animal. Why did I do it? How was it that I went directly to a box of which I knew nothing, opened it as a matter of course, and took out objects I did not even recognize, to give them to that unpleasant small beast? How did I know where to go? Why did I go? Why should I give those then-meaningless objects to the dog? It is as if I were enchanted! You say that it is a psi phenomenon. The rat causes small objects to move. The dog, you say, causes persons to give it canine candy. I revolt against the conclusion, which I cannot reason away. If you are right, we are at the mercy of our domestic animals! Dog-lovers are not people who love dogs, but people who are enslaved by dogs. Cat-lovers are merely people who have been seized upon by cats to support and pet and cater to them. This is intolerable! I shall fear all pets from now on! I throw myself back into my own work to avoid thinking of it. I-- * * * Later. I did not mail this letter because an appalling idea occurred to me. This could bear upon my investigation! Do you think The Leader--No! It could not be! It would be madness.... * * * * * Extract from a letter from Dr. Karl Thurn to Professor Albrecht Aigen. ... I deplore your reaction. It has the emotional quality of a reaction to witchcraft or magic, but psi is not witchcraft. It is a natural force. No natural force is either nonexistent or irresistible. No natural force is invariably effective. Psi is not irresistible under all circumstances. It is not always effective. My rat cannot levitate cheese-crumbs weighing more than 1.7 grams. My she-dog could not make you give her dog-candy once you were on guard. When you went again into the laboratory she looked at you and wagged her tail as before. You say that you thought of the box and of opening it, but you did not. It was not even an effort of will to refrain.