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I have always been suspicious of that experiment in which a dog, given food every 30 minutes without any signal, begins to salivate promptly 29 minutes after the previous delivery. I have often wondered what the experimenter did during those 30 minutes. My guess is that he left the room to attend to other matters, perhaps to have a smoke. At 29 minutes by his watch, rather than by any temporal conditioning, I imagine him tiptoeing back and noting with satisfaction that the red fluid in the glass tube shortly thereafter began to move. (p. 650)