In a ground floor room which I used as my study, I hung an old sheet, which reached to the ground, on a long spear inserted in a heavy wooden disk; I surmounted it with a ragged hunting cap, and so arranged the sheet as to give it some resemblance to the human form. When my dog came in as usual, he looked suspiciously at the object, snuffing about and gradually approaching to walk round and observe it. At last he was satisfied, and curled himself up by the skirts of the bogey, where I had placed the mat on which he was accustomed to lie when he was with me. One evening when the moon shone doubtfully and there was just light enough to distinguish the outline of things, I carried the shapeless bogey into the garden near my room, and placed it among some shrubs and bushes. I went back to the house and called my dog, who followed me quietly until he reached the spot from which he could see the bogey distinctly enough for him to recognize its identity with the one with which he was already familiar. As soon as he saw the apparition he stood still, growling furiously; he began to bark, and when I encouraged him to come on, he turned round and ran back to the house. I shut up the dog in another room, brought back the bogey to its former place, and threw a strong light upon it before recalling the dog. At the first sight of the bogey the dog paused suspiciously for an instant, but when I sat down to the table as usual, he hesitated a little and after snuffing at it went back to his couch. I have made similar experiments with dogs, rabbits, birds, and other animals. I took long wooden poles, and put them inside their cages or hutches in such a way that the animals got to know and feel reconciled to the sight of them. After some days had elapsed, I contrived, while screened from sight, to take the poles from their usual place and to make them touch and annoy the animals with more or less violence, thus causing them to flutter or scamper about and to shrink away, as if from the touch of a living person, although they were unable, as I have said, to see me or my hand. Those which were least agitated sprang forward with little leaps and looked about them, doubtful and excited. I might go on to describe many other experiments made with the same object, and always with the same result, but these are enough to show that I went to work cautiously and conscientiously, that the spontaneous and innate personification of the objects perceived by animals is clearly apparent, and also how we may account for their indifference to those to which they become accustomed.