It is true that after long experience animals become accustomed to regard as harmless the phenomena, objects, and forces by which they were at first sympathetically excited and terrified. Of this we have innumerable examples both among wild and domestic animals; but although suspicion and anxiety are subdued by habit and experience, yet these objects and phenomena are not thereby transformed into pure and simple realities. In the same way, if they are at first frightened by the sight and companionship of some other species or object, habit and experience gradually calm their fears and suspicions, and the association or neighbourhood may even become agreeable to them. I have often observed that different species, both when at liberty and in confinement, are affected by the most lively surprise and perturbation when some new phenomenon has startled them; they act as if it were really a living and insidious subject, and then they gradually become calm and quiet, and regard it as some indifferent or beneficent power. I must adduce some observations and experiments from the many I have made on this subject. It may be objected that if animals in their spontaneous perception personify the object in question, they would give signs of this fact with respect to all the objects with which they come in contact, and among which they live, and yet they remain indifferent to many of them, which is a proof that they distinguish the animate from the inanimate. In fact it cannot be disputed that a vast number of the phenomena and objects of nature are regarded by animals with indifference; they are perceived by them, but it does not appear that they suppose these things to be endowed with life. It is, however, necessary in the first place to distinguish two modes and stages in this animation of things, one of which we may term static, and the other dynamic. In the first instance, the sentient subject remains tranquil at the very moment when he vivifies the phenomenon or the thing perceived; while the act is accomplished with so much animating force, and with an implicit and fugitive consciousness, it exerts no immediate and sudden influence on the perceiving animal, and consequently he gives no external signs of the personifying character of his perception. In the second instance, which we have termed dynamic, that is, when the phenomenon or object has a direct and sudden effect on the animal himself, he expresses by his movements; gestures, cries, and other signs, how instantaneously he considers and feels the object in question to be alive, for he behaves in exactly the same way towards real animals.