The hypnotization of animals shows that only a very low grade intelligence is needed for the production of this state. The famous experiment of Father Kircher with the hen, which any one may repeat at any time, is a good illustration. The fascination exerted upon birds by snakes is another familiar example. The bird is paralyzed with terror at the sight of the snake, and so cannot escape from its enemy, fairly glueing its eyes on the terrifying object, and thus loses power to control its wings. Stories of snake {161} fascination are usually told as if the eye of the snake attracted the bird, who thereupon proceeded to approach the snake. These are, however, doubtful stories. The paralysis of motion seems to be the main effect. The rabbit is affected in nearly the same way. There is a tremor of horror in anticipation, and then the animal stands perfectly quiet, though ordinarily he would be quite able to escape, while its enemy approaches. The underlying mechanism is evidently a concentration of attention, which completely precludes the possibility of the exertion of any spontaneous energy except that involved in the one act of watching the awful object.