It is then this preference for one particular kind of mental imagery, and that the motor, or muscular kind, which gives this type of child his peculiarity in this more psychological period. When we pass from the mere outward and organic description of his peculiarities, attempted above in the case of very young children, and aim to ascertain the mental peculiarity which accompanies it and carries on the type through the individual's maturer years, we see our way to its meaning. The fact is that a peculiar kind of mental imagery tends to swell up in consciousness and monopolize the theatre of thought. This is only another way of saying that the attention is more or less educated in the direction represented by this sort of imagery. Every time a movement is thought of, in preference to a sound or a sight which is also available, the habit of giving the attention to the muscular equivalents of things becomes more firmly fixed. This continues until the motor habit of attention becomes the only easy and normal way of attending; and then the person is fixed in his type for one, many, or all of his activities of thinking and action. So now it is no longer difficult to see, I trust, why it is that the child or youth of this sort has the characteristics which he has. It is a familiar principle that attention to the thought of a movement tends to start that very movement. I defy any of my readers to think hard and long of winking the left eye and not have an almost irresistible impulse to wink that eye. There is no better way to make it difficult for a child to sit still than to tell him to sit still; for your words fill up his attention, as I had occasion to say above, with the thought of movements, and these thoughts bring on the movements, despite the best intentions of the child in the way of obedience. Watch an audience of little children--and children of an older growth will also do--when an excited speaker harangues them with many gestures, and see the comical reproduction of the gestures by the children's hands. They picture the movements, the attention is fixed on them, and appropriate actions follow. It is only the generalizing of these phenomena that we find realized in the boy or girl of the motor type. Such a child is constantly thinking of things by their movement equivalents. Muscular sensations throng up in consciousness at every possible signal and by every train of association; so it is not at all surprising that all informations, instructions, warnings, reproofs, suggestions, pass right through such a child's consciousness and express themselves by the channels of movement. Hence the impulsive, restless, domineering, unmeditative character of the child. We may now endeavour to describe a little more closely his higher mental traits.