So far, there is no necessary proof of will. Longet found that the eyes and head of a pigeon whose cerebrum had been removed would follow a moving light. We ourselves can sit absorbed in thought or talk, yet follow unconsciously with our eyes the movement of a lantern along a dark road; and if something appears on the outer edge of our vision we often turn quite involuntarily to look. But the baby’s new expression of intelligence and interest showed that whether she willed the movements or not, she attended to the new impressions she was getting. Professor Preyer noticed the same dawn of intelligence in his baby’s face at about the same stage. And it is worth while to observe that when I came to study my record I was surprised to find how often such an awakening look, an access of attention, wonder, or intelligence, in the baby’s face, had coincided with some marked step in development and signalized its great mental importance. I should advise any one who is observing a baby to be on the lookout for this outward and visible sign of an inward and spiritual unfolding. In both these visual developments the baby had proved able to use her neck in coöperation with her eyes, throwing back her head to see farther. It began at the same time to seem that she was really and deliberately trying to hold up her head for the same purpose of seeing better. She not only straightened it up more and more in the bath, but when she was laid against one’s breast she would lift her head from the shoulder, sometimes for twenty seconds at a time, and look about. Preyer sets this down as the first real act of will. The baby’s increased interest in seeing centred especially on the faces about her, at which she gazed with rapt interest. Even during the period of mere staring, faces had oftenest held her eyes, probably because they were oftener brought within the range of her clearest seeing than other light surfaces. The large, light, moving patch of the human face (as Preyer has pointed out) coming and going in the field of vision, and oftener chancing to hover at the point of clearest seeing than any other object, embellished with a play of high lights on cheeks, teeth, and eyes, is calculated to excite the highest degree of attention a baby is capable of at a month old. So from the very first--before the baby has yet really seen his mother--her face and that of his other nearest friends become the most active agents in his development, and the most interesting things in his experience.