Clear seeing, let us here recall, is not done with the whole retina, but only with a tiny spot in the centre, the so-called “yellow spot,” or “macula lutea.” If the image of an object falls to one side of this, especially if it is far to one side, we get only a shapeless impression that something is there; we “catch a glimpse of it,” as we say. In order really to look at it we turn our eyeballs toward the object till the image falls on the spot of clear vision. We estimate the distance through which to turn the balls, down to minute fractions of an inch, by the feeling in the eye muscles. This was what the baby had done, and I do not dare to say how many philosophical and psychological discussions are involved in her doing it. Professor Le Conte thinks that it shows an inborn sense of direction, since the eyes are turned, not toward the side on which the ray strikes the retina, but toward the side from which the ray enters the eye; that is, the baby thinks out along the line of the ray to the object it comes from, thus putting the object outside himself, in space, as we do. Professor Wundt, the great German psychologist, is positive that the baby has no sense of space or direction, but gains it by just such measurements with the eye muscles; that there is no right nor left, up nor down, for him, but only associations between the look of things off at one side, and the feel of the eye action that brings them to central vision. This means that before a baby can carry the eye always through just the right arc to look at an object, he must have made this association between the look of things and the feel of the action separately for each point of the retina. It is a great deal for a baby to have learned in three weeks; still, babies have to learn fast if they are ever to catch up with the race; and in the early roamings of the eye they experience over and over all manner of transits of images to and fro across the retina. Probably, too, it was still only partially learned. I watched now for what Preyer’s record had led me to expect as the next development in vision--the ability to follow a moving object with the eyes; that is, to hold the yellow spot fixed on the object as it moved, moving the eyeball in time with it in order to do so. I used my hand to move to and fro before the baby, and could not satisfy myself that she followed it, though she sometimes seemed to; but the day after she was a month old I tried a candle, and her eyes followed it unmistakably; she even threw her head back to follow it farther. In trying this experiment, one should always use a bright object, should make sure the baby’s eyes are fixed on it, and then should move it very slowly indeed, right and left.