Let us now consider somewhat more carefully the way in which ideas of people grow up in the mind, and try to make out, as nearly as we can, their real nature and significance. The studies through which the child learns, in time, to interpret personal expression are very early begun. On her twelfth day M. was observed to get her eyes upon her mother’s face; and after gazing for some time at it she seemed attracted to the eyes, into which she looked quite steadily. From the end of the first month this face study was very frequent and long-continued. Doubtless anyone who notices infants could multiply indefinitely observations like the following: “M., in her eighth week, lies in her mother’s lap gazing up at her face with a frown of fixed and anxious attention. Evidently the play of the eyes and lips, the flashing of the teeth, and the wrinkles of expression are the object of her earnest study. So also the coaxing noises which are made to please her.” “She now [four months and twenty-one days old] seems to fix her attention almost entirely upon the eyes, and will stare at them for a minute or more with the most intent expression.” The eye seems to receive most notice. As Perez says: “The eye is one of the most interesting and attractive of objects; the vivacity of the pupil set in its oval background of white, its sparkles, its darts of light, its tender looks, its liquid depths, attract and fascinate a young child....”[18] The mouth also gets much attention, especially when in movement; I have sometimes noticed a child who is looking into the eyes turn from them to the mouth when the person commences to talk: the flashing of the teeth then adds to its interest. The voice is also the object of close observation. The intentness with which a child listens to it, the quickness with which he learns to distinguish different voices and different inflections of the same voice, and the fact that vocal imitation precedes other sorts, all show this. It cannot fail to strike the observer that observation of these traits is not merely casual, but a strenuous study, often accompanied by a frown of earnest attention. The mind is evidently aroused, something important is going on, something conscious, voluntary, eager. It would seem likely that this something is the storing up, arrangement, and interpretation of those images of expression which remain throughout life the starting-point of personal imaginations.