After this her progress in holding up her head was suddenly rapid, and by the end of the month, four days later, she could balance it for many minutes, with a little wobbling. This uncertainty soon disappeared, and the erect position of the head was accomplished for life. During these last days of the month the baby was possessed by the most insatiate impulse to be up where she could see. It was hard to think that her fretting and even wailing when forced to lie down could mean only a formless discontent, and not a clear idea of what she wanted. Still, it is not uncommon, when an instinct is thwarted, to feel a dim distress that makes us perfectly wretched without knowing why. As soon as she was held erect, or propped up sitting amid cushions, she was content; but the first time that she was allowed to be up thus most of the day, she slept afterward nine unbroken hours, recuperating, probably, quite as much from the looking and the taking in that the little brain and eyes had been doing as from any muscular fatigue there may have been in the position. Such is the “mere life of vegetation” the baby lived during the first two months. No grown person ever experiences such an expansion of life, such a progress from power to power in that length of time. Nor was our little girl’s development anything unusual for a healthy, well-conditioned child, so far as other records give material for comparison. Preyer’s boy was later than she in getting his head balanced, but he arrived at full accommodation (and that is the most important work of the first two months) at almost exactly the same age as she; and so did Mrs. Hall’s boy. I do not know of any other records that make a clear statement on this point. VI PROGRESS TOWARD GRASPING. The baby’s development, as I have said, consisted now mainly in forming association groups in her mind in two series, which we might call a sight-motor series and a touch-motor series. There had been a leap forward in the sight-motor series when “accommodation” was learned. Now the touch-motor series came to the front, and step by step led on to the great accomplishment of grasping. First, when we laid the baby’s face up against ours, her little tongue was put out to lick the cheek that she felt, warm and smooth, against her lips. This was a more advanced use of active feeling than the mere passing of her tongue over her own lips, for that must have been done accidentally many times before she began to do it on purpose; and the association between the movement and the feeling had been helped by the double sensation--one feeling in the lips and another in the tongue every time they touched.