There was a decided advance, too, in her acquaintance with her own body. Sitting as usual in her horse-collar, she was bending herself back over it, a thing that she had done before; but to-day she kept it up so persistently, and bent herself back with such exertion, that at last the back of her head touched the floor. She righted herself with an expression of great surprise. Evidently she had been experimenting in new muscular sensations only, and (as happens to all experimenters sometimes) had got an extra result that she did not bargain for and did not understand. She bent back again, with her head screwed around to see what had given her the touch. In this position, she did not reach the floor. She sat up again, looked at me with a perplexed face, and tried it over, a full dozen times, till her mother picked her up to stop it, on the ground that the baby was more valuable than the experiment, and that she would break her little back. For days, however, the baby returned to the investigation, doubling herself back over the arm of any one who held her till her head hung straight down, or over the horse-collar till it rested on the floor. We may perhaps fairly guess that in this incident she had for the first time discovered the back of her head as a part of herself, and any of us might well be surprised to find himself extending off behind into space that way, if he had never known about it before. The baby had of course felt daily and hourly touches on the back of her head, from pillow and floor and lap, from cap and hair brush; but all her previous behavior, and her surprise now, indicate that this was the first time she had externalized these touches--which implies also the first time she had felt _herself_ as receiving them. One of the first things she did when she began grasping zealously was to seize her own toes, and she bent her foot forward on the ankle to bring it better in reach. This may have been a purely instinctive coöperating act at first, but it helped on the control of feet and legs, and the recognition of them as parts of herself--the more as they were now for some time favorite playthings every time the baby was undressed. Another significant movement the next day, also brought about by the advance in grasping, was the first attempt to scramble forward as she lay on her stomach, to get hold of something--a futile effort, but the forerunner of creeping.