When the child lies on his back, he moves his arms and legs in a lively manner even without any external provocation. He contracts and expands all the muscles he can command, among these especially the muscles of the larynx, of the tongue, and of the aperture of the mouth. In the various movements of the tongue made at random it often happens that the mouth is partly or entirely closed. Then the current of air that issues forth in breathing bursts the barrier and thus arise many sounds, among them some that do not exist in the German language, e. g., frequently and distinctly, by means of labio-lingual stoppage, a consonant-sound between _p_ and _t_ or between _b_ and _d_, in the production of which the child takes pleasure, as he does also in the labial _brr_ and _m_. By far the greater part of the consonant-sounds produced by the exercises of the tongue and lips can not be represented in print; just as the more prolonged and more manifold movements of the extremities, movements made by the child when he has eaten his fill, and is not sleepy and is left to himself, can not be drawn or described. It is noteworthy that all the utterances of sound are expiratory. I have not once observed an attempt to form sounds while drawing in the breath. In the seventh month the child at one time screamed piercingly, in very high tones, from pain. When hungry and desiring milk, he said with perfect distinctness, _mae_, _ae_, _[)u]ae_, _[)u]ae[)e]_; when contented he would say _oerroe_ too, as at an earlier period. The screaming was sometimes kept up with great vigor until the child began to be hoarse, in case his desire, e. g., to leave his bed, was not granted. When the child screams with hunger, he draws the tongue back, shortens it and thereby broadens it, making loud expirations with longer or shorter intervals. In pain, on the other hand, the screaming is uninterrupted and the tones are higher than in any other screaming. During the screaming I heard the rare _l_ distinctly in the syllable _lae_. The vowels _[)u]-[=a]-[)u]-i-i_ also appeared distinctly, all as if coming by accident, and not often pure. The _t_ also was seldom heard; _f_, _s_, _sch_, _st_, _sp_, _sm_, _ts_, _ks_, _w_, not once yet; on the other hand, _b_, _d_, _m_, _n_, _r_, often; _g_, _h_, more seldom; _k_, only in yawning; _p_, but very rarely, both in screaming and in the child's babble to himself or in response to friendly address.