All these sounds were used often enough at other times, and other sounds were used in their special places; yet week by week the notebook showed “Dă!” growing into the regular expression of discovering, pointing out, admiring, exulting; “Nă-nă-nă!” into that of refusal and protest; and “Mă-mă-mă,” which soon became “Mom-mom-mom,” into that of a special sort of wanting, which slowly gathered itself about the mother in particular. I do not think that these were echoes of our words “There!” and “No!” and “Mamma;” it was only slowly, and after the baby was a year old, that they came into unison with these words--and in the case of “Mamma,” not without some teaching. It is more likely that we have here a natural cry of pointing out, a natural negative, a natural expression of baby need and dependence, which give us a hint of the origin of our own words. The fourth sound, however, which developed through many variations (such as “M-gâ,” “Gâ,” or “Gng”) to a clear “Gông,” “A-gông,” and even “Gone,” was plainly an echo. It was used as loosely as it was pronounced: the baby murmured “Ng-gng!” pensively when some one left the room; when she dropped something; when she looked for something she could not find; when she had swallowed a mouthful of food; when she heard a door close. She wounded her father’s feelings by commenting “M-gâ!” as her little hands wandered about the unoccupied top of his head. She remarked “Gông!” when she slipped back in trying to climb a step; when she failed to loosen a cord she wished to play with; when she saw a portière, such as she was used to hide behind; when she was refused a bottle she had begged for. It meant disappearance, absence, failure, denial, and any object associated with these. In just this fashion, Preyer’s boy used his first word of human speech, at about this age. “Atta!” the little fellow would murmur when some one left the room, or when the light went out--using a favorite old babble of his own, just as our baby did, to help him get hold of a grown-up word, “Adieu” or “Ta-ta,” which carried the meaning he was after. The idea of _disappearance_--of the thing now seen, now gone--seems to take strong hold on babies very early; I have known several other cases.