It is probable that the disappearance of a thing is at a very early stage a puzzle to the infant. Later on, too, the young mind continues to be exercised about this mystery. Our little friend’s inquiry about the whither of the big receding sea, “Where does the sea sim (swim) to?” illustrates this perplexity. A child seems able to understand the shifting of an object of moderate size from one part of space to another, but his conception of space is probably not large enough to permit him to realise how a big tract of water can pass out of the visible scene into the unseen. The child’s question, “Where does all the wind go to?” seems to have sprung from a like inability to picture a vast unseen realm of space. In addition to this difficulty of the disappearance of big things, there seems to be something in the vastness, and the infinite number of existent things perceived and heard about, which puzzles and oppresses the young mind. The inability to take in all the new facts leads to a kind of resentment of their multitude. “Mother,” asked a boy of four years, “why _is_ there such a lot of things in the world if no one knows all these things?” One cannot be quite sure of the underlying thought here. The child may have meant merely to protest against the production of so confusing a number of objects in the world. This certainly seems to be the motive in some children’s inquiries, as when a little girl, aged three years seven months, said: ‘Mamma, why do there be any more days, why do there? and why don’t we leave off eating and drinking?’ Here the burdensomeness of mere multiplicity, of the unending procession of days and meals, seems to be the motive. Yet it is possible that the question about a lot of things not known to anybody was prompted by a deeper difficulty, a dim presentiment of Berkeley’s idealism, that things can exist only as objects of knowledge. This surmise may seem far-fetched to some, yet I have found what seem to me other traces of this tendency in children. A girl of six and a half years was talking to her father about the making of the world. He pointed out to her the difficulty of creating things out of nothing, showing her that when we made things we simply fashioned materials anew. She pondered and then said: “Perhaps the world’s a fancy”. Here again one cannot be quite sure of the child-thought behind the words. Yet it certainly looks like a falling back for a moment into the dreamy mood of the idealist, that mood in which we seem to see the solid fabric of things dissolve into a shadowy phantasmagoria.