In the _thirtieth month_ the independent activity of thought develops more and more. When the child is playing by himself, e. g., he often says to himself: _Eimerchen ausleeren_ (make pail empty); _Hackemesser_ (chopping-knife). Thus his small vocabulary serves him at any rate for making clear his own ideas. Already his thinking is often a low speaking, yet only in part. When language fails him, he first considers well. An example: The child finds it very difficult to turn crosswise or lengthwise one of the nine-pins which he wants to put into its box, and when I say, "Round the other way!" he turns it around in such a way that it comes to lie as it did at the beginning, wrongly. He also pushes the broad side of the cover against the small end of the box. The child evidently understands the expression "Round the other way"; but as the expression is ambiguous (the head of the nine-pin may go to the left, to the right, up, down, back, forward), we can understand that the pin should be turned now one way and again another way, and even brought back to its original position. Then appears the child's own deliberation without words--without any speaking at all, low or loud--until after frequently repeated packing and unpacking hardly any hesitation is shown. Many utterances show how easily at this period objects that have only a slight resemblance to one another or only a few qualities in common are included in one concept. When a roasted apple is peeled, the child sees the peel and says (thinking of his boiled milk, which he saw several hours previous, but which is not now present), _Milch auch Haut_ (milk skin too). Similar is the expression _Kirche laeutet_ (church rings) when the tower-clock strikes. The child forms concepts which comprehend a few qualities in unity, and indeed without designating the concept always by a particular word, whereas the developed understanding more and more forms concepts with many qualities and designates them by words. Hence the concepts of the child have less content and more extent than those of adults. For this reason they are less distinct also, and are often ephemeral, since they break up into narrower, more distinct concepts; but they always testify to activity of thought.