ABSTRACT
This chapter deals with three groups of tests; the two first concerned with mental activity of a special nature, the last with determination of general intelligence. Thought in childhood has often been subject to investigation by means of tests. The aim of the children's tests is to determine when the abstract relation of likeness is mentally grasped and in what form this idea of likeness develops. Hans Volkelt will doubtless be right in saying that the children when they consider the simple mental impression and are quite at a loss as to its import see in representations of the same colour portions of a coloured whole and therefore point out these two parts of the combined whole as belonging together. By intelligence modern psychology understands that general capacity by which a human being can successfully meet fresh demands of life through the help of mental effort.
