the fact that MM. Simon and Binet offered the most dangerous menace to their vapourings ever heard of since the collapse of the Holy Alliance. Their dudgeon followed. In two ways the tests give aid and comfort to their enemies. First, they provide a more or less scientific means of demonstrating the difference in natural intelligence between man and man—a difference noted ages ago by common observation, and held to be real by all men save democrats, at all times and everywhere. Second, they provide a rational scale for measuring it and a rational explanation of it. Intelligence is reduced to levels, and so given a reasonable precision of meaning. An intelligent man is one who is capable of taking in knowledge until the natural limits of the species are reached. A stupid man is one whose progress is arrested at some specific time and place before then. There thus appears in psychology—and the next instant in politics—the concept of the unteachable. Some men can learn almost indefinitely; their capacity goes on increasing until their bodies begin to wear out. Others stop in childhood, even in infancy. They reach, say, the mental age of ten or twelve, and then they develop no more. Physically, they be-
—12—
