ENDS AND MEANS A's intelligence quotient is higher than B's tells us, as it stands, very little; if it is to be really significant, we must know a number of "other facts—whether, for example, A and B belong to the same psycho-physical type or to different types, whether they approximate to the pure type or are greatly mixed. And so on. The intelligence test, then, is an imperfect instrument; but, imperfect as it is, it has done something to give statistical form and content to the universally held conviction that some people are stupider than others. Having accepted the fact that human beings belong to different types, are gifted with different talents and have different degrees of intelligence, we must attempt to give each the education best calculated to develop his or her capacities to their utmost. In a rather crude and inefficient way, this is what we are attempting to do even now. Clever boys pass examinations and are given scholarships that take them from primary to secondary schools and from secondary schools to universities. Handy boys are apprenticed or sent to technical schools to learn some skilled trade. And so on. A rough and ready , system—a good deal rougher than readier. Its defects are twofold. First, the methods employed for choosing the candidates for the different kinds of education are far from satisfactory. And, second, the kinds of education to which successful candidates are subjected are even less satisfactory than the methods of choice. About the examination system it is unnecessary for me to speak at length. Most educators agree in theory that a single crucial examination does not provide the best test of a person's ability. Many of them have even passed from theory to practice and are giving up the single, crucial examination in favour of a series of periodical tests of knowledge and intelligence and the reports, over a span of years, of teachers and inspectors. Supplemented by an expert grading in terms of psycho-physical type, the second 194