until almost every possible application of the contrary theory had been made with disastrous result, now (in the industrial department) prevails universally in the most advanced countries, almost universally in all that have pretensions to any sort of advancement. It is not that all processes are supposed to be equally good, or all persons to be equally qualified for everything; but that freedom of individual choice is now known to be the only thing which procures the adoption of the best processes, and throws each operation into the hands of those who are best qualified for it. Nobody thinks it necessary to make a law that only a strong-armed man shall be a blacksmith. Freedom and competition suffice to make blacksmiths strong-armed men, because the weak-armed can earn more by engaging in occupations for which they are more fit. In consonance with this doctrine, it is felt to be an overstepping of the proper bounds of authority to fix beforehand, on some general presumption, that certain persons are not fit to do certain things. It is now thoroughly known and admitted that if some such presumptions exist, no such presumption is infallible. Even if it be well grounded in a majority of cases, which it is very likely not to be, there will be a minority of exceptional cases in which it does not hold: and in those it is both an injustice to the individuals, and a detriment to society, to place barriers in the way of their using their faculties for their own benefit and for that of others. In the cases, on the other hand, in which the unfitness is real, the ordinary motives of human conduct will on the whole suffice to prevent the incompetent person from making, or from persisting in, the attempt.