2. Institutions which care for the same type of delinquents show pronounced variation in the amount of tested deficiency. Compare the Indiana Boys' School with the Michigan Industrial School for Boys. Thirty per cent. tested presumably deficient in the former as against 6% in the latter; or 48% in the former and 21% in the latter tested below our borderline for the presumably passable intellects. This difference can hardly be explained by errors in testing. It marks a significant difference between the care of the mentally deficient in the two states. The difference in the success of states in isolating their feeble-minded is best shown by comparing the Newark and Pittsburgh institutions for boys from the juvenile courts on the one hand, and the local groups of boy delinquents from Hennepin County, Minn., and Cook County, Ill., on the other. In one case over 60% and in the other less than 10% were below the same borderline. In other words, the courts in Newark and Pittsburgh were deliberately sending mental deficients to their local institutions for delinquents because there was no better place available, not because they mistook deficiency for delinquency. The better diagnosis of deficiency by test criteria is, however, the first step in demonstrating this situation so that public sentiment for an adequate state care for the feeble-minded may be in accord with a conservative statement of the present conditions. Moreover, we have made real progress when we have demonstrated objectively that the difference in the character of the inmates of corresponding institutions is not a mere matter of opinion.