An investigation of one hundred of the Juvenile Court children in the Detention Home of the City of Newark showed that 67 per cent of them were distinctly feeble-minded. From this estimate are excluded children who are yet too young for us to know definitely whether the case is one of arrested development. This point once determined would unquestionably swell the percentage of defect. An examination of fifty-six girls from a Massachusetts reformatory, but out on probation, showed that fifty-two of them were distinctly feeble-minded. This was partially a selected group, the basis being their troublesomeness; they were girls who could not be made to stay in the homes that were found for them, nor to do reasonable and sensible things in those homes, which fact, of itself, pointed toward feeble-mindedness. The foregoing are figures based on actual test examinations as to mental capacity. If we accept the estimates of the mental condition of the inmates made by the superintendents of reformatories and penal institutions, we get sometimes a vastly higher percentage; _e.g._ the Superintendent of the Elmira Reformatory estimates that at least 40 per cent of his inmates are mental defectives. Indeed, it would not be surprising if careful examination of the inmates of these institutions should show that even 50 per cent of them are distinctly feeble-minded. In regard to prostitutes, we have no reliable figures. The groups of delinquent girls to which we have already referred included among the numbers several that were already known as prostitutes. A simple observation of persons who are leading this sort of life will satisfy any one who is familiar with feeble-mindedness that a large percentage of them actually are defective mentally. So we have, as is claimed, partly from statistical studies and partly from careful observation, abundant evidence of the truth of our claim that criminality is often made out of feeble-mindedness. Mr. Winship in his comparison of the Jukes and Edwards families has strengthened our claim in this respect. In all environments and under all conditions, he shows the latter family blossoming out into distinguished citizens, not primarily through anything from without but through the imperious force within. Since we may conclude that none of the Edwards family, who are described by Dr. Winship, were feeble-minded, therefore none of them became criminals or prostitutes. But here again his argument is inconclusive because he does not tell us of all the descendants. With equal safety it may be surmised that many of the Jukes family (perhaps the original stock, indeed) were feeble-minded and therefore easily lapsed into the kind of lives that they are said to have lived.