Looked at as a matter wherein the welfare of society is the chief concern, one most difficult point in the problem of mental defect grows more readily soluble. I speak of those cases in which evidence of feeblemindedness, although distinct, especially if studied by means of tests, is minor in degree as compared with the ethical defect present. These form a class of offenders most difficult to deal with because so frequently, on account of good development of language ability, they pass in the world in general, and in courts in particular, as practically normal individuals. This type has been designated by various terms. Anton has recently published a symposium monograph on the subject showing that the consensus of opinion is that there certainly exists a distinct group in which moral defect is out of proportion to the amount of mental subnormality. The recent report of the Massachusetts commission on the increase of criminals emphasizes this very point. To those who doubt the existence of mental defect in such cases I commend the use of psychological tests. Better study of the individual will, in any case, give some indication of that most important point for the welfare of society, namely, whether or not the crime will be repeated. Turning in the interests of society to the study of the individual offender, especially the recidivist, we shall at once be led by practical considerations into an attempt to decipher the causative factors of his career. The great value of such intelligent study can be shown in many types of cases, but nowhere is it more evident than when the offenders are mentally defective. The recent work of Miss Moore for the Public Education Association of New York shows the after-records of some children formerly in the subnormal rooms in the New York public schools and also of some of the feebleminded men who were paroled from the Elmira Reformatory to New York. The financial and moral cost to the community has been very great from such sources. We ourselves have many such records, showing the terrible burden a criminalistic defective is to the community. Dozens of times, indeed up to a hundred times in the police stations, is the record of even some of the younger members of this group, as we have observed them.