There are undoubtedly thousands of feeble-minded persons in correctional institutions. In recent annual reports, of Elmira Reformatory, it has been stated that about 35% of its inmates are mentally defective. The presence of the feeble-minded is a detriment to many plans that have been adopted for the instruction and training of prisoners. The complete exclusion from the ordinary prison of persons afflicted with tuberculosis has improved the healthfulness of those prisons and has also supplied a better and more hopeful means of treatment for the unfortunate sufferers. The same treatment--segregation--should be applied to all those to whom special treatment would be a benefit, or whose ailments are of such a nature as to endanger the welfare of others. Dr. Henry E. Goddard of Vineland estimates that 25% of delinquents are mentally defective. “All mental defectives would be delinquents,” he states, “in the very nature of the case, did not some one exercise some care over them. The mentally defective must be cared for as we care for irresponsibles.” Mr. Ernest K. Coulter, for many years clerk of the Children’s Court of Manhattan and Bronx, New York City, states his belief that the most important step to be taken by the state in its slow abandonment of antiquated methods of dealing with child offenders and victims of bad environment and neglect must be the establishment of institutions for the special treatment of the mental defectives of this class. In the great state of New York, there is no special custodial institution to which the criminal feeble-minded can be committed and transferred. So important is this matter, that it has been made the subject of one of the section meetings of this Committee on Lawbreakers. _Parole._ The principle of parole is a fundamental complement to the principle of the indeterminate sentence. Its successful application requires an efficient merit system within the prison, a competent parole board and adequate supervision of the post-prison parole period, the co-operation of the employment giving public, and the persistent following up, recapture and reimprisonment of wilful violators of parole.