The question where to isolate the deficient delinquent, whom Kuhlmann says is “equally well placed or misplaced in the institution for the feeble-minded and the reformatory,” (_140_) is answered in substance by Supt. Murdoch of the State Institution for the Feeble-Minded in Western Pennsylvania. He suggests that in large states the deficient delinquents might be cared for in an institution which should bear the same relation to the state institutions for the feeble-minded and the penal institutions as is now held by the asylums for the criminal insane. Where a separate institution is not possible the affiliation with the institutions for either the delinquents or the deficients may be tried by means of colonies especially set apart in them. In Massachusetts these divisions for the deficient delinquent are connected with the institutions for delinquents. 5. Turning to external influences upon delinquency, we find that their effect has been measured mainly in connection with the tendency to repeat criminal acts. It has been shown by Goring that even such important influences as the example of criminality in the home, kind and amount of schooling, irregularity of employment, alcoholism, size of family, low standard of living, early death of mother, etc., have generally been found not to increase notably the tendency to recidivism while they do correlate decidedly with deficiency. Nevertheless, it has not been determined whether these external factors may not have an important influence upon the first manifestation of the criminal diathesis even though they tend only slightly to increase recidivism. Should these external influences prove to be not more than a fifth as important as deficiency and heredity, which now seems to be indicated, we need to hunt for other outer influences which may really prove to be more important.