We have heard much in recent years of the particular danger of allowing the better grade of feeble-minded, especially the morons, to be abroad in the community. Time and again it is asserted that it is this class of deficients which is most likely to become delinquent. There is a widespread confusion here between the statement that criminals in absolute numbers are drawn more frequently from the moron class and the statement that morons are relatively more likely than imbeciles or idiots to become delinquent. To the first alternative there would be no objection since morons are much more frequent than the lower grades of deficiency. On the other hand if morons are relatively more likely to be delinquent than imbeciles, then we should expect those just above the morons in ability to be more likely than morons to be delinquent. The technical answer to the problem whether the lower grades of deficiency are more likely to become delinquent could be best reached by discovering the correlation of delinquency with the different grades of deficiency. Goring's data throw some light on this question since he has found the correlation between grades of intelligence and the degree of recidivism and also between intelligence and the frequency of bad reports in the penal institutions where the convicts were held. In both cases the tendency is clear for the weak-minded and imbecile to be more frequently convicted and to be reported more frequently for bad conduct than for the higher grades of intelligence which he classifies as unintelligent, fairly intelligent and intelligent. The correlation coefficient with frequency of convictions relative to time out of prison is -.16 and with frequency of bad reports is -.33. The correlation ratios are slightly higher in both cases. On the other hand the more intelligent are likely to be given longer sentences, the correlation being +.10.[33] It might be contended that his distinction between the lowest grades of intelligence is not objective and not very clear; but that the general tendency of the regression lines would be reversed at the lower extreme seems very improbable. In other words there is some reason to suppose that, relative to their numbers, the idiots and imbeciles would be more likely to be delinquent than the more intelligent feeble-minded provided none was confined in an institution. No idiot and few, if any, imbeciles could survive honestly in any environment without assistance.