About a third of the cases showed fair or good mentality. These cases have been studied in detail for evidence of other mental and nervous defects aside from mental deficiency. The results will be given later. Over half of the cases studied were found to be defective mentally. This corresponds to the results of the investigation of the White Slave Commission[2] made recently in Massachusetts, in which 51 per cent. of 300 cases studied mentally were found to be defective and represented segregable types. We should consider at least one quarter of our own cases segregable from a standpoint of mental defect alone, and besides these perhaps, another 20 per cent., candidates for a defective delinquent institution, if such a classification should include those cases which show marked psychopathic tendencies associated with subnormal mentality. The cases which are considered segregable types appear to be unable to care for themselves in the community. Besides the harm that may be done to them on account of their weakened resistance they become an active menace to others; first, through the spread of venereal disease; second, through their immoral influence in the community; and third, through bringing into the world children who will grow up to be as much a menace to society as they themselves have been. It should be the responsibility of representative members of society to see that provision is made for the care of such individuals, and that they are not punished for offences for which they can in no way be considered responsible. Besides the cases showing mental defect alone, there are many cases both among the mentally defective and those showing normal mentality, which show other mental or nervous defects, such as epilepsy, hysteria and psychopathic tendencies. In the study of criminality of all kinds, such abnormal mental and nervous conditions play an important part. This is especially true of the class of women which is arrested on account of sex offences. In the environment of mill towns and certain sections of large cities, from which a large part of this population comes, the temptations which appeal to sex are tremendous, even to the individual who has a normal mentality and is well balanced. If through such conditions as slight mental dullness or extreme nervousness, the equilibrium is disturbed, the power of resistance is lost and the individual is unable to cope with the temptations which are usually about her.