Thus we see that malingering has its _raison d'être_; that, after all, it is not at all strange that the suspicion of its existence should be so frequently raised by our legal brethren--yes, and medical brethren, too; that in reality it ought to be a very common manifestation. Nevertheless, paradoxical though it may seem, cases of pure malingering of mental disease are comparatively rare in actual practice. Wilmanns,[5] in a report of 277 cases of mental disease in prisoners, cites only two cases of pure malingering, and in a later revision of the diagnoses of the same series of cases the two cases of malingering do not appear at all. Bonhoeffer,[6] in a study of 221 cases, found only 0.5 per cent of malingering. Knecht,[7] in an experience of seven and a half years at the Waldheim Prison, did not observe a single case of true malingering. Vingtrinier[8] claims not to have found a single case of true malingering among the 43,000 delinquents observed by him during his experience at Rouen. Connolly, Ball, Krafft-Ebing, Jessen, Siemens, Mittenzweig, and Scheule are quoted by Penta as having expressed themselves that pure malingering is extremely rare. Penta, on the contrary, observed about 120 cases during his four years' service in the prison in Naples. He gives as the reason for this unusually high percentage of cases observed by him the fact that two-thirds of the inmates of the prison belonged to the Camorra, an organization whose members are gleaned from the lowest and most degenerate stratum of society, and in whom the tendency for deception and fraud in any form is highly developed. The question naturally arises, What is the reason for this rarity of cases of malingering? Is it because man has reached a state of civilization where he no longer resorts to deception? Decidedly not. The reason lies almost wholly in our changed attitude of today towards this question. As we acquire more real insight into the workings of the human mind we are prone to become more tolerant towards the human weaknesses, and in our study of the malingerer it is the type of individual, his mental make-up, which interests us most, rather than the malingered symptoms. It is for this reason that today the number of authorities is indeed small who do not look upon malingering _per se_ as a morbid phenomenon, as an abortive attempt at adjustment by an individual who is quite incapable of adequately coping with the vicissitudes of life. In my own limited experience of several years with insane delinquents I have yet to see the malingerer who, aside from being a malingerer, was not quite worthless mentally.