Both Casper and Tardieu discuss the topic of sexual inversion with antipathy. But there are notable points of difference in the method and in the conclusions of the two authors. Tardieu, perhaps because he is a Frenchman, educated in the school of Paris, which we have learned to know from Carlier, assumes that all subjects of the passion are criminal or vicious. He draws no psychological distinction between pæderast and pæderast. He finds no other name for them, and looks upon the whole class as voluntarily degraded beings who, for the gratification of monstrous desires, have unsexed themselves. A large part of his work is devoted to describing what he believes to be the signs of active and passive immorality in the bodies of persons addicted to these habits.[13] It is evident that imagination has acted powerfully in the formation of his theories. But this is not the place to discuss their details.[14] Casper and Liman approach the subject with almost equal disgust, but with more regard for scientific truth than Tardieu. They point out that the term pæderast is wholly inadequate to describe the several classes of male persons afflicted with sexual inversion. They clearly expect, in course of time, a general mitigation of the penalties in force against such individuals. According to them, the penal laws of North Germany, on the occasion of their last revision, would probably have been altered, had not the jurists felt that the popular belief in the criminality of pæderasts ought to be considered.[15] Consequently, a large number of irresponsible persons, in the opinion of experts like Casper and Liman, are still exposed to punishment by laws enacted under the influence of vulgar errors. These writers are not concerned with the framing of codes, nor again with the psychological diagnosis of accused persons. It is their business to lay down rules whereby a medical authority, consulted in a doubtful case, may form his own view as to the guilt or innocence of the accused. Their attention is therefore mainly directed to the detection of signs upon the bodies of incriminated individuals.