The multiplicity of classifications of the psychopathic personality shows how important it is that a definite effort should be made to limit the syndrome, and to prevent a number of indefinite conditions being classified under this heading. The greatest danger appears to be to allow any prepsychotic state to be labelled with this diagnosis. If there is slight but definite evidence of an abnormal psychotic state, this diagnosis should be made. As pointed out the inclusion of the milder cyclothymic cases and early schizoid cases under the heading of psychopathic personalities complicates and confuses a type of psychiatric work already vague and indeterminate.