The purpose of the study was to define, by means of psychological tests, certain personality traits of suicidal patients, & to determine if there are differences between suicidal subgroups. 96 male hospital patients were separated into serious attempt, non-serious, & control groups. Significant differences were found between suicidals & controls, the former exhibiting more disturbed behavior. Suicidals differed each other in degrees of hostility, agitation, aggression, affect, & irritability.