Comparative clinico-psychopathological analysis was employed to study the structure of affective disorders in the depressive phases in monopolar (48 patients) and bipolar (25 patients) pure-affective psychosis. The clinical heteronomy of recurrent depression is demonstrated and two varieties therefore are distinguished. The potentially bipolar variety (24 patients) manifests noticeable similarity to bipolar psychosis in accordance with predominance of anergic depression, dynamics of the onset, phases and disease course on the whole. The relatively autonomous "anxiety" variety (24 patients) appeared to be unusual in nature: steadily seen anxious modality of depression, gradual onset and completion of the phases, their protracted course and lack of the discreteness traits, later onset of psychosis, frequency of the anxious-hypochondriac habits before disease. It is assumed that monopolarity is an essential trait of the morbid process in patients with the above variety.