Wilkins attempts to define briefly a common ground between the two theories of human behavior, using depression as the phenomenon studied. He establishes parallels between the psychoanalytic understanding of depression in the concepts of object loss, loss of self-esteem, and lack of gratifications on the one hand, and the behaviorist's 'removal of reinforcing stimuli' and 'alteration of reinforcement contingencies' on the other hand. The article is an interesting exercise in 'comparative theory' but, unfortunately, the omission by the author of the role of aggression in the formation of depression renders the seeming parallels between the two theories highly questionable.