This paper is a survey of the present position in regard to the classification of states of depression. The general confusion prevailing in this matter is commented upon and to some extent explained. Glover's suggested classification is dismissed as an example of classification epitomizing theory and worthless to others. Psycho-analytical work in the field of depression during the last few years (for example, Schilder and Klein) has shed as little light on the topic of this discussion as have published studies in heredity, psychology or somatic pathology.