The monograph consists of eleven essays: 1, Existing Tendencies, Recent Developments and Correlations in the Field of Psychopathology; II, The Comparative Method in Psychiatry (Psychopathology); III, The Human Organism as an Energy System; IV, Individuality and Introversion; V, Primitive Mentality and the Racial Unconscious; VI, Two Deflecting Traditions; VII, The Significance of Psychopathology for General Somatic Pathology; VIII, Psychoanalytic Parallels; IX, Primitive Mentality; X, The Adlerian Concept of the Neuroses, and XI, Physical Biology; all of which have been, published elsewhere in the various medical and psychological periodicals, and while the titles indicate a great diversity of topics and a wide field of endeavor the contents are closely related and emanate from a certain fundamental point of view, which may be called the functional attitude toward the old metaphysical mind and body problem. Such metaphysical abstractions concerning these two aspects of function may be successfully dispensed with if the organism is considered in its proper role as a unity of biological function.