For psychiatrists and psychologists and people dealing with mental health; not for the layman. This is an analysis of the new theory of typology of psychopathic cases, based on years of research and detailed casework. The author is a prominent English specialist. The layman has little means of evaluating this much disputed, very inchuste field, with as yet no accepted system of classification, of terminology. Dr. Bowlby divides the mentally ill under two main headings, schizoid and syntonic; then groups them further under personality subtypes. These classifications are determined through an assemblage of personality traits; then the degree of psychosis, neurosis, etc. is established, pointing to diagnosis. Supported by his own research.