This is Volume XIX of a series of nineteen on Abnormal and Clinical Psychology. Originally published in 1932, this study looks at practical applications and bio-physiological foundations of Kretschmer's types. This work has two main aims: First: To apply the clinically originated constitution psychological typology of Kretschmer (with the extensions of Delbriick, Pfahler, etc.) to male juvenile delinquents. Secondly, to co-ordinate-as far as it was possible within the specialized framework-the bio-typologies of Kretschmer, Jaensch, Pende, Berman, Wiersma, etc., in so far as there appears to be similarity between the underlying biological principles of these typologies and those of Kretschmer's typology.

W A, Willemse

I Problems and Aims. II Materials and Methods III. Types of Physique. IV. Mental Side of Schizo-type V. Psychical (including Delinquent) Characteristics of Athletics VI. Mental Qualities (including Delinquency) of Pyknics VII. Mental (including Delinquent) Qualities of Some Dysplastic Types VIII. Co-ordinations with some other Typo­logical Studies IX. Bio-Physiological Bases of the Topological Differences