\u003cb\u003eVery little advancement in the treatment of delinquents or criminals can be expected if typical characteristics and their bearings on behavior are not understood.\u003c/b\u003e The whole study of characterology or the motivation of conduct is extremely new, particularly in their forensic and psychological significance. It is these characteristics that are addressed here. \u003cbr/\u003e In some cases, it is vital for the administration of justice for us to understand the types of personality and behaviors before rendering a final judgment. Some appreciation of this fact may be gained from this book which shows the possibility of tracing one form of behavior to its source.