This volume presents what are indeed case studies; they are voluminous and full; the pages are large and double columned. This is the second of these studies by the author, well known in the field of criminology. With its great size this volume contains only four cases: A Mail Thief and Drug Addict, A Mann Act Violator, A Rapist, and A Train Robber. These studies should be invaluable for those unable to examine directly the criminotic individual at close range and for lengthy periods of time.