Editor's preface, by J. H. Wigmore.-Director's introduction, by A. V. Lashly.- Pt. 1. The machinery of justice: Recorder felonies; an analysis and general survey, by C. E. Gehlke. The Supreme court in felony cases, by A. J. Harno. The trial courts in felony cases, by E. W. Hinton. The juries, in felony cases, in Cook county, by G. F. Fischer. The prosecuter (outside of Chicago) in felony cases, by W. D. Knight. The prosecuter (in Chicago) in felony cases, by J. J. Healy. Rural police protection, by B. Smith. The police (in Chicago) by A. Vollmer. The coroner (in Cook county) by L. Hektoen. The Municipal court of Chicago, by R. Moley. The probation and parole system, by A. A. Bruce, E. W. Burgess and A. J. Harno. Crime record systems, by W. C. Jamison.- Pt. 2. Specific types of offenses and offenders: Homocide (in Cook county) by A. V. Lashly. The juvenile delinquent, by C. R. Shaw and E. D. Myers. The deranged or defective (cont) delinquent, by H. D. Singer.- Pt. 3. Organized crime in Chicago, by J. Landesco: Introduction, by A. A. Bruce. Summary and recommendations, by E. W. Burgess