Part 1 INTRODUCTION; Chapter 1 I BACKGROUND OF INQUIRY; Chapter 2 II SCOPE OF INQUIRY; Part 2 PART I ORIGIN OF TRAITS; Chapter 3 III TRAITS WHICH DO NOT VARY AMONG BODY TYPES: RELATED TO LESS THAN TWO SOCIAL FACTORS; Chapter 4 IV TRAITS WHICH DO NOT VARY AMONG BODY TYPES: RELATED TO TWO OR MORE SOCIAL FACTORS; Chapter 5 V ADDITIONAL TRAITS WHICH DO NOT VARY AMONG BODY TYPES: RELATED TO TWO OR MORE SOCIAL FACTORS; Chapter 6 VI CONTRIBUTION OF ENVIRONMENTAL FACTORS TO CONSTITUTIONAL TRAITS; Chapter 7 VII CONTRIBUTION OF ENVIRONMENTAL FACTORS TO ADDITIONAL CONSTITUTIONAL TRAITS; Chapter 8 VIII SUMMARY OF TRAIT FORMATION; Part 3 PART II Family Environment, Traits and Delinquency; Chapter 9 IX SOCIAL FACTORS, TRAITS AND DELINQUENCY; Chapter 10 X PATHOLOGY OF PARENTS, TRAITS AND DELINQUENCY; Chapter 11 XI SOME ASPECTS OF HOME CLIMATE, TRAITS AND DELINQUENCY; Chapter 12 XII FAMILY RELATIONSHIPS, TRAITS AND DELINQUENCY; Chapter 13 XIII PARENTAL UNCONCERN FOR BOY, TRAITS AND DELINQUENCY; Chapter 14 XIV FAMILY ENVIRONMENT, TRAITS, BODY BUILD AND DELINQUENCY: A SUMMARY; Part 4 CONCLUSION; Chapter 15 XV SOME IMPLICATIONS OF THE FINDINGS FOR MANAGEMENT OF DELINQUENCY; APPENDIX A CASE OF HENRY W, VirginiaAichley; APPENDIX B TRAITS; APPENDIX C SOCIAL FACTORS; APPENDIX D DATA FOR ANALYSIS OF TRAIT FORMATION BASED ON NON-DELINQUENTS OF UNRAVELING JUVENILE DELINQUENCY; APPENDIX E DATA FOR ANALYSIS OF SELECTIVE IMPACT OF FACTORS ON PHYSIQUE TYPES CHARACTERIZED BY INDICATED TRAIT; APPENDIX F DATA FOR ANALYSIS OF SELECTIVE IMPACT OF FACTORS OF FAMILY ENVIRONMENT ON DELINQUENTS CHARACTERIZED BY INDICATED TRAITS; appG APPENDIX G DATA FOR ANALYSIS OF SELECTIVE IMPACT OF FACTORS OF FAMILY ENVIRONMENT ON DELINQUENTS OF DIFFERENT PHYSIQUE TYPES; INDEX;