MULROONEY REPORTS 16% RISE IN KILLINGS AND 23% IN HOLD-UPS; But Arrests in Murders in 1931 Show 14.8% Increase, With 18% More in Robberies. GAIN IN CONVICTIONS CITED Criminals Today Are Mostly Boys, Who Cold-Bloodedly Tell of Ruthless Acts. BURGLARY CASES DECLINED Love Affairs and Family Discord Provide Motive for More Murders Than Gang Feuds. KILLINGS ROSE 16% IN CITY LAST YEAR
Work cited in Comr's annual rept