You are now familiar with the kind of punishment meted out to one whom the gang suspects of having betrayed a member. You have also been acquainted with the Sicilian custom of revenge by way of an actual example showing how the slayer of the man in the barrel came to his end in a manner that is as certain as daylight follows darkness. It is the racial idea of the antique Hebrew law, "An eye for an eye and a tooth for a tooth." The Sicilian "vendetta" demands a life for a life. You may have noted further that the police of New York and the machinery of the law failed to track down the slayer of the man in the barrel. A circumstance that makes it singularly difficult for the authorities to cope with this type of criminals is that the Sicilian does not ask the police for help when a member of his family is murdered. He keeps it quiet. And as quietly a blood relative of the slain person assumes the responsibility which we Americans place on the police and the courts. The end of Petto, the Ox, shows exactly what happens when individual vengeance succeeds in place of justice meted out by a court of law. The reader will remember that when the criminal band, which the police rounded up in connection with the barrel murder, were turned out by the police magistrate, because there was insufficient evidence to hold them for the murder of Benedetto, the suspects dropped out of sight as far as the police of New York were concerned. The Secret Service kept its eagle eye on them, however. Every suspect was carefully "shadowed" by a special operative. We expected that they would gravitate back to their haunts, and they did. We spotted them in such places as the café of Pietro Inzarillo, at No. 226 Elizabeth Street, and in the dark, little Italian grocery shop of Ignazio Lupo, at No. 8 Prince Street, which is just around the corner from Inzarillo's place. We also located suspects loafing around the dingy, garlic-smelling restaurant of Giuseppe Morello, tucked away in the rear of Lupo's grocery shop, like an evil thing afraid of the light of day.