The really important gangs of New York are four. There are other less important institutions, but these are little more than mere friendly gatherings of old boyhood chums for purposes of mutual companionship. In time they may grow, as did Bat Jarvis's coterie, into formidable organisations, for the soil is undoubtedly propitious to such growth. But at present the amount of ice which good judges declare them to cut is but small. They "stick up" an occasional wayfarer for his "cush," and they carry "canisters" and sometimes fire them off, but these things do not signify the cutting of ice. In matters political there are only four gangs which count, the East Side, the Groome Street, the Three Points, and the Table Hill. Greatest of these by virtue of their numbers are the East Side and the Groome Street, the latter presided over at the time of this story by Mr. Bat Jarvis. These two are colossal, and, though they may fight each other, are immune from attack at the hands of lesser gangs. But between the other gangs, and especially between the Table Hill and the Three Points, which are much of a size, warfare rages as briskly as among the republics of South America. There has always been bad blood between the Table Hill and the Three Points, and until they wipe each other out after the manner of the Kilkenny cats, it is probable that there always will be. Little events, trifling in themselves, have always occurred to shatter friendly relations just when there has seemed a chance of their being formed. Thus, just as the Table Hillites were beginning to forgive the Three Points for shooting the redoubtable Paul Horgan down at Coney Island, a Three Pointer injudiciously wiped out another of the rival gang near Canal Street. He pleaded self-defence, and in any case it was probably mere thoughtlessness, but nevertheless the Table Hillites were ruffled. That had been a month or so back. During that month things had been simmering down, and peace was just preparing to brood when there occurred the incident to which Pugsy had alluded, the regrettable falling out of Dude Dawson and Spider Reilly at Mr. Maginnis's dancing saloon, Shamrock Hall, the same which Bat Jarvis had been called in to protect in the days before the Groome Street gang began to be. Shamrock Hall, being under the eyes of the great Bat, was, of course, forbidden ground; and it was with no intention of spoiling the harmony of the evening that Mr. Dawson had looked in. He was there in a purely private and peaceful character. As he sat smoking, sipping, and observing the revels, there settled at the next table Mr. Robert ("Nigger") Coston, an eminent member of the Three Points.