Officer LOCUST, being called to testify, stated that his attention was directed to the prisoner, on Tuesday afternoon last, by some boys in Fourteenth Street. Prisoner was standing on the side-walk, on the side of the street opposite Tammany Hall. He was armed with a small pewter squirt, with which he was trying to smear the front of that building by drawing up dirty water from the gutter. The range of the squirt did not appear to reach more than half-way across the street. The water used was very foul, leaving stains upon a dirt-cart that was passing. While witness was watching the prisoner, the Hon. WM. M. TWEED came down the steps from Tammany Hall, and, upon seeing him, prisoner ran away, but was seized by witness, before he could make his escape. On being interrogated by the magistrate, prisoner said that he hardly knew what he was doing when arrested. The _Sun_ was in his eyes at the time. If it hadn't been so, he would not have missed his shot. He must do something for a living, and he thought that throwing dirty water was as good an occupation as any other. Had made money out of it by threatening respectable people with his pewter squirt, and they would give him money rather than have their clothes soiled. He would do anything to make money; and he didn't in the least mind dirtying his hands in the making of it. To a question by the magistrate, as to whether he had had anything to do with casting offal into the bay, prisoner laughed in a wild manner, and said that he, for one, could never be accused of wasting good, honest dirt in that way. All the offal in the world, said prisoner, wasn't too much for him to use in bespattering the objects of his attention, friends as well as foes. He had heaved tons of offal, already, at Mr. A. OAKEY HALL, (whom he evidently imagined to be an Irishman, and called O'HALL,) He didn't care whom he hit, in fact, so long as he could make it pay. A gentleman connected with the velocipede interest, whose name our reporter did not catch, here stated that he became acquainted with prisoner nearly two years ago, while the velocipede frenzy was at its height. He had constructed to order for the prisoner a peculiar velocipede called the _"Sun Squirt."_ It had a Dyer's tub attached to it, which was filled with bilge-water. On this machine, the prisoner, armed with a pewter squirt, used to practise for several hours a day, careering rapidly around the rink, and taking flying shots, as he went, at large posters attached to the wall, having portraits on them of General GRANT, Hon. H. GREELEY, Hon. WM. M. TWEED, The Mayor, Governor HOFFMAN, and several other citizens of admitted position and respectability. The bilge-water usually came back upon him, however, and he was generally a humiliating object on leaving the rink.