In the mean time the death of a street commissioner left a vacancy to be filled. Governor King, acting under the recent law, appointed Daniel D. Conover to fill it, while the Mayor appointed Charles Devlin. A third claimant for the place appeared in the deputy, who asserted his right to act until the decision of the Court of Appeals was rendered. Conover had no idea of waiting for this, and proceeded to assume the duties of his office. The Mayor of course resisted, and so Conover got out a warrant from the Recorder to arrest the former on the charge of inciting a riot, and another on the charge of personal violence. Armed with these papers, and backed by fifty of the new policemen, he proceeded to the City Hall. The Mayor, aware of the movement, had packed the building with his own police, who refused him admittance. The new police attempted to force an entrance, when a fight followed, in which twelve policemen were severely injured. While things were in this critical condition, the Seventh Regiment passed down Broadway on its way to the boat for Boston, whither it was going to receive an ovation. A request for its interference was promptly granted, and marching into the Park they quickly quelled the riot, and the writs were served on the Mayor. Intense excitement followed, and so great was the fear of a terrible outbreak, that nine regiments were put under arms, ready to march at a moment's notice. But on the 1st of July the Court of Appeals decided the act to be constitutional, and the disturbance ended. But of course, while this strife was going on between the police, but little was done to arrest disorder in the city. The lawless became emboldened, and in the evening before the 4th of July a disturbance began, which for a time threatened the most serious consequences. DEAD-RABBITS' RIOT. The origin of the term "Dead Rabbits," which became so well known this year from being identified with a serious riot, is not certainly known. It is said that an organization known as the "Roach Guards," called after a liquor dealer by that name, became split into two factions, and in one of their stormy meetings some one threw a dead rabbit into the room, and one party suddenly proposed to assume the name. These two factions became bitterly hostile to each other; and on the day before the 4th of July came in collision, but finally separated without doing much damage. They were mostly young men, some of them being mere boys. The next day, the fight was renewed at Nos. 40 and 42 Bowery Street, and clubs, stones, and even pistols were freely used. The "Dead Rabbits" were beaten and retired, yelling and firing revolvers in the air, and attacking everybody that came in their way. Their uniform was a blue stripe on their pantaloons, while that of the Roach Guards was a red stripe. People in the neighborhood were frightened, and fastened their doors and windows. No serious damage was done, however.