In the course of the day the mob increased to the number of eight hundred persons. A large body of them attacked a shoe store on Grand street, and having appropriated every article of property it contained they set the building on fire, and reduced it to ashes. The citizens of the Tenth, Eleventh, Fifteenth, Seventeenth, and Nineteenth Wards having organized themselves into Committees of Safety, patrolled the streets carrying arms. Toward evening the Tenth, and Sixty-fifth regiments returned to the city, and were loudly cheered as they walked up Broadway. This somewhat sobered the rioters, but robbery and pillaging continued during the succeeding night, although both the military and police were on the alert. On this day the excitement had spread on the one side of the city to Brooklyn; and on the other to Hoboken; fires occurring in both cities ignited by the incendiaries, who profited by their wicked acts. Boston, Troy, Buffalo, and very many other cities of the North suffered by the riot during the fifteenth, and for several days succeeding. THE FOURTH DAY. The morning of the fourth day of the riot opened under auspicious circumstances. People awoke to find the cars and omnibuses running, and they never were so glad to see them before. The railroads and stage lines were assured ample protection by an order of Governor Seymour requiring General Sandford to furnish the Police Commissioners such force as they might require to protect their depots and stables. The public confidence was still further increased by the arrival of the Seventh, and Seventy-fourth Regiments, and the battery of the Eighth. The Sixty-fifth, Colonel Burns, of Buffalo, was placed by Governor Seymour under the orders of General Wool, and at an early hour three companies of it were assigned to the sub-treasury building. The other four companies were retained for street service at General Brown’s headquarters. The battery of the Eighth regiment, Captain Brown, which arrived with the Sixty-fifth, was threatened by a mob at the Battery, but the two negro servants accompanying it were firmly protected. The expectation of the other regiments, five of New York and five of Brooklyn, whose return Governor Seymour had requested, tended to increase the feeling of safety which was growing with the citizens. A Michigan regiment, whose term of service had nearly expired, was also expected to return home by way of the metropolis. The appropriation, moreover, of two million five hundred thousand dollars by the Common Council to satisfy the three hundred dollar exemption clause, withdrew most of those who feared the draft from the mob; and few but the thieves were left.