The state of things, therefore, which we have described, was natural. This was rendered worse by the arrival, in the winter of 1741, of a Spanish vessel, which had been captured as a prize, the crew of which was composed in part of negroes, who were sold at auction as slaves. These became very intractable, and in spite of the floggings they received, uttered threats that they knew would reach their masters' ears. Still, no evidence of any general plot against the inhabitants was suspected, and things were moving on in their usual way, when, on the 18th of March, a wild and blustering day, the Governor's house in the fort was discovered to be on fire. Fanned by a fierce south-east wind, the flames spread to the King's chapel, the secretary's house, barracks, and stables; and in spite of all efforts to save them, were totally consumed. The origin of the fire was supposed to be accidental, but a few days after, Captain Warren's house, near the fort, was found to be on fire. Two or three days later, the storehouse of Mr. Van Zandt was discovered on fire. Still, no general suspicions were aroused. Three more days passed, when a cow-stall was reported on fire, and a few hours later, the house of Mr. Thompson; the fire in the latter case originating in the room where a negro slave slept. The very next day, live coals were discovered under the stable of John Murray, on Broadway. This, evidently, was no accident, but the result of design, and the people began to be alarmed. The day following, the house of a sergeant near the fort was seen to be on fire, and soon after, flames arose from the roof of a dwelling near the Fly Market. The rumor now spread like wildfire through the town that it was the work of incendiaries. It seems to us a small foundation to base such a belief on, but it must be remembered that the public mind was in a state to believe almost anything. The alarm was increased by the statement of Mrs. Earle, who said that on Sunday, as she was looking out of her window, she saw three negroes swaggering up Broadway, engaged in earnest conversation. Suddenly she heard one of them exclaim, "Fire! fire! Scorch! scorch! a little d--n by and by!" and then throwing up his hands, laughed heartily. Coupled with the numerous fires that had occurred, and the rumors afloat, it at once excited her suspicions that this conversation had something to do with a plot to burn the city. She therefore immediately reported it to an alderman, and he, next day, to the justices. Although the number of buildings thus mysteriously set on fire was, in reality, small, yet it was as great in proportion to the town then, as three hundred would be in New York to-day. Less than that number, we imagine, would create a panic in the city, especially if the public mind was in a feverish state, as, for instance, during the recent civil war.