During Friday, Captain Weed and Mr. Howell searched the cabin of the sloop, and found in the captain’s berth a clean linen coat and a clean shirt, both neatly folded up, and each of them cut through the folds as if with a sharp knife. The coat had a sharp, clean cut, about seven inches long, through every fold; the shirt had some shorter cuts in it. They ascertained that an auger, which lay on the cabin floor, had been used to bore two holes immediately behind the stove, for the purpose of letting off the blood, which constituted a little sea. Instead of running off, it collected in the run beneath, where it remains. In brief, the cabin, the deck, and the starboard side of the vessel bore the most unmistakable evidences of a tremendous crime having been committed on board, and committed with the utmost regard to a previously arranged plan in the mind of the murderer, for three persons had been dispatched, two on deck and one in the cabin. Public excitement continued on the increase; the public were waiting with all anxiety for a report from the pursuing officers, when, on Friday night, at a late hour, a dispatch was received from Providence, intimating that the murderer had been tracked to a private house, where he had taken lodgings, and would be arrested during the night. On Saturday, this news having been ventilated, the public excitement became greatly intensified, and it was anticipated that an effort would be made to lynch the prisoner on his arrival in the city. Crowds repaired to the railway depot, at Twenty-seventh street and Fourth avenue, also at Forty-second street, at the upper end of the Harlem Railroad. At 5 o’clock, P.M., the train arrived, containing the officers and their prisoner. But the multitudes who waited and looked for the prisoner were doomed to disappointment, for the officers had prepared themselves before reaching the city for avoiding any attack from infuriated mobs, by taking their places in the first or baggage car, thus avoiding suspicion. In this way they came down to the lower depot, and were transferred to an express wagon, and rolled down to the Second Ward station-house. THE ARREST AND HOW IT WAS EFFECTED. We give the account of the arrest in the words of Officer Nevins: