The British brig Mystery, of St. Johns, N. B., was seized by the Surveyor of the port of New York, to-day, under suspicion of having run the blockade at Georgetown, S. C. Letters of instruction and the charter party, found on board, clearly show that there was a plan to land a cargo of ice at that rebel port, but the Consular certificate at Havana proves that the Mystery entered the latter port on the 7th of August, with the identical cargo of ice, and two days afterward cleared for Matanzas, where she received a cargo of sugar, and then sailed for the North, coming into the port of New York.--N. Y. Times, September 17.
The Second regiment, of Kansas Volunteers, arrived at Leavenworth, from Rolla, Mo.--Ohio Statesman, September 21.
Col. F. P. Blair, Jr., was ordered by the Provost-marshal, at St. Louis, Mo., to report himself under arrest on the general charge of using disrespectful language when alluding to superior officers.--Louisville Journal, Sept. 17.
About three o'clock this afternoon a force of five hundred rebels attacked a portion of the troops under Col. Geary, stationed about three miles above Harper's Ferry, on the Potomac. Col. Geary commanded in person, and the fight lasted about three hours. The enemy were driven from every house and breastwork, and no less than seventy-five of them are reported as killed and wounded. The National loss is one killed and a few slightly wounded. The troops behaved like veterans. Companies B, D, and I, of the Twenty-eighth Pennsylvania regiment, and two companies of the Thirteenth Massachusetts, were engaged in the conflict. During the fight a rebel was seen taking aim at Col. Geary, when the colonel grasped a rifle from a soldier and shot him on the spot.--(Doc. 50.)
The Thirty-ninth Ohio, Colonel Groesbeck; Third Iowa, Lieutenant-Colonel Scott; Sixteenth Illinois, Colonel Smith, with a force of the Missouri State Militia and Iowa State troops, under Colonels Craynon and Edwards; three hundred regulars and irregular cavalry and six pieces of artillery, under Captain Madison, left St. Joseph and Chillicothe, Mo., in two columns for Lexington, to-day, on their way to reinforce Colonel Mulligan.--N. Y. Herald, September 20.
This morning the Abbe McMaster, proprietor and editor of the Freeman's Appeal, a peace organ of New York city, was arrested by the United States Marshal, Mr. Murray, and sent to  Fort Lafayette, on a charge of treasonable matter contained in his paper.--N. Y. Herald, September 17.