Unanimity and public spirit : A sermon preached at Carlisle, and some other Episcopal churches, in the counties of York and Cumberland, soon after General Braddock's defeat. Published by particular request. By the Reverend Mr. Thomas Barton, missionary to the said churches. To which is prefixed, a letter from the Reverend Mr. Smith, provost of the College of Philadelphia, concerning the office and duties of a Protestant ministry, especially in times of public calamity and danger.