Grateful reflexions on the signal appearances of divine providence for Great Britain : and its colonies in America, which diffuse a general joy. A sermon preached in the Old Church in Boston, October 9. 1760. Being the thanksgiving-day, on occasion of the surrender of Montreal, and the complete conquest of Canada, by the blessing of heaven on his Britannic Majesty's brave troops, under the auspicious conduct of that truly great and amiable commander, General Amherst