Title: The excellency and advantage of doing good: represented in a sermon preached before the honourable trustees for establishing the colony of Georgia in America, and the associates of the late reverend Dr. Bray, ... March 17, 1747-8. In the parish church of St. Margaret, Westminster. By Ralph Thoresby, ... To which is annex'd, a letter of Samuel Loyd, Esq; concerning the nature and goodness of the Georgia silk