Mr. Riddell is probably either John or Henry. John was a merchant in Dumfries. Henry, to whom GW later wrote concerning the seating of his western lands, was a merchant at Piscataway, Md., and the chief Maryland factor for Glassford & Co. of Glasgow, Scot. (GW to Henry Riddell, 22 Feb. 1774, DLC:GW; macmaster description begins Richard K. MacMaster and David C. Skaggs, eds. “The Letterbooks of Alexander Hamilton, Piscataway Factor.” Maryland Historical Magazine 61 (1966): 146–66, 305–28; 62 (1967): 135–69. description ends , 61:153 n. 32).