[55] John Mercer's Land Book, loc. cit. (footnote 12).
[56] Petition of John Mercer, loc. cit. (footnote 17).
Mercer's first actual ownership of property came as a result of his marriage. In 1725 he purchased from his wife Catherine 885 acres of land near Potomac Church for £221 5s. and another tract of 1610 acres on Potomac Run for £322.[57] His occupancy of the Ballard house, meanwhile, was arranged on a most informal basis, three years having been allowed to pass before he paid his first and only rent--a total of 12 shillings--to his uncle-in-law David Waugh.
In January 1730 the following appears under "Domestick Expenses": "To bringing the frame of my house from Jervers to Marlbro ... 40/." Associated with this are items for 2000 tenpenny nails, 2000 eightpenny nails, and 1000 sixpenny nails, together with "To Chandler Fowke for plank," "To J^{ no} Chambers &c bring board from Landing," and "To John Chambers & Robt Collins for bringing Bricks & Oyster Shells."
In the same month the account of Anthony Linton and Henry Suddath includes the following:
By building a house at Marlborough when finished by agreement £10.0.0 By covering my house & building a Chimney 3.0.0
Clearly, the Mercers had outgrown the temporary shelter which the little Ballard house had given them. Now a new house was under construction, with the steps plainly indicated. To obtain timber of sufficient size to frame the house it was necessary to go where the trees grew. The nearest thickly forested area was north of Potomac Creek and Potomac Run. The appropriate timbers apparently grew on property owned by Mercer but occupied by the widow of James Jervis (or "Jervers"). Not only did the trees grow there, but we may be sure that there they were also felled, hewn, and cut, and the finished members fitted together on the ground to form the frame of the new house. It was a time-honored English building practice to prepare the timbers where they were felled, shaping them, drilling holes for "trunnels" (wooden pegs or "tree nails"), inscribing coded numbers with lumber markers, and then knocking the prefabricated members apart and transporting them to the building site.[58]
Oystershells and bricks for the chimney were brought from Cedar Point and Boyd's Hole, south of Marlborough, by Chambers and Collins. Shells were probably burned at the house site to make lime for mortar. Chambers was paid 12 pence a day for 32-1/2 days' work spread over a period from October 1730 to February 1731. Hugh French had been paid for 1000 bricks on August 24, 1730, while James Jones, on October 3, 1730, was recompensed three shillings for "9 days of work your Man plaistering my House & making 2 brick backs."