TJ kept a brief memorandum indicating that Chisholm “began to work with his negro boy 1811. May 7. or 8. plaistering the cisterns,” that he finished 24 May, and that from “June 19. to 23.” he “worked on the pier head” (MS in MHi, entirely in TJ’s hand; on a small scrap; undated). In his Farm Book TJ noted completion of his mill’s new pierhead this month, and that “it’s floor is 9 f below the spring of the brick arch, and 10 f 2 I. below the crown of the arch” (Betts, Farm Book description begins Edwin M. Betts, ed., Thomas Jefferson’s Farm Book, 1953 (in two separately paginated sections; unless otherwise specified, references are to the second section) description ends , pt. 1, 106). At this time Chisholm was also helping to renovate James Madison’s Montpellier (Madison, Papers description begins William T. Hutchinson, Robert A. Rutland, John C. A. Stagg, and others, eds., The Papers of James Madison, 1962– , 29 vols.: Congress. Ser., 17 vols.; Pres. Ser., 5 vols.; Sec. of State Ser., 7 vols description ends , Pres. Ser., 3:318–9).