[Ed. Note: A missing letter to Niles of 20 Apr. 1821 is recorded in SJL with the bracketed notation: “5.D.” In his financial records for that date TJ noted sending Hezekiah Niles “5.D. for a year’s Register” (MB description begins James A. Bear Jr. and Lucia C. Stanton, eds., Jefferson’s Memorandum Books: Accounts, with Legal Records and Miscellany, 1767–1826, 1997, The Papers of Thomas Jefferson, Second Series description ends , 2:1374). Niles presumably acknowledged this payment for his journal, the Baltimore Niles’ Weekly Register, in a letter to TJ of 27 Apr. 1821 from that city, also not found but recorded in SJL as written by “Henry” Niles and received 7 May 1821.]