John C. Calhoun's last speech had a bitter attack on Mr. Jefferson for his amendment to the Ordinance of '87 prohibiting slavery in the Northwest Territory. Calhoun was in a dying condition – was too weak to read it. So James M. Mason, a Virginia Senator, read it in the Senate about two weeks before Calhoun's death, March 1850.

Letter to Samuel "Sam" Chapman (June 1907)