John Fabian Witt, whose award-winning book Lincoln’s Code: The Laws of War in American History was a finalist for the Pulitzer Prize, will present “Two Humanitarianisms” in honor of Constitution Day on Sept. 17 at 3:30 p.m. at the Boston College Law School. Witt is the Allen H. Duffy Class of 1960 Professor of Law at Yale Law School. His other notable books are Patriots and Cosmopolitans: Hidden Histories of American Law and The Accidental Republic: Crippled Workingmen, Destitute Widows, and the Remaking of American Law. In 2010 he was awarded a John Simon Guggenheim Memorial Foundation Fellowship. Sponsors: The Clough Center for the Study of Constitutional Democracy and the BC Legal History Roundtable.