President enters into agreement with Capt. Isaac R. Diller of Philadelphia to make further tests of new formula gunpowder. Report of Diller to Lincoln, 31 October 1863, Abraham Lincoln Papers, Library of Congress, Washington, DC; Abraham Lincoln to Isaac R. Diller, 15 December 1862, CW, 6:3-5.

In evening Sen. Browning (Ill.) discusses with Lincoln bill creating new state of West Virginia. Browning, Diary.