Abraham Lincoln, seated and holding a book, with his son Tad (Thomas) leaning on a table. Copy of photo by Alexander Gardner taken at Gardner's Gallery in Washington, DC, on Sunday, February 5, 1865. This last photo session from life was long thought to have happened on April 10, 1865, but more recent research has indicated the earlier date in February. Photographic print : gelatin silver ; 8 x 10 in.