Lincoln presents petition for charter for Springfield Mechanics Union, which is referred to select committee of himself, Henry of Morgan, and Green of Greene. He introduces for John Bennett petition (written Monday) praying vacation of part of Bennett's addition to Petersburg. It is referred to committee of which Lincoln is chairman.House Journal; Petition Written for John Bennett, 16 December 1839, CW, 1:157; Amendment Introduced in Illinois Legislature to Bill Incorporating the Springfield Mechanics' Union, [19 December 1839], CW, 1:158.