 He led Association in 1885 in losses with 35, hits allowed with 539, walks allowed with 117, and wild pitches with 51.He began the 1886 season with Baltimore, pitching in 19 games, but joined the Brooklyn Grays midway through the season.Henderson made his Brooklyn pitching debut on August 19, 1886 against the New York Metropolitans, losing the game 5-1.