. . . . . . . . . "Letter to the Rev. John Bachman, D.D., on the question of hybridity in animals : considered in reference to the unity of the human species" . . . . "Letter to the Rev. John Bachman, D.D., on the question of hybridity in animals, considered in reference to the unity of the human species"@en . "Letter to the Rev. John Bachman, D.D., on the question of hybridity in animals, considered in reference to the unity of the human species" . "Letter to the Rev. John Bachman, D.D., on the question of hybridity in animals considered in reference to the unity of the human species"@en . . . . "Chimera Letter." . . "Religion and Science Letter." . . "Hybridization." . .