A sermon delivered in the Presbyterian Church, Washington, Pa. September 2, 1823 : on the occasion of the designation of the Rev. Ludovicus Robbins to the work of a missionary to the heathen, and to the office of Superintendant of the mission among the Ottowa indians. / by the Rev. Andrew Wylie. To which is appended The address and instructions of the board of the Western Missionary Society delivered to him on that occasion.