Discussion on American slavery : between George Thompson, Esq., agent of the British and Foreign Society for the abolition of slavery throughout the world, and Rev. Robert J. Breckinridge, delegate from the General Assembly of the Presbyterian Church in the United States, to the congregational union of England and Wales, holden in the Rev. Dr. Wardlaw's chapel, Glasgow, Scotland, on the evenings of the 13th, 14th, 15th, 16th, 17th of June, 1836, with an appendix.