 In 1862 he vindicated in London before large audiences the cause of the union against secession with vigorous eloquence.Among his other published works are a "View of the Valley of the Mississippi" (1832); "History of the Temperance Societies" (1836); "Visit to Northern Europe" (1841)" "Protestantism in Italy" (Boston, 1845); " Impressions and Experiences of the West Indies and North America in 1849" (Philadelphia, 1850), revised, with a supplement, in 1855; "History of the Albigenses, Waldenses, and Vandois.