MARCOUX, Joseph, Canadian missionary, born in Canada about 1770; died there in 1855. After his ordination he labored among the Iroquois tribes, and was finally stationed at Caughnauaga, or Sault St. Louis, in 1819. After many trials he succeeded in rendering the Indians of h{s mission sober and industrious. He built a fine church in 1845, a large school-house, and obtained for his flock all the advantages that were enjoyed by the whites. His long intercourse with the tribe gave him a thorough mastery of their language. He composed an Iroquois grammar and French-Iroquois and Iroquois-French dictionaries, and also published a "Life of Christ," written in Iroquois, a prayer-book (1852), and a catechism (1854).