In 1897, building on his earlier scientific expedition reports, Henri Coudreau (1859-1899) published this account of his third mission on behalf of the governor of Brazil's Para state: Voyage au Tocantins-Araguaya. Coudreau continues his practice of including illustrations, statistical tables, indigenous vocabularies, and maps to complement the detailed account of his progress along this Amazonian tributary. His observations reveal his geological background and interests; however, Coudreau also assumes the role of anthropologist as he documents various aspects of indigenous groups, including their customs and beliefs. In addition to his remarks on villages, peoples, and the region's flora and fauna, Coudreau records his thoughts and concerns about increasing industrialization and the potential for urbanization and growth in Para. His opinion that the people of Para possess the same bold and enterprising spirit as their 'Yankee' neighbours is characteristic of Coudreau's personal interest in the subjects of his study.