Introduction -- Repo r t to the imperial government of Brazil, by José a nd Francisco Keller -- Explo r ation of the rivers, etc., of the Department of the Beni, by J.A. Palacios -- Paper on the Bolivian rivers, by Thaddeus Haenke -- The rapids of the river Madeira, by Lieut. Gibbon, U.S. Navy -- The Madeira a nd its head waters, by General Quintin Quevedo -- Fluvial outlet fo r Bolivia, by Ygnacio Arauz -- The Po r tuguese explo r ing expedition of 1749, fr om Pará to Mato Grosso...[written by José Gonsalves da Fonseca]