A seven-volume English translation, published 1814 1829, of a major work describing Humboldt's 1799 1805 scientific expedition to South America.

Book VII: 20. The mouth of the Rio Anaveni. Peak of Uniana. Mission of Atures. Cataract, or Raudal of Mapara. Islet of Surupamana, and Uirapuri; 21. Raudal of Garcita. Maypures. Cataracts of Quittuna. Mouth of the Vichada and Zama. Rock of Aricagua. Siquita; 22. San Fernando de Atabapo. San Balthasar. The Rivers Temi and Tuamini. Javita. Portage from the Tuamini to the Rio Negro; Notes to Book VII; Book VIII: 23. The Rio Negro. Limits of Brazil. The Cassiquiare. Bifurcation of the Oroonoko; 24. The Upper Oroonoko, from Esmeralda to the confluence of the Guaviara. Second passage across the cataracts of Atures and Maypures. Lower Oroonoko between the mouth of the Rio Apure and Angustora, the capital of Spanish Guyana.