This book, with the subtitle "Across the Continent of South America" describes the scientific expedition of 1867 to the equatorial Andes and the Amazon. The route was from Guayaquil to Quito, over the Cordillera, through the forest to Napo, and, finally, on the Rio Napo to Pebas on the Maranon. Besides this record, the expedition - under the auspices of the Smithsonian Institute - collected samples of rocks and plants, and numerous specimen of animals. The scientists also compiled a vocabulary of local languages and produced a new map of equatorial America. James Orton (1830 - 1877) was Professor in Natural History in Vassar College, and corresponding member of the Academy of Natural Sciences of Philadelphia. (Summary by Availle, from the Preface)