La Condamine's journal of his ten year long voyage to South America, the scientific results of which included proof that the earth is a spheroid flattened at the poles. Other scientific observations including botanical studies of cinchona and rubber trees, and the recognition that cinchona bark was a remedy for malaria. La Condamine was also the first European to report on the South American botanic alkaloid poison curare. He was also one of the first to explore the Amazon. Digital facsimile of the 1751 volume from Biodiversity Heritage Library at this link. Digital facsimile of the supplement from the Hathi Trust at this link.

In 1745 Condamine issued an abridgment of the journal prior to the full publication: Relation abrégée d'un voyage fait dans l'intérieur de l'Amérique méridionale. Depuis la côte de la Mer du Sud, jusqu'aux côtes du Brésil & de la Guiane, en descendant la rivière des Amazones.

This was translated into English as A succinct abridgment of a voyage made within the Inland parts of South America from the coasts of the South Sea to the coasts of Brazil & Guiana, down the Rrver of Amazonas. London: E. Withers, 1747.