In 1744, La Condamine, in charge of the expedition sent to Peru in 1735 to determine the length of a degree of the meridian arc in the neighbourhood of the equator, passed by and gave his name to one of the mountains behind Kourou.
In 1707 this map was printed at Quito and extensively copied, e.g. in the "Lettres Edifiantes" (Paris, 1781), VIII, 284, and the "N. Welt-Bott" (Augsburg, 1726, I), also in Condamine, "Relation abrégée d'un voyage fait dans l'intérieur de l'Amérique Méridionale" (Paris, 1745), which contains the revised chart of Father Fritz for comparative study.
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Charles Marie de La Condamine, seven months later, was able to give to the Académie française an account of Father Roman's voyage, and thus confirm the existence of this waterway, first reported by Father Acuña in 1639.
He was only the third European to make the entire 5,000 kilometer river journey; the first two being explorer Francisco de Orellana (1542) and geographer Charles Marie de La Condamine (1744).
Other French scientists in Peru at this time were Charles Marie de La Condamine and Pierre Bouguer.