Note 50 — THE PLATEAU OF CAXAMARCA, THE ANCIENT CAPITAL OF THE INCA ATAHUALLPA: AND THE FIRST VIEW OF THE PACIFIC OCEAN, FROM THE CREST OF THE ANDES.

p. 280.—“Which, on account of an old observation of La Condamine, was of some importance to the geography of South America.”

I desired to connect chronometrically Tomependa, the point at which La Condamine began his voyage, and other places geographically determined by him on the Amazons river, with the town of Quito. La Condamine had been in June 1743, (59 years before me) at Tomependa, which place I found, by star observations taken for three nights, to be in south lat. 5° 81´ 24´´, and west longitude from Paris 80° 56´ 37´´ (from Greenwich 78° 84´ 55´´). Previous to my return to France the longitude of Quito was in error to the full amount of 50½ minutes of arc, as Oltmanns has shown by my observations, and by a laborious recalculation of all those previously made. (Humboldt, Recueil d’Observations Astron., vol. ii. p. 309-359). Jupiter’s satellites, lunar distances, and occultations, give a satisfactory accordance, and all the elements of the calculation are placed before the public. The too easterly longitude of Quito was transferred by La Condamine to Cuenca and the Amazons river. “Je fis,” says La Condamine, “mon premier essai de navigation sur un radeau (balsa) en descendant la rivière de Chinchipe jusqu’à Tomependa. Il fallut me contenter d’en déterminer la latitude et de conclure la longitude par les routes. J’y fis mon testament politique en rédigeant l’extrait de mes observations le plus importantes.” (Journal du Voyage fait à l’Equateur, 1751, p. 186.)