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Date visited: April 4, 1803
Humboldt and Bonpland and Montúfar "climbed gradually from the blazing valley of Mescala and Papagayo, where the temperatures of Reaumur’s thermometer range constantly from 28° to 31° (95° to 101° Fahr.) to a region 600 or 700 toises [3,838 to 4,477 feet] above sea level, where you find oaks and pines, and the fougere (fern) are as large as trees, and where European grains are cultivated."
A. v. Humboldt, “Philadelphia Abstract,” 1804