Meteorological essays ... with an introduction by Baron Alexander von Humboldt

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Through his long-standing friendship with Humboldt, Arago was led to write popular articles on meteorology and physical geography, which ranged from discussions of the temperature of the earth, the seas, and the atmosphere to earthquakes and magnetic variations on the earth. He was particularly influential in propagating Humboldt's concept of isothermal lines and in setting down the purposes of and data required from scientific expeditions.