Des lignes isothermes et la distribution de la chaleur sur le globe

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As a result of Humboldt's five-year scientific expedition to the Americas, he laid the foundation of the science of meteorology. "By his delineation (in 1817) of 'isothermal lines,' he suggested the idea and devised the means of comparing the climatic conditions of various countries. He first investigated the rate of decrease in mean temperature with increase of elevation above the sea-level and afforded, by his enquiries into the origin of tropical storms, the earliest clue to the detection of the more complicated law governing atmospheric disturbances in higher latitudes."