Page:Popular Science Monthly Volume 67.djvu/240

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 11,500 Feet. Summit of Volcano Irazu. 7,000 Feet. On the Sierra Candelaria. 5,000 Feet. A Street in San Rafael. 3,800 Feet. A Storm on the Volcano Irazu. 2,500 Feet. Rio Brazil. Sea Level. A Public Garden in Port Limon.

José is 67.5°; that of the sea coast is 78.0°. These figures show an average decrease of temperature of 2.8° for every 1,000 feet of altitude. Observations made in other Central American cities, though less reliable, give even higher figures. On the Mexican tropical plateau, the average decrease of temperature resulting of the ascent is only 2.3°