| OCR Text |
Show HYPSOMETRIO ADDENDA. 223 highland of which I have just given the levelling, and yet over which four-wheeled wagons can travel as they do.from Mexico to Santa Fe. It is formed by the broad, undulating, flattened crest of the chain of the Mexican Andes, and is not the swelling of a valley between two mountain chains, as is the case in some other remarkable elevations of plain or undulating surface-in the Northern Hemisphere, in the "Great Basin" between the Rocky Mountains and the Sierra Nevada of California,-in the Southern Hemisphere, in the high plain of the Lake of Titicaca, between the eastern and western chains of the Andes of Bolivia,-and in Asia, in the highlands of Thibet, between the Himalaya and the Kuen-liin. |
