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The climatic contrasts occasioned by the mountainous relief, are sharply produced only in the middle portion of the Republic, that is to say, in the central mesa and upon the slopes of the cordillera. The section from one coast to the other, from Vera Cruz to Acapulco, for example, is the line best situated for observing well-marked climatic changes.

The low zone of the seaboard contains, at once, the marshes and the barren sands of the coast, the well-watered open plains, and the lower slopes, where the luxuriant branchings of a thousand differing trees mingle and crowd, closely bound together by festoons of trailing and pendent vines, forming lovely masses of verdure, sprinkled through with fruits of many and brilliant colors, which stand out conspicuously from the magnificent, chlorophyll-laden foliage, and above all of which tower the graceful forms of palm trees. To such a charming tropical combination is given the name—tierra caliente (hot land).

Within this range, where the temperature passes 23° C., there are places which must be included among the hottest on the globe; such, for example, is the port of La Paz, in Lower California. The high temperature of this region, gave to it the name, derived from the words calida fornax, which signify hot oven.

Above the two seaboard zones, one sloping toward the Gulf, the other toward the Pacific, rises the tierra templada (temperate land), at an altitude of from 1000 m. to 2000 m., but higher in the south than in the north. This region corresponds to the southwest of Europe, not so much in climate—for it has no winter—as in mean temperature, productivity and salubrity.

Lastly, the central tableland, the part of the territory where the maguey is cultivated with notable profit and every class of cereals is produced, constitutes the tierra fria (cold land). It is the most populous part of the Republic.

In the high valleys, as those of Toluca and Mexico, the descent of the mercurial column often shows considerable falls of temperature; in winter the column reaches 8° or 10° below 0 C. and frosts are frequent. In general, however, the winters are mild. The mean temperature is from 13° to 14° C.

In many places exceptional conditions have brought the vegetable areas into abrupt juxtaposition; thus, while upon the summit of some ridge, only plants of European character may live and flourish, in the plains surrounding it are seen palms and bananas. From the summit of the great volcanoes, the three superposed zones may be clearly seen, at once.

The rapid communication, which today happily exists, presents to the traveler the marvelous opportunity of passing, in a few hours, through the three distinct regions of which we speak, which in other parts of the globe are separated by thousands of kilometres.

In some places these zones remain clearly distinguished from one another, but this is exceptional, since commonly they crowd upon each other, mingling one with another by imperceptible transitions. It is common to mention some certain place as belonging to one and the other zone, because the line of separation for both runs irregularly in mountainous regions. A zone of reciprocal penetration has been formed, on account of the multiple phenomena of temperature, of winds and of plant groupings. So, too, cañons and slopes are met with, which, by their vegetation, may be considered foci of tierra caliente, included within the fully developed tierra templada.