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But the torrid zone divides the two temperate regions from each other by the space of more than forty-six degrees, and the torrid and temperate zones together form a much broader line of division between the two arctic regions. The Atlantic and Pacific Oceans, and the Persian Gulf, also divide the various portions of continent in the torrid and temperate zones from each other.
In ascending our equatorial, tropical, and sub-tropical mountains, we find, of course, at their several bases, the temperature of the zones in which they respectively lie; from two thousand to three thousand feet, we reach the next higher zone, and so on, at about the same ratio of altitude, until we ascend to the polar zone or the line of perpetual ice and snow.
But how would these forms have managed, even then, to cross the thermal equator and secure a permanent habitat in the present warm and cold temperate zones of that continent? Manifestly, this question has never been practically solved, nor is it ever likely to be in our day or generation. It is nevertheless susceptible of solution, as Mr. Darwin thinks, by easy mental processes.
It might even be inferred that such was the case, so rich did this region appear in the most magnificent specimens of the flora of the temperate zones.
But attractive as this picturesque grouping of avenues and edifices may be, the attraction does not belong to the outside alone: inside the great doors of the majestic halls you will find that time has wings while you pass in review the trophies of all the zones, and of the meteoric heavens too, preserved in the Smithsonian, or the archives of the country in the Patent Office.
In order to rectify those errors it is important that the mean temperature of the year and months be well known, as also the thermometric oscillations in different seasons at the parallel of the Havannah; and to prove by an exact comparison with other points alike distant from the equator, for instance, with Rio Janeiro and Macao, that the lowering of temperature observed in the island of Cuba is owing to the irruption and the stream of layers of cold air, borne from the temperate zones towards the tropics of Cancer and Capricorn.
In view of the modern methods by which, on purchase, there is a Treasury guarantee, inspection before sale tends to reduce the price, and the absence of inspection under the zones has tended to enhance prices.
Mandeville has become proverbial for indulging in a traveler's exaggerations; yet his accounts of the countries which he visited have been found far more veracious than had been imagined. His descriptions of Cathay, and the wealthy province of Mangi, agreeing with those of Marco Polo, had great authority with Columbus. No. The Zones.
Whatever of importance is accomplished in those countries where climate has overpowered a race is best and principally done by the men of the temperate zones, who carry with them perseverance, courage, and ability, and maintain their ascendency, true to their type, while they have their life to live. But with our own eyes we may perceive how much climate affects agriculture.
Symbols and ratios carry us and bring us forth and beat us down; gravity that swings the incommensurable suns and worlds through space, is but a figment varying inversely as the squares of distances; and the suns and worlds themselves, imponderable figures of abstraction, NH3, and H2O. Consideration dares not dwell upon this view; that way madness lies; science carries us into zones of speculation, where there is no habitable city for the mind of man.
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