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The Life and Voyages of Christopher Columbus_Volume 2, a non-fiction book by Washington Irving |
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Appendix - No. 23 |
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_ Appendix. No. XXIII. The Zones.
The central region, lying beneath the track of the sun, was termed the torrid zone; the two regions between the tropics and the polar circles were termed the temperate zones, and the remaining parts, between the porlar circles and the poles, the frigid zones. The frozen regions near the poles were considered uninhabitable and unnavigable on account of the extreme cold. The burning zone, or rather the central part of it, immediately about the equator, was considered uninhabitable, unproductive, and impassable in consequence of the excessive heat. The temperate zones, lying between them, were supposed to be fertile and salubrious, and suited to the purposes of life. The globe was divided into two hemispheres by the equator, an imaginary line encircling it at equal distance from the poles. The whole of the world known to the ancients was contained in the temperate zone of the northern hemisphere. It was imagined that if there should be inhabitants in the temperate zone of the southern hemisphere, there could still be no communication with them on account of the burning zone which intervened. Parmenides, according to Strabo, was the inventor of this theory of the five zones, but he made the torrid zone extend on each side of the equator beyond the tropics. Aristotle supported this doctrine of the zones. In his time nothing was known of the extreme northern parts of Europe and Asia, nor of interior Ethiopia and the southern part of Africa, extending beyond the tropic of Capricorn to the Cape of Good Hope. Aristotle believed that there was habitable earth in the southern hemisphere, but that it was for ever divided from the part of the world already known, by the impassable zone of scorching heat at the equator. [346] Pliny supported the opinion of Aristotle concerning the burning zones. "The temperature of the central region of the earth," he observes, "where the sun runs his course, is burnt up as with fire. The temperate zones which lie on either side can have no communication with each other in consequence of the fervent heat of this region." [347] Strabo, (lib. xi.,) in mentioning this theory, gives it likewise his support; and others of the ancient philosophers, as well as the poets, might be cited to show the general prevalence of the belief. It must be observed that, at the time when Columbus defended his proposition before the learned board at Salamanca, the ancient theory of the burning zone had not yet been totally disproved by modern discovery. The Portuguese, it is true, had penetrated within the tropics; but, though the whole of the space between the tropic of Cancer and that of Capricorn, in common parlance, was termed the torrid zone, the uninhabitable and impassable part, strictly speaking, according to the doctrine of the ancients, only extended a limited number of degrees on each side of the equator; forming about a third, or, at most, the half of the zone. The proofs which Columbus endeavored to draw therefore from the voyages made to St. George la Mina, were not conclusive with those who were bigoted to the ancient theory, and who placed this scorching region still farther southward, and immediately about the equator. _ |
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