Kitap 2
CHAPTER III.
3.1
POLYBIUS supposes six zones: two situated between the poles and the arctic circles; two between the arctic circles and the tropics; and two between the tropics which are divided by the equator. However, it appears to me that the division into five zones accords best both with the order of external nature and geography. With external nature, as respects the celestial phenomena, and the temperature of the atmosphere. With respect to the celestial phenomena, as the Periscii and Amphiscii are thereby divided in the best possible manner, and it also forms an excellent line of separation in regard to those who behold the stars from an opposite point of view.Viz. the Heteroscii, or inhabitants of the temperate zones. With respect to the temperature of the atmosphere, inasmuch as looked at in connexion with the sun, there are three main divisions, which influence in a remarkable degree both plants, animals, and every other animated thing, existing either in the air, or exposed to it, namely, excess of heat, want of heat, and a moderate supply of heat. In the division into [five] zones, each of these is correctly distinguished. The two frigid zones indicate the want of heat, being alike in the temperature of their atmosphere; the temperate zones possess a moderate heat, and the remaining, or torrid zone, is remarkable for its excess of heat.
