a genus of plants of the class Syngenesia. See BOTANY Index.

ZONE, in Geography and Astronomy, a division of the teraqueous globe with respect to the different degrees of heat found in the different parts thereof. The zones are denominated torrid, frigid, and temperate. The torrid zone is a band, surrounding the teraqueous globe, and terminated by the two tropics. Its breadth is 46° 58'. The equator, running through the middle of it, divides it into two equal parts, each containing 23° 29'. The ancients imagined the torrid zone uninhabitable. The temperate zones are contained between the tropics and the polar circles. The breadth of each is 43° 2'. The frigid zones are segments of the surface of the earth, terminated, one by the antarctic, and the other by the artic circle. The breadth of each is 46° 58'.