THE CHARACTERISTICS OF THE ZONES. I. THE TROPICS 76 General: climate and weather—Temperature—The seasons—Physiological effects of heat and humidity— Pressure—Winds and rainfall—Land and sea breezes —Thunderstorms—Cloudiness—Intensity of sky-light and twilight—Climatic subdivisions: I. The equatorial belt—II. Trade wind belts—III. Monsoon belts— IV. Mountain climate.