[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . ^ ocean of gray cloud resting becalmed upon hill andplain, or creeping slowly upon still water. 28 ATMOSPHERIC FORMS. We live in a sea of boiling air, and when its local move-ments are made visible by clouds ; heat, cold, and gravitation—radiating and converging forces—are seen at work in theatmosphere. Force is revealed by form. On these forces and on these movements depend all atmo-spheric changes and the science of meteorology, which treatsof Fio. 8. Diagram of the Winds
[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . ^ ocean of gray cloud resting becalmed upon hill andplain, or creeping slowly upon still water. 28 ATMOSPHERIC FORMS. We live in a sea of boiling air, and when its local move-ments are made visible by clouds ; heat, cold, and gravitation—radiating and converging forces—are seen at work in theatmosphere. Force is revealed by form. On these forces and on these movements depend all atmo-spheric changes and the science of meteorology, which treatsof Fio. 8. Diagram of the Winds, by Lieut. Maury, Abstracts of Meteorological Observations, etc., edited by : Eyre and Spottiswoode, 1S50. OHAPTEE VT. METEOROLOGY. The modern science of meteorology is founded upon upwardand downward movements in the whole atmosphere. All storms have been traced to the movements of twogreat currents in each hemisphere, which move like local cur-rents, and for the same reason. These are north-east or northpolar, south-west or equatorial, in the northern hemisphere ;south-east or south polar, north-west or equatorial, in thesouthern hemisphere. These great cuiTents are attributed to upward and down-ward movements :—to the rising of light warm air near theequator, and to the falling of heavier colder air at the movements then, whether large or small, generalor local, are attributed to the action of heat, cold, and these simple movements are modified by the earthsrotation and by change of weight. A
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