CHAPTER VI.
THE AËRIAL AND TERRESTRIAL MIGRATIONS OF THE WATERS.
Movements of the Waters through Evaporation.--Origin of Winds.-- Trade-Winds.--Calms.--Monsoons.--Typhoons.--Tornadoes.--Water-Spouts. --The Formation of Atmospherical Precipitations.--Dew.--Its Origin. --Fog.--Clouds.--Rain.--Snow.--Hail.--Sources.--The Quantities of Water which the Rivers pour into the Ocean.--Glaciers and their Progress.--Icebergs.--Erratic Blocks.--Influence of Forests on the Formation and Retention of Atmospherical Precipitations.-- Consequences of their excessive Destruction.--The Power of Man over Climate.--How has it been used as yet? 65