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