CHAPTER III.

THE WOODS.

The Habitable Earth Originally Wooded--General Meteorological Influence

of the Forest--Electrical Action of Trees--Chemical Influence of

Woods--Trees as Protection against Malaria--Trees as Shelter to Ground

to the Leeward--Influence of the Forest as Inorganic on

Temperature--Thermometrical Action of Trees as Organic--Total Influence

of the Forest on Temperature--Influence of Forests as Inorganic on

Humidity of Air and Earth--Influence as Organic--Balance of Conflicting

Influences--Influence of Woods on Precipitation--Total Climatic Action

of the Forest--Influence of the Forest on Humidity of Soil--The Forest

in Winter--Summer Rain, Importance of--Influence of the Forest on the

Flow of Springs--Influence of the Forest on Inundations and

Torrents--Destructive Action of Torrents--Floods of the

Ardeche--Excavation by Torrents--Extinction of Torrents--Crushing Force

of Torrents--Transporting Power of Water--The Po and its

Deposits--Mountain Slides--Forest as Protection against

Avalanches--Minor Uses of the Forest--Small Forest Plants and Vitality

of Seeds--Locusts do not Breed in Forests--General Functions of

Forest--General Consequences of Destruction of--Due Proportion of

Woodland--Proportion of Woodland in European Countries--Forests of Great

Britain--Forests of France--Forests of Italy--Forests of

Germany--Forests of United States--American Forest Trees--European and

American Forest Trees Compared--The Forest does not furnish Food for

Man--First Removal of the Forest--Principal Causes of Destruction of

Forest--Destruction and Protection of Forests by Governments--Royal

Forests and Game-laws--Effects of the French Revolution--Increased

Demand for Lumber--Effects of Burning Forest--Floating of

Timber--Restoration of the Forest--Economy of the Forest--Forest

Legislation--Plantation of Forests In America--Financial Results of

Forest Plantations--Instability of American Life

The Earth as Modified by Human Action · 第 3 / 18 章