Its importance--The struggle among plants--Among animals--Illustrative cases--Succession of trees in forests of Denmark--The struggle for existence on the Pampas--Increase of organisms in a geometrical ratio--Examples of rapid increase of animals--Rapid increase and wide spread of plants--Great fertility not essential to rapid increase--Struggle between closely allied species most severe--The ethical aspect of the struggle for existence
CHAPTER II · THE STRUGGLE FOR EXISTENCE
From Darwinism: An Exposition of the Theory of Natural Selection by Alfred Russel Wallace.