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Chapter 23 ON THE ORIGIN OF SPECIES BY VARIATION AND NATURAL

SELECTION.

Mr. Darwin's Theory of the Origin of Species by Natural Selection.

Memoir by Mr. Wallace.

Manner in which favoured Races prevail in the Struggle for Existence.

Formation of new Races by breeding.

Hypotheses of definite and indefinite Modifiability equally arbitrary.

Competition and Extinction of Races.

Progression no

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