• I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection, in order to mark its relation to man's power of selection. But the expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.

    On the Origin of Species, 5th ed., ch. 3 (1869) See Philander Johnson 1; Herbert Spencer 5; Herbert Spencer 6