| I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection. |
| —The Origin of Species. Chap. iii. |
| Charles Robert Darwin |
Title: Charles Robert Darwin
Author: Darwin, Charles
The Origin of Species
The revolutionary theory of evolution. From the Harvard Classics, Vol. XI. The Voyage of the Beagle
Popular account of a five-year journey of geological, botanical, biological and paleontological observation. From the Harvard Classics, Vol. XXIX. Bartlett’s Darwin Quotations
Epitomal selections by John Bartlett.
