| John Bartlett (18201905). Familiar Quotations, 10th ed. 1919. |
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| NUMBER: | 6682 |
| AUTHOR: | Charles Robert Darwin (18091882) |
| QUOTATION: | I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection. |
| ATTRIBUTION: | The Origin of Species. Chap. iii. |
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