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From William Horsfall 7 February 1882
Summary
Asks about significance of trilobites for evolution.
Asks if any organism can be designated as animal in one stage and vegetable in another.
| Author: | William Horsfall |
| Addressee: | Charles Robert Darwin |
| Date: | 7 Feb 1882 |
| Classmark: | DAR 145: 359 |
| Letter no: | DCP-LETT-13669 |
