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From Asa Gray [c. 24 May 1857]
Summary
Discusses difficulties involved in deciding which genera are protean in the light of some comments by H. C. Watson.
| Author: | Asa Gray |
| Addressee: | Charles Robert Darwin |
| Date: | [c. 24 May 1857] |
| Classmark: | DAR 165: 97 |
| Letter no: | DCP-LETT-2104 |
