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From Alexander Agassiz 4 March 1872
Summary
Thanks for new [6th] edition of Origin.
Is working on Echini.
The more material he gets the less easy it is to diagnose a genus or species. Has little doubt that "classification is nothing but the most arbitrary convenient tool, depending upon the material at our command at a special time".
| Author: | Alexander Agassiz |
| Addressee: | Charles Robert Darwin |
| Date: | 4 Mar 1872 |
| Classmark: | G. R. Agassiz ed. 1913, p. 119 |
| Letter no: | DCP-LETT-8236 |
