To J. D. Hooker 1 August [1857]
Summary
Important issue at stake with new flora calculations: evidence that species are only strongly marked varieties. Planning large-scale survey.
| Author: | Charles Robert Darwin |
| Addressee: | Joseph Dalton Hooker |
| Date: | 1 Aug [1857] |
| Classmark: | DAR 114: 206, 207 |
| Letter no: | DCP-LETT-2130 |
