To J. D. Hooker 9 February [1858]
Summary
Six volumes of Candolle’s Prodromus confirm rule that small genera vary less than large. Labiatae an exception to rule.
| Author: | Charles Robert Darwin |
| Addressee: | Joseph Dalton Hooker |
| Date: | 9 Feb [1858] |
| Classmark: | DAR 114: 223 |
| Letter no: | DCP-LETT-2212 |
