From J. D. Hooker 1 February 1846
Summary
Goes on the assumption that each species has one origin, is immutable, and migrates.
Disagrees with Gaudichaud[-Beaupré] that volcanic island species are polymorphous.
Some mundane genera vary, others do not (Senecio vs Gnaphalium).
John Lindley’s doctrine of longevity of trees is amazing.
Edward Forbes’s health is better.
| Author: | Joseph Dalton Hooker |
| Addressee: | Charles Robert Darwin |
| Date: | 1 Feb 1846 |
| Classmark: | DAR 100: 60–2 |
| Letter no: | DCP-LETT-947 |
