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.

Summary

Will come to visit Kew if Claude Gay speaks English. Otherwise would prefer to wait until spring.

Summary

Will visit JDH in spring.

Will JDH ask Gay what birds, reptiles, or mammifers inhabit Juan Fernández [Island]?

Has JDH seen William Herbert’s paper ["Local habitation and wants of plants", J. Hortic. Soc. Lond. 1 (1846): 44–9]?

Summary

Thinks JDH’s explanation of polymorphism on volcanic islands is probably correct.

Proposes experimental test to see whether alpine form of a plant is inherited like a true variety.

Summary

Has had to make a Post Office order to JDH payable at Charing Cross instead of Kew.

Does Sir William [Hooker] know the Dean of Manchester’s London address?

Summary

Glad to hear of JDH’s botanical appointment [with Geological Survey].

Edward Forbes has written about his subsidence doctrine; CD objects to its hypothetical base.

Summary

Sends enclosure for JDH to read [letter from E. Forbes, 956]. "I cannot see my way about his post-miocene land."