Summary

Comments on JDH’s list – very good, but Orchids and Primula paper have too indirect a bearing to be worth mentioning. The Eozoon is a very important fact and to a much lesser degree the Archaeopteryx. Müller’s Für Darwin [1864] perhaps the most important contribution.

CD has forgotten to mention Bates on variation and JDH’s Arctic paper ["Distribution of Arctic plants", Trans. Linn. Soc. Lond. 23 (1862): 251–348] in new edition of Origin.

Now finds that Owen claims to be originator of natural selection.

Summary

Outlines address to York BAAS meeting on history of geographical distribution. Organising theme: advancement in this science based on ideas enunciated by scientific voyagers. Asks CD’s advice.

Summary

Replies at length to JDH’s worried reaction to his comments on lowness of Australian plants. CD distinguishes between "competitive highness", i.e., which fauna would be exterminated and which survive if two faunas were placed in competition, and ordinary "highness" of classification.

Summary

Cannot come to Down to meet B. J. Sulivan as W. H. Harvey is calling.

Plant distribution and soil nature.

Forbes’s modification of Watson’s types of vegetation.

JDH will write comparison of representative plant species of the N. and S. Hemispheres.

Summary

Does not share CD’s objection to continental extension, i.e., that it must be extended to every island in every ocean.

Sends paper on domesticated animals by Brian Hodgson [J. Asiat. Soc. Bengal 16 (1847): 1003–26].

Summary

Congratulates JDH on finishing his introductory essay [to Flora Tasmaniae].

Lyell’s position on mutability appears more positive in his letters to JDH than in those to CD. Considers JDH a convert.

Summary

Tendril-bearing plants seem to CD "higher" organised with respect to adaptive sensibility than lower animals.

Wishes to encourage John Scott.

Death of JDH’s daughter makes CD cry over his own dead daughter Annie.

Sedgwick’s scientific merit.

Summary

Admires Wallace’s Island life.

Criticises: 1. His view of similar plants on distant mountains – CD prefers previous low-land connections to Wallace’s summit–summit dispersal;

2. Source of warmth for ancient Arctic climate;

3. Origin of S. Australian flora.

CD’s favourite cases in Movement in plants.

Summary

Responds to JDH’s outline history of plant geography.

Considers Humboldt the "greatest scientific traveller who ever lived".

Discusses the origin and rapid radiation of angiosperms in Cretaceous period.

Comments on importance of work of Alphonse de Candolle, Saporta, Axel Blytt.