Thanks CL for Hooker’s letter.

Discussion of Hooker’s views on glacial action and temperature with specific reference to S. America.

His squabbles with Hooker on transport of seeds via water currents,

temperate plants, and preservation of tropical plants during cooler period.

Expresses interest in seeing Agassiz’s letter.

Going to Orient as naturalist aboard the Rifleman. Offers CD his services.

Is sending Ophrys plants marked as CD requested as wild or under cultivation. Discusses arrangements for a scheme planned for 1867 and his method for marking his Ophrys specimens.

Regrets that his health prevents their meeting, but offers some suggestions for the expedition to the Malay Archipelago and coast of China: the search of caverns in the Malay Archipelago for fossil bones, deep sea dredging in the tropics, glacial action in any moderately steep mountains, means of geographical distribution, the history of domestic animals in these regions, and gestures and expressions of real savages as compared with our civilised expressions. [See 5008 and 5011.]

Suggests two ways of financing what Susan will owe Catherine’s estate.

Division of Catherine’s estate.

Arrangements for EAD’s will.

Wishes CD would pay him another visit.

Thanks for CD’s suggestions. [From CD’s notes on CC’s previous letter, these were (1) means of distribution; (2) domestic animals; (3) gestures of savages.]

Discusses CD’s and J. D. Hooker’s letters to Lyell concerning Louis Agassiz’s theory of the glaciation of the Amazon basin in Brazil.

Requests copy of paper read at Amsterdam Horticultural Congress, on graft-hybrids like that of Cytisus adami [see 5018].

Had Busks and Lyells to dinner.

Examines and criticises evidence for CD’s hypothesis that the glacial period was not one of universal cold. Physicists deny its possibility.

Informs CD third edition of Origin is exhausted. Proposes a new edition. Has CD any changes? Since demand is slowing up, proposes printing only 1250 copies and deferring payment of CD’s share until sales have repaid manufacturing costs.

Comments on errors [in Origin] pointed out in C. J. F. Bunbury’s letters.

Mentions CD’s notes on Drimys, Fuchsia, and fossil mammals of Brazilian caves.

Sorrowful that his work must be put aside because Murray wants a new [4th] edition of Origin. Remarks on changes to be made regarding Organ Mountains and Agassiz’s glacial markings.

CD is pleased [about need for a new edition of Origin] but even more grieved – for it will delay his next book [Variation]. Progress of natural history will make many changes necessary in Origin. Nevertheless, proceeds with 32 more woodcuts for Variation.

Lyell wants to see JDH’s last letter [the part on glacial periods]. Lyell full of concern about astronomical causes of heat and cold on the globe.

Encloses letter from John Scott.

Sends papers on graft-hybrids ["Sur les hybrides obtenus par la greffe", Bull. Congr. Int. Bot. & Hortic. Amsterdam (1865): 65–80, and "Über Mischlinge, durch Pfropfen entstanden", Sitzungsber. K. Phys.-oekon. Ges. Königsberg 6 (1865): 11–21].

Refers to part of JDH letter on glacial period sent on to Lyell. CD will not yield. Cannot think how JDH attaches so much attention to physicists. Has "come not to care at all for general beliefs without the special facts".

His health is improved but not so good as JDH supposes.

Has received the larva of the batrachian. Outlines its affinities. Problems of batrachian systematics.

William asks what to do about a complication in settling Aunt Catherine’s estate.

As Honorary Secretary of the Botanical Congress he asks that CD’s name be listed as a member of its committee.

Discusses the stinging habits of wasps and bees and whether or not they leave their sting in the wound.