Is working on sexual selection and is interested in any anomalous sex ratios in lower animals and any sex-related characters.

CD arranging for a translation of FM’s Für Darwin by W. S. Dallas.

Movement in plants.

Dimorphism.

Would welcome FM’s opinion of Pangenesis.

Is glad FM approves of a translation of Für Darwin.

Hopes FM will think well of Pangenesis.

Sexual differences in insect auditory and stridulating organs.

Read FM’s paper on Balanus with great interest ["On Balanus armatus", Ann. & Mag. Nat. Hist. 4th ser. 1 (1868): 393–412].

FM’s additions for English edition [1869] of Für Darwin.

Dimorphic plants.

Delay in translating Für Darwin.

Comments on plan to repeat CD’s experiments on illegitimate offspring.

FM’s observations on stridulation.

Translation of Für Darwin has been published [Facts and arguments for Darwin (1869)].

Discusses dimorphic plants, commenting on FM’s observations on Oxalis.

Is greatly interested in Eschscholzia, which seems somewhat more self-sterile in Brazil than in England.

Thinks FM’s grass is "most wonderful".

On English edition of Für Darwin; CD’s gratitude and admiration.

Reports reviews of Facts and arguments for Darwin [1869].

Is preparing for a French translation of Orchids.

The case of Abutilon which is sterile with some individuals is remarkable.

Has sent FM’s account of the monstrous Begonia to the Linnean Society.

Wants observations on a Papilio to see whether ticking noise is confined to one sex.

Experiments on self-sterility.

Will send copy of his orchid paper ["Fertilisation of orchids", Collected papers 2: 138–56].

Eschscholzia when self-fertilised, produced pods.

Role of humming-birds in plant fertilisation.

Alexander Agassiz has visited Down.

Sales of Facts and arguments for Darwin.

Encloses copy of T. H. Farrer letter [7015] and observations on the self-sterility of Eschscholzia.

Thanks CD for his paper on climbing plants. Lists the many genera that he has found in his area in a short period since reading CD’s paper. [See 4881.]

FM’s comments on Climbing Plants.

Hopes CD has received his letter of 12 August.

Sends some new observations on climbing plants. [The observations are part of "Notes on some of the climbing-plants, near Desterro, in South Brazil", J. Linn. Soc. (Bot.) 9 (1867): 344–9.]

Thanks CD for his photograph.

Sends a paper ["Über das Holz einiger um Desterro wachsender Kletterpflanzen", Botanische Zeitung 24 (1866): 57–60, 65–9].

Believes species of sponge with different mineral spiculae are descended from a form with organic spiculae.

Reports observations on motions of Linum stalks following the sun.

Regards Anelasma as a connecting form between cirripedes and Rhizocephala.

Thanks CD for the copy of Orchids and papers on Linum and Lythrum [Collected papers 2: 93–105; 106–31].

Intends to travel to the River Itajahy and will make observations on climbing plants. Is not sure whether Dalbergia is a winding plant.

CD has changed FM’s whole perception of nature.

CD has helped him to understand distribution of coastal flora.

The vegetation on Desterro is changing.

Louis Agassiz is seeking evidence against transmutation in the distribution of the fish in the Amazon.

Thanks CD for Journal of researches.

Insect genus Elater is an exception to the rule that all luminous organs give out a green light.

Gives some observations on climbing plants at Itajahy.

His study of orchids has convinced him of the value of CD’s book.

Thanks CD for German translation of Origin.

Droughts over the summers have brought about changes in the numbers of plants and animals in the area. The small quantity of Orchestia darwinii that has survived the changes no longer includes two previously common male forms. Great changes also take place without such unusual physical conditions. The disappearance of a briefly abundant bryozoan in local caves has made way not for the return of original bryozoan inhabitants but for a completely new fauna.

Gives some observations on orchids and on some plants which seem to be dichogamous.

Discusses dimorphism of Oxalis; one form has 99% sterile anthers. Has found three kinds of fertile anthers.