Has read and admires FM’s work on species.

Observations on Crustacea are good and original; asks FM to dissect and check some of CD’s observations on cirripedes.

Has sent "Climbing plants" paper [J. Proc. Linn. Soc. Lond. 9 (1865): 1–118] and would like to send Orchids.

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 for interesting letter on climbing plants.

FM’s view on Anelasma seems probable.

Difficulty quoted by FM from A. Agassiz on embryology of Echinodermata is quite beyond CD.

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.

Is sending FM’s two letters on climbing plants as a paper to the Linnean Society ["Notes on some of the climbing plants near Desterro, in south Brazil", J. Proc. Linn. Soc. Lond. (Bot.) 9 (1867): 344–9].

Adaptations for pollination in Catasetum.

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.

Has forwarded FM’s MS to Max Schultze, but did not read it.

Movement of stem apex in Linum.

Haeckel’s paper on reproduction in certain Medusae.

Has read FM’s paper on sponges ["Über Darwinella aurea", Arch. Miskrosk. Anat. 1 (1865): 344–53] with interest.

Has also read FM’s work on the metamorphoses of Peneus [Ann. & Mag. Nat. Hist. 3d ser. 14 (1864): 104–15], an interesting and important embryological discovery.

CD regards Louis Agassiz’s opinions as valueless.

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.

Structure of Scaevola and its fertilisation with insect aid.

Fertilisation of Aristolochia.

FM’s paper on climbing plants [see 5146].

Is preparing new edition of Origin.

Thanks for information on orchids

and facts on coastal flora and fauna.

Asks FM to look out for dimorphic aquatic and marsh plants.

Has read pamphlets "in our favour" by Carl v. Nägeli and Oscar Schmidt.

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

Thanks for observations on orchids.

FM’s paper on climbing plants [see 5146]; CD has received proofs.

Carl Claus’s pamphlet on copepods [Die Copepodenfauna von Nizza (1866)].

Fertilisation in orchids: Friedrich Hildebrand’s paper.

Self-sterility.

Climbing plants.

Agassiz’s attempts to eliminate all Darwinian views.

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

Sends his observations on sterility of Eschscholzia,

on Oxalis,

and on recently found dimorphic plants.

Sends specimen of Hedyotis [see Forms of flowers, p. 133].

Gives observations on orchid ovules ripening long after blooming.

Infertility with own pollen sometimes does and sometimes does not indicate dimorphism; gives observations on Ximenia, Eschscholtzia and Oncidium flexuosum.

Describes some striking seeds eaten by birds,

and some new dimorphic species.

Variation in Thillia.

Confirms CD’s suspicion that the lancet-fish [Amphioxus] lives in competition with invertebrates: it shares its habitat with a similar-looking Ophelia, which is quite unlike other annelids, just as the lancet-fish is unlike other fishes.