The Origin converted him from a Linnean interpretation of flowers and mosses.

Glad that CD appreciates his continuing work on mosses, in support of natural selection.

Plans to repeat CD’s orchid experiments.

Sends interpretation of the floral anatomy of Lopezia miniata.

Thanks for "Climbing plants" offprint and for references on fertilisation of flowers.

Considering the bounty of work already done, he is looking for something original to do.

Subularia does not grow in Westphalia.

Thanks for German version of Origin [1867].

Dipterous insects are adapted to eating pollen rather than only to sucking nectar. He describes such adaptations in two dipteran species.

Thanks CD for his photograph.

Intends to start experimenting with mosses to determine which differences in structure are effected by altered conditions of life.

HM is certain his brother Fritz would like to see Für Darwin translated into English by Dallas. He will make arrangements with the German publisher.

Two friends are writing Darwinian works: Adolf Speyer on phylogeny of Lepidoptera

and August Röse on genealogy of mosses.

Has heard from W. Engelmann of Leipzig; he is willing to let CD have the woodcuts to Fritz Müller’s work [Für Darwin (1864)] for 22 thalers.

Thanks CD for the English edition of his brother’s book [Fritz Müller, Facts and arguments for Darwin (1869)]

and for CD’s memoir on orchids ["Fertilization of orchids", Collected papers 2: 138–56].

Would like Frederick Smith of the British Museum to determine whether or not some unidentified Westphalian bees are new species.

HM intends studying bees to find evidence supporting CD’s theories. His work has shown him there are problems in separating species from varieties, and has also revealed many surprising instances of variation in habits.

Is preparing a work on fertilisation of flowers, and wants to add a list of works containing observations on cross-fertilisation of plants. Asks CD for any references he may have.

Thanks CD for MS on the routes of male bees.

His "Fertilisation of flowers" is complete [Die Befruchtung der Blumen (1873)].

Sends his book [Die Befruchtung der Blumen (1873)]. Hopes CD will publish an opinion of it.

Thanks for CD’s praise of his book [see 8901].

Praises Expression.

Reports on Fritz Müller’s observations of cross- and self-fertilisation. HM will cultivate the two forms [i.e., mainly self-fertilised and mainly cross-fertilised] in the way CD has described.

He continues his observation of wild flowers. Encloses drawing of Viola tricolor with notes on its self-fertility.

Poa annua shows putative evidence of nectar secretion in grasses. He will continue observations as CD requests.

Reports on insects fertilising Viola tricolor and on the fertilisation of the two wild forms [see Cross and self-fertilisation, p. 124 n., 125].

Sends a note on R. Caspary’s observations of Corydalis self-fertilisation [see Cross and self-fertilisation, p. 331].

Has begun his experiments on the self- and cross-fertilised flowers.

Fritz Müller is now working on the Brazilian honey-bees (Melipona and Trigona).

HM thanks CD for fertilisation references.

Feels CD’s and Fritz Müller’s judgments on his "Anwendung" essay [see 8313] are of highest value. Mentions some of FM’s comments.

Looks forward to second English edition of Descent.

Thanks for Insectivorous plants.

Believes Lepidoptera are of greater importance as fertilisers in alpine regions than in lowlands.

The famous stone pits of Ohningen are for sale.