Summary

Discusses dimorphism in plants, especially the Rubiaceae.

Gives observations on orchids; notes varying degrees of self-sterility and a varying success at crossing distinct species.

Mentions local ferns he is collecting

and considers the phenomenon of apparently mimetic plants.

Summary

A sermon.

Summary

Begins to hope baby may survive; description of symptoms.

Summary

Encloses observations on Malays who have not had communication with Europeans [in answer to CD’s queries about expression].

Summary

The Cyprinodontidae family of fishes exhibits sexual differences as remarkable as any in reptiles or birds [Descent 2: 7, 9–10].

Summary

Cites cases of difference in coloration between the sexes of some species of Crustacea, annelids, and spiders.

Discusses dimorphic plants and self-sterility.

Outlines some experiments involving the crossing of different species of orchids.

Encloses extract from Carl Claus, Die freilebenden Copepoden [1863].

Summary

ARW responds to CD’s list of queries about expression. Suggests acquiring informants through publishing the queries in newspapers. His doubts about their importance.

Has submitted caterpillar question to Entomological Society.

Summary

Seeks CD’s opinion and references on the causes of terraces in the south of England. He supports sea action as cause, either by currents or on coasts, and has been engaged in a controversy in the Geological Magazine [4 (1867): 571–5] with the subaerial school. Poulett Scrope thinks they are agricultural.

Summary

Sends paper on new species of Bonatea, to which he has given the name Darwinii.

Has now an extensive collection of insects.

Has discovered moths whose larva cases resemble perfectly the thorns of the Acacia horrida.

Has asked for the head of a Bushman murderer. Difficult to convince authorities of interest of science.

Summary

Sends CD cheque for £250, two-thirds of the profits on the sale of 700 copies of Origin, 4th ed.

Hopes he has found a suitable indexer for Variation.

Summary

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.

Summary

Agrees to publish German edition of Variation.

Discusses publication of third German ed. of Origin.

Thanks CD for portrait.

Summary

Asks whether his former pupil, J. J. Moulinié, might translate Variation into French for Reinwald. CV would provide a preface. Encloses letter from Moulinié to Reinwald.

Summary

Has asked a classics scholar about a word for Pangenesis. He suggests "atomogenesis".

Is getting in rather a fright about the coming exams.

Summary

Has distributed CD’s questions on expression. Observations on the natives.

Floral structure encouraging cross-pollination in Polygala.

Summary

Responds to CD’s criticisms. JDH is sometimes confused as to what he has borrowed from CD.

Summary

Sexual ornamentation of insects: coloration of Epicalia genus [of tropical S. American butterflies];

horned genera of lamellicorn beetles [see Descent 1: 370, 388].

Wallace brought CD’s question about gay-coloured caterpillars before the Entomological Society. Members now seeking explanations.