JDH’s contempt for R. I. Murchison.

There is a Cyperus species and a Pteris species endemic to hot volcanoes of Ischia. Why are there no other migrators?

Fossil leaves from Disko Island.

JDH to begin working out the botanical geography of the polar sea.

Has not forgotten CD’s request on aberrant species.

Has taken a house on Richmond Hill.

Sends list of aberrant forms of Curculionidae.

Discusses in detail the artificiality of Carl Johan Schönherr’s classification. Sound generalisations about geographical distribution depend on sound classifications. Warns against putting too much faith in current catalogues.

George Bentham’s list of aberrant plant genera. JDH appended the number of species in each genus according to E. G. Steudel’s catalogue [Nomenclator botanicus (1840–1)] and according to JDH and Bentham.

JDH speculates on effect of splitting Australia longitudinally on distribution; it becomes an argument for new creations.

In response to CD’s query, HCW says he cannot supply "any list of species as the flora of a single and sterile soil". Suggests a possible source of information, and provides some figures for Britain, but these apply to diverse soils.

Sends a count of the number of species of flowering plants and ferns on the islands of Fayal and Flores in the Azores.