Fish will take both sorts of seeds sent by CD, but will not take oats.

Asks PHG to conduct an experiment to see if young littoral molluscs will cling to a duck’s foot – CD seeks to explain distribution of molluscs without adopting E. Forbes’s [continental extension] theory.

In reply to CD’s query [see 2072], JDD describes what little is known about the crustacea of the Antarctic and southern lands.

Knows of no species of the cold temperate south identical with those of the cold temperate north.

Curative power of hydropathy.

General hairiness of alpine plants questioned: direct environmental effect.

CD has long felt JDH is too hard on bad observers.

His impressions of the hydropathic establishment and E. W. Lane. Is convinced the only thing for "chronic cases" is the water-cure.

Asks if WDF knows of any breed of pig that originated or was modified by a cross with a Chinese or Neapolitan pig, and whether the crossbreed bred true.

Reports long preparation of work on how species and varieties differ. Agreement with Wallace’s conclusions as reported in Annals and Magazine of Natural History and in his letter to CD of 10 0ct [1856]. On distinction between domestic varieties and those in "a state of nature".

On mating of jaguars and leopards, the breeding of poultry, pigeons, etc.

Requests help for his experimenting on means of distribution of organic beings on oceanic islands.

JDH has shaved the hair off the alpine plant.

CD apologises for his criticism.

Apparent but false relations of plant structure to climate: heath-like foliage of all Cape of Good Hope plants.

JDH’s last letter demolishes woolly alpine plant theory.

Correlation of apetalous flowers and cold climate.

Thanks for new part of "Statistics".

Interested in disjoined species; do they tend to belong to large or small genera, and are they generally members of small families?

Is glad AG will tackle introduced plants; has noticed that the proportion of a particular family to the whole flora tends to be similar in introduced and indigenous plants.

Accepts a dozen eggs of rumpless Polands. Having so many enables him to see whether the breed "comes true".

Asks what colour turbits have dark tails – "it is just the class of facts which interest me".

Do fowls when crossed throw odd and unexpected colours like pigeons?

Discusses family health and affairs.

Asks JDH’s opinion, and botanical evidence, on important law: parts that are highly developed in comparison to other allied species are very variable.

Interest in hairiness of alpine plants revived by reading A. Moquin-Tandon [Éléments de tératologie végétale (1841)]; correlation with dryness. CD seeks interpretation independent of direct environmental effect.

Lists pigeons and poultry he is forwarding to WBT.

Wants details of WBT’s Poultry book [1856–7]

and is anxious to purchase his long-winged runt.

Thanks him for help and information on fowl crosses.

Agrees with Thomas Henry Huxley that Albany Hancock has a good claim on a Royal Society medal. Thinks that geology has not been sufficiently honoured by the Royal Society, and suggests Joseph Prestwich. Expresses his strong opinion that Charles Lyell would be a worthy recipient of the Copley Medal.

Thanks him for information concerning Crustacea.

Comments on natural history study in the U. S.

Mentions work done by Huxley on Crustacea ["Description of a new crustacean", J. Geol. Soc. Lond. 13 (1857): 363–9];

John Lubbock on larvae of Diptera.

Is trying to find a tutor for WED.

Birds that have been hybridised.

Writes of WED’s recent excursion to Manchester and his future educational plans.

Comments on species with disjoined ranges; does not feel, despite CD’s expectations, that they tend to belong to small families.

Gives the proportion of U. S. trees in which the sexes are separate [see Natural selection, p. 62].

Qualifications of John Lindley, Huxley, Albany Hancock, Joseph Prestwich, J. C. Ross, and Francis Beaufort for Royal Medal.