Sends TCE West African dog’s skin.

CD has saved an enormous amount of labour since he replaced the chain on his deep well with wire rope. He now asks readers whether they have had experience of saving on the weight of the bucket by using some material other than oak.

Arrangements for delivery of pigeons and poultry to Down.

States he has "misgivings about the definiteness of species". Believes there is some inherent tendency for plants to originate varieties. Cross-fertilisation is likely in most cases but sees difficulties with plants like Adlumia.

Important issue at stake with new flora calculations: evidence that species are only strongly marked varieties. Planning large-scale survey.

Thanks for rabbit.

Are there dun-coloured ponies in Shetlands? Are they striped?

Is looking forward to returning home [from Moor Park hydropathic establishment]. News of other patients and the books she is reading. Although feeling well, cannot walk much.

Delighted that JSH is coming to Down. Sends correct train time.

He was unaware that varieties occurred proportionately more in large genera.

Recommends a work [Leonard Gyllenhaal, Insecta Suecica, 4 vols. (1808–27)] for tabulating varieties.

Lists "close geographical representatives of Europaean species" based on the species numbers [in T. V. Wollaston, Catalogue of the coleopterous insects of Madeira (1857)].

Tabulation of varieties goes on; very important as it shows the branching of forms. Mentions his principle of divergence.

Reports progress of work on the new rooms [at Down].

Encloses an abstract of his ideas on natural selection and the principle of divergence; the "means by which nature makes her species".

Discusses varieties and close species in large and small genera, finding some data from AG in conflict with his expectations.

Has been observing the action of bees in fertilising kidney beans and Lobelia.

Some negative results in variety tabulation survey.

Galls on wild carrot.

CD acknowledges honour of his election to the Academy.

Representative species may complicate tabulation of varieties.

Questions for Mr Anderson about horse colouring in Norway.

Has been writing an "audacious little discussion" to show that "organic beings are not perfect, only perfect enough to struggle with their competitors".

Thanks for three last lectures and the account of cirripedes.

Difficulty of classifying the higher groups.

Gives CD further details of the fertility of the offspring from cross of a yak and Indian cow, the so-called chooboos, whose fertility he has traced to the seventh generation [see Natural selection, pp. 437–8].

The returned gloves are similar to some he has already, and he would prefer a pair with stiffer bristles.

Agassiz’s superficiality and wretched reasoning powers. But he stirred up Europe on glaciers. Lyell has been working on their effects – testing work of others.

CD believes "Natural Systems" ought to be simply genealogical. "Time will come when we shall have true genealogical trees of each great kingdom of nature."

On classification and possibilities of a scientific morphology and zoology. CD’s "pedigree business" is important for physiology but has nothing to do with pure zoology any more than human pedigree has to do with the census. Zoological classification is a census of the animal world.