Thanks AWM for "Comus" and an abusive New Orleans Mardi Gras newspaper editorial; he cannot tell from the "wonderful mistakes" whether the writer is "witty, ignorant, or blunders for the sake of fun".

JDH identifies, for Lady Hyacinth Jardine [later Hooker], an Epimedium as E. pinnatum & an Elm as an Elaeagnus probably E. hortensis, which is used for making sherbet in the East. Elaegnus odoratus is not a name known to JDH but it could be a newly introduced Japanese species. JDH sends his thanks for some moss, [John] Smith would like some more. He would also like Gualtherias & any Epimedium, Asarum & Sanguinaria to plant out in beds which he will name after Lady Jardine, he also offers greenhouse plants in exchange. He intends to try growing Cyclamen on the terrace by the new range & other similar things that would not ordinarily grow in the Kew soil. A planned trip has been postponed by the illness of Frances Hooker's brother George Henslow who has become paralysed. Frances is not well either & will go to stay with the Darwins. JDH sends his regards to Lady Jardine's husband Sir William. He appears to continue the letter after the signature, addressing Sir William's criticisms of his Flora, which relate to the presence of certain species in various Scottish localities: Erica cinerea in Sutherland, Solanum nigrum at Craigmillar & Epidendrum alpinum in Dumresshire, Hymenophyllum wilsonii in Loch Lomond & Typha angustifolia in Lochmaben.

Sends to Pantlludw [North Wales] bottle of formic acid. FD and Amy [Darwin] can search for spawn. If found, keep in two basins and add 6 drops of acid to one and look for differences.

Thanks CD for his kind letter about The fair haven [1873]. Encouraged by its reception. All he wants is to compel "an attitude of fixed attention in the place of cowardly shrinking from examination". Says he will try "a novel pure and simple with little ""purpose"" next".

Discusses error in CD’s calculation of natural increase of elephants.

Includes extract from Origin.

Sends 15 studies in expression, acted by his wife.

Describes David Ferrier’s experiments on electrical brain stimulation of animals; these show direct relation between convolutions of the brain and groups of muscles [West Riding Asylum Med. Rep. (July 1873)].

"Try only 1 or 2 drops of Formic A[cid]."

It is Huxley’s "duty to do what we wish him to do – his duty to his wife and children, his duty to us and to the world". Shares CD’s wish that Mrs [Henry] L[yell?] had not subscribed – it suggests the idea of an effort.

Thanks LB for his essay on local biology.

CD with much care and discomfort is now able to work a few hours almost every day.

Photographs sent by JC-B show great power of acting.

David Ferrier’s researches sound wonderful. Does he believe that he excites an idea and this leads to the movement, or that he acts directly on the motor nerves?

Fears all the seeds are dead. Will try with less vapour of formic acid.

No summary available.

Thanks for letter and curious photographs. Urges AR not to send anything valuable unless he publishes it elsewhere because CD is growing old and may not have strength and time to continue his former researches.

No summary available.

No summary available.

The Huxley fund amounts to £1955. CD trembles about THH’s answer.

Recipient is to stay with CD;

sender relates some observations of dogs and birds, to be passed on to CD.

No summary available.

Left the Garibaldi at Rio de Janeiro.

Phylogeny of aphids.

Writes of his extreme interest in WBC’s article ["On the hereditary transmission of acquired psychical habits", Contemp. Rev. 21 (1873): 779–95].