Reports results of experiments comparing digestibility of gluten and fibrin for CD’s work on Drosera.

Encloses letter and sketch from O. N. Rood on pointed ears.

Reports observations on Sarracenia variolaris. A correspondent finds that the fluid in the pitchers is anaesthetic and that a sweet trail runs down the plant, nearly to the ground, to lure up ants.

Encloses two articles on insectivorous plants [Nation 18 (1874): 216–17, 232–4].

Encloses notes concerning his life and list of publications.

Returns the letters about primroses: they contain little that is new. Dr Bree’s is the best.

Bernard Quaritch interested in reprinting Primitive marriage.

Discusses digestion by insectivorous plants, asks JSBS to try same experiments using pepsin as the digestive agent to see how the results compare with CD’s observations on digestive power of Drosera.

Requests sewage water (and oleic acid) for experiments to determine sensitivity of leaves [of Drosera].

Reports on his examination of the effects of Drosera secretion on tooth enamel and dentine, and of artificial gastric juice on fibrous basis of bone.

Will look for letters from JH in RG's father's papers.

JDH expects Smith has already told Thiselton-Dyer of his 'insouciance' respecting Nice. Thanks Thiselton-Dyer for correcting his [Kew Annual?] Report, he suspects the mistakes were in the record of garden arrivals as [Daniel] Oliver prepares the herbarium records & [John Reader] Jackson the museum acquisitions. He will consider Thiselton-Dyer's suggestion that [George] Nicholson prepare the garden records, as he considers him very able & thinks Smith should make more use of his talents. Mentions that Decaisne gave him Brouquarts'[?] Setewale [Curcuma zedoaria] of Carruthers. JDH will not reply to Miss Booth's letter yet as he wants to avoid visiting her in Lyons, they are trying to keep her father's botanical books together. Tells Thiselton-Dyer not to spend too long on JDH's [Royal Society Presidential?] address. Proposes that the paper on Nepenthes be a joint effort. Agrees with Thiselton-Dyer view on physiological research. Is anxious to read Sachs[?]. JDH calls Florence 'glorious'. The Horticultural Show & Botanical Congress are 'fiascos'. Filippo Parlatore is ill with whopping cough so JDH was made chair of the first session in his place, it should have been George Bentham. Lists some of the attendants. Mentions Carnel brought his Cynomoria to the congress & [Andrei Sergeyevich] Famintsyn read a paper on Myxogasters. Next JDH, Mrs [Frances] Hooker & Huxley go to Venice, then home via Munich. Allman is in Florence but will return in time for the first meeting of the Linnean Society in June.

No summary available.

Thanks him for copy of book [Der Kampf um’s Dasein am Himmel (1874)].

Sends the 1872 Report of the U. S. Geological Survey of the Territories, for which he was zoologist.

Most American naturalists support CD. His study of ornithology convinced him.

Lepus bairdii has a distribution limited to Yellowstone Lake.

No doubt CD knows of O. C. Marsh’s horse fossils.

JDH thanks Sir William Turner Thiselton-Dyer [WTTD] for his letter with news of the loss of the ship 'Liberia', on which their friends the Lowes were passengers. Richard Thomas Lowe's death means the Flora of Madeira will never be finished, like so many other systematic works of botany. In Filippo Parlatore's absence from the Botanical Congress, in Florence, JDH was elected to act as President. He describes how he went about organising & chairing the proceedings of the Congress. He mentions the following papers that were given: one on the Colchicaceae of Greece, [Andrei Sergeyevich] Famintsyn[?] on Myxogasters, Caruel on Cynomorium from Sardinia, Schimper on Astrophyllites from the gneiss quarries of Mont Blanc. JDH had to comment on the papers in his poor French which annoyed some attendees. A bust of [Philip Barker] Webb was invested. JDH & the Vice Presidents had an audience with the King of Italy [Victor Emmanuel II], who JDH calls 'repulsive'. JDH is now in Venice & will return home via Paris. [John] Ball & [George] Allman stayed on in Florence, but the latter must return home soon for his election to the Presidency of the Linnean Society. JDH informs WTTD that he is happy to be a President of the British Association [for the Advancement of Science] meeting but will be satisfied if he only presents the joint paper on Nepenthes. JDH & party are well, except for [George] Bentham who has had diarrhoea. JDH briefly had a cough but has recovered. Mr Harvey is also in Venice.

Thanks for the sewage water and the oleic acid. The former does not seem to act.

Sends Edinburgh address so he may be sent sheets of Descent [2d English, for 3d German ed.].

Has a large class for his lectures.

Comments on his examination of slides [of milk casein?] sent by CD.

Surprised by CD’s finding that a drop of one per cent hydrochloric acid stops digestion of albumen by Drosera.

Descent [2d English ed.] will not be published until November. Will send JVC first sheet of revised proofs soon.

Pleased to hear of success of JVC’s lectures.

Summer plans have changed. Does not yet know when he will take a month’s holiday.

Sends his paper ["On secondary sexual characters in the Cheiroptera", Proc. Zool. Soc. Lond. (1873): 241–52]

and some of his observations of the gecko, which appear to contradict CD’s opinion.

"With kind regards, & many thanks for Prof. Steenstrup’s Photograph, which is most highly valued by C. Darwin"

Sends CD photograph of a "natural curiosity", a bear apparently "painted" with red iron on the face of a soft rock; has also sent copies to a few U. S. scientists.