Sends his paper on "Willow-galls" [Proc. Entomol. Soc. Philadelphia 3 (1864): 543–644].

Lengthy criticism of Agassiz’s views on species as stated in his Essay on classification [1857].

Interested by CD’s trimorphism in Lythrum. Thinks some great mystery may lie in the fact that in some genera, some species are tri-, some di-, and some monomorphic, and in other genera, Apis, Vespa, Bombus, all the known species are dimorphic.

Requests a postponement of payment on a note for £100.

Thanks CD for his consideration in meeting his convenience respecting the payment of the £100.

Admires Origin, but CD does not consider hereditary law of use and disuse.

Thomas Thomson has gone over Scott’s paper; encloses his conclusions. Not fit for publication in present form. His experiments should have been repeated to resolve his disagreement with Gärtner.

Will return page on pigeons.

Has concluded his crossing experiments and found no trace of hybrid sterility or loss of fertility.

The Field is publishing a series of papers on different pigeon varieties [24 (1864): 366, 395, 459; 25 (1865): 115, 139, 155, 228, 258].

Introduces Cholmondely Pennell of the Admiralty, who wants to speak to CD about a literary matter.

CD’s statement in Origin that clover is utterly dependent on humble-bee for fertilisation has been questioned by his friend’s evidence of visits by other insects. Asks CD’s opinion.

Expresses pleasure at signs of CD’s recovery.

HWB’s work on the identification of species of the genus Colobthea; relates the large number of modifications that occur in the sexual organs of closely allied species. Does not doubt that this contributes greatly to multiplication of species in nature.

JL’s MS at printer’s [Prehistoric times (1865)].

Apologises for failure to post letter.

Thanks CD for subscribing to the Cybele Hibernica.

Reports some observations made on the common buffaloes of India seen swimming and diving in 12ft of floodwater in order to crop the herbage beneath.

Sends copies of the Field containing all the pigeon articles [see 4785].

Luke Wells will undertake engravings for Variation.

University has at last provided room for a small zoological museum. The Philosophical Society might donate its collections to it, including CD’s fishes.

WBT’s eye is getting on very well.

Enclosure comments on a note to folio 1 [of CD’s MS on variation], WBT thinks his works not worth citing: his edition of the Poultry book was never completed and Profitable poultry is out of print.

He encloses a portrait and asks for one of CD.

He has sent mimetic paper to B. D. Walsh.

Mentions work at Royal Geographical Society on N. Pole business [plans for an Arctic expedition, eventually postponed until 1875–6].

It is Bos arni which dives for herbage and in so doing it also swallows many freshwater shrimps.