No summary available.

On the colours of the nudibranch Mollusca. [See Descent 1: 326.]

Thanks CD for copy of Variation.

Discusses Pangenesis and considers CD’s "gemmules" comparable to his own hypothetical "physiological units" ["On alleged ""spontaneous generation"", and on the hypothesis of physiological units", appendix in The principles of biology, vol. 1 (1864)].

Corrections [incorporated in 2d issue of Variation].

Sends prospectus of forthcoming work by his brother [Henry Trimen] and W. T. Thiselton-Dyer [Flora of Middlesex (1869)]. Hopes CD will subscribe.

On the colours of sexes in Crustacea; the structure of male crabs.

Corrects some facts and gives further information on some points for the 2d ed. of Variation.

Specific distinctions among animals.

Cercopithecus of Africa contrasted with the Cebus of South America.

Notes on domestic fowls and their ancestors.

Slow growth of wild animals compared with domestic varieties.

WSD is delighted to hear that first edition [of Variation] has sold so well.

Has received a cheque from J. Murray for 30 guineas, double what was agreed upon. Sends a postal order for the five guineas CD sent him [see 5788].

Thanks for copy of Variation. Comments on it, especially on Pangenesis.

Variability of sizes and colours in spiders; on proportion of sexes; courtship of spiders.

Discusses [Fritz?] Müller’s confusion about ova and pseudova; JL’s Daphnia paper [Philos. Trans. R. Soc. Lond. 147 (1857): 79–100; see 1979] first demonstrated their structural identity.

Points out a misleading statement in Variation.

CD’s letter encourages Murray to proceed with a new edition of Variation; corrections will cost £176.

First notice has appeared in Pall Mall Gazette [7 (1868): 555].

On blind beetles [see Descent 1: 367].

Development of mandibles in Brentus.

JEG and Nathusius on pigs.

Reference to JEG’s paper on African and Indian cats [Proc. Zool. Soc. Lond. (1867): 258–77, 874–6].

Rejoices over news of Variation sales.

Pall Mall Gazette review [7 (1868): 555, 636, 652] is undoubtedly by G. H. Lewes [see 5951].

Dinner at Lyells’.

Dean Stanley favours a monument to Faraday in Westminster Abbey.

Perceval Wright is back from Seychelles and reports on plants he collected.

Sends photo of four Fuegians, including Jemmy Button’s son.

Reports incident of two wild stallions on the Falklands acting together in an attempt to take a troop of mares from an introduced English horse [see Descent 2: 241].

WSD expresses his willingness to do further translating for CD. Sends terms of remuneration.

Agrees to help determine the sex ratios in domestic animals.

Slashing article on Variation in Athenæum.

Discussion of relationships of various pigs.

Encloses information on sex ratios in thoroughbred horses.