Discusses possible case of inherited memory involving Pompilus. Cites similar example of electric eel.

Asks him to visit.

Says it is not likely he will be able to criticise GJR’s work.

Recommends Jean-Henri Fabre, Souvenirs entomologiques [1879].

Encloses letters from J. F. Moulton [12350 and 12356].

On GJR’s work on mental evolution in animals. Emphasises "love" among animals.

Comments on stimulation of plants.

On pleasure and pain.

Comments on hybridisation; cites authorities. Sends book by Wilhelm Olbers Focke [Die Pflanzen-Mischlinge (1881)].

Comments on GJR’s article on hybridisation.

Recommends his article ["Fertility and hybrids from the Chinese and common goose", Collected papers 2: 219–20].

Discusses crosses of Lythrum.

Comments on papers by Francis Darwin.

Suggests methods for growing seedlings for experiments involving light.

Comments on GJR’s observations on monkey.

Describes difficulty of obtaining pigs for experiment.

Has read with interest GJR’s review [of Samuel Butler, Unconscious memory (1880)] in Nature [23 (1880–1): 285–7]. Heroic of GJR to call down [Butler’s] revenge on his own head. Ernst Krause’s letter [Nature 23 (1880–1): 288] very good.

As magistrate, CD must enforce rules regarding infection in pigs.

Thanks GJR for his second letter replying to Butler [Nature 23 (1880–1): 335–6].

Comments on the meaning of his definition of the term, "animal intelligence". Encloses further discussion from his forthcoming book [Earthworms].

Comments on GJR’s view of animal consciousness. Mentions experiment on learning among worms.

Discusses difficulties involved in plant experiment designed to test Pangenesis.

Discusses concept of intelligence in his Earthworms manuscript.

Remarks on GJR’s work on echinoderms.

Comments on Wilhelm Roux [Der Kampf der Theile im Organismus (1881)].

Discusses animal instincts, citing Fabre’s description of sand-wasps.

Discusses GJR’s experiments on heliotropism in plants; views of Philippe van Tieghem and Julius von Wiesner. Describes his own experiments.

Mentions his letter on vivisection [to Frithiof Holmgren, see 13115] in the Times [18 Apr 1881].

Comments on GJR’s letter in the Times [25 Apr 1881] concerning vivisection. Mentions activity of anti-vivisectionists, G. R. Jesse and F. P. Cobbe.

CD is glad the portrait [of CD by John Collier] has been arranged; suggests dates, but feels he should have no say in the subscriptions or remuneration.

Thinks the Lakes are beautiful.

Is reading W. Graham’s The creed of science.

Is returning to Down.

Rejoices that GJR writes so much in Nature.

Encloses notice about Wilhelm Roux’s book [see 13118].

Comments on John Collier’s portrait.

Unable to contribute an essay to a symposium on the subject of vivisection. Objects to use of term "symposium".

Mentions articles of Hermann Müller.

Death of his brother Erasmus [26 Aug 1881].