Asks GHD whether he can tell him what inclination a polished or waxy leaf ought to hold to the horizon in order to let vertical rain rebound off as much as possible.

CD gives his criticisms of GHD’s essay on religion and the moral sense. Urges him to delay publishing for some months and then to consider whether it is new and important enough to counterbalance the effects of its publication. J. S. Mill would never have influenced the age as he has done had he not refrained from expressing his religious convictions. Cites John Morley’s Life of Voltaire [1872]: direct attacks produce little effect; real good comes from slow and silent side attacks. "My advice is to pause, pause, pause."

"It is a fearfully difficult moral problem about speaking out on religion, & I have never been able to make up my mind."

An Irishman, a "grand breeder" of short-horns, declared at lunch that CD’s books had been "a great help to [him] in breeding!"

CD writes about organising a subscription for Dohrn’s Zoological Station at Naples. Has drawn up a draft circular for naturalists to sign to show their support for the Station.

Sorry to hear of GHD’s poor health – he could have pleasant society at Cambridge if he were stronger.

Contributes £75 [to a fund for Naples Zoological Station] "if the affair goes on after we hear from Dohrn".

CD is looking for editorial assistance in preparing a new edition of Descent, and inquires whether GHD might be interested in taking on such a tedious job.

Pleased that GHD will help with second edition of Descent. Cautions him not to alter strength of CD’s expression or improve the style too much.

Regrets the trouble GHD has had.

Is sorry to hear the news about the cousin question – a real misfortune.

Congratulates GHD on being nearly finished with work on Descent.

GHD’s corrections seem very good. Murray hopes there will be few corrections in Descent. CD assured him no changes have been made merely for improving style.

Wants very much to hear about "the terrible cousin affair".

D. A. Spalding has asked for information to help with his experiments on sense of direction in animals. Has arrived at same results as GHD with blindfolded children. Will GHD let him have his results?

CD has forwarded proofs of Descent [2d edition]. Urges GHD not to work on them if his poor health makes them too tiring.

Thanks GHD about Spalding [i.e., for responding to Spalding’s request, see 9472].

Comments on GHD’s paper ["Marriages between first cousins in England and their effects", Fortn. Rev. n.s. 18 (1875): 22–41]. Hopes it will be published and read at the Statistical Society.

Advises GHD to get an eminent counsel. If counsel’s opinion is that the reviewer [Mivart, in "Primitive man", Q. Rev. 137 (1874): 40–77] has falsified GHD’s statements, GHD should send the opinion to the Quarterly Review and demand publication, and if refused publish elsewhere. Then CD must decide whether to cut John Murray [publisher of Q. Rev.] which will put CD in a nice perplexity [over his rights to the stereotyped editions of past works].

Hasty note to express his most decided opinion that letter [to Q. Rev.] should not give a sketch of GHD’s essay – only an explicit denial "& do not allude to me".

GHD’s article will not do. It is too long and the denial seems weak and confused; also, it ought to be in the form of a letter to the editor. Encloses draft of the sort of letter of denial he thinks GHD should write.

Has no objection to sending GHD’s letter as it is. The only accusation it seems necessary to rebut is about licentiousness. Regrets this is not made more prominent.

Gives some suggestions for GHD’s reply to Mivart’s attack.

Approves of GHD’s letter [to Q. Rev. 137 (1874): 587–9] and his present plan, which removes all CD’s objections. Will make his own letter to Murray less imperious. "It will be a dreadful evil to me, if … we come to a quarrel."

Advice to GHD on whether to accept invitation to lecture at the Royal Institution.

Murray has sent the Quarterly Review issue. CD has told Murray that he is convinced Mivart is the author and what he thinks of him.

Sends index [of Descent, 2d ed.] with instructions for proof-reading.

Asks GHD questions about heat transmission; he wants to use it as an analogy to illustrate transmission of motor impulses through leaves of Dionaea.