Sends suggestions for observations on glacial phenomena that might be made on the [Polar] expedition [of H. M. S. Alert and Discovery, 1875–6].

Sends his thoughts on [vivisection] petition. Thinks they might make petition more talked about. Leaves it to J. Paget, Burdon Sanderson, and CD to deal with.

Lord Cardwell thinks it unlikely that Parliament will take any action on a vivisection bill this session. Playfair should be consulted.

E. F. W. Pflüger’s important memoir on how carbonic acid is produced by living matter and his speculation about origin of living matter [see 9931].

Lyon Playfair’s bill [on vivisection] is unacceptable to all teachers of physiology. It prohibits dissections for demonstrations to students. He will have to repudiate it. Asks CD’s advice.

Offers to send Ascidia specimens of Beagle voyage. Describes some of them.

Hopes THH will review his book [Living Cirripedia, vol. 1] which has been published for a year with no notice taken of it except briefly by Dana.

Discusses Limulus-like larva. "I have become a man of one idea.– cirripedes morning & night."

THH’s catalogue [THH and R. Etheridge, A catalogue of the collection of fossils in the Museum of Practical Geology (1865), part published in 1857] best résumé he has seen of science of natural history. On classification he is not quite sure that he wholly goes along with THH. Encloses a few criticisms of THH’s preface.[enclosure survives as copy only].

Invites Mrs Huxley and the children to spend a fortnight at Down.

MS of Chauncey Wright’s review has not yet arrived.

[P.S. missing from original.]

On THH’s Lectures to working men.

Work by Ferdinand J. Cohn on the contractile tissue of plants ["Über contractile Gewebe im Pflanzenreich" Abh. Schlesischen Ges. Vaterl. Cult. 1 (1861)] seems important. CD has come to the conclusion that there must be some substance in plants analogous to the supposed diffused nervous matter in lower animals.

[Part of P.S. missing from original.]

Apologises for passing on what he agrees were offensive remarks in V. Lushington’s letter. Has told VL he had no right to make them. Asks THH to make allowance for red-hot disciples defending the master.

Delighted with THH’s review [in Academy (1869)] of Haeckel’s [Natürliche] Schöpfungsgeschichte [1868],

but groans about THH’s view of rudimentary organs. Cites Origin and Variation.

Affected by THH’s letter – will send a copy to the other 17 friends. Hopes for his and public’s sake his health will improve.

THH sends to AD a draft, prepared by himself and CD, of a statement for a subscription fund to assist AD’s Naples Zoological Station.

CD believes Playfair’s bill would not restrict demonstrations under anaesthetic.

Has received Chauncey Wright’s pamphlet [see 7940].

Has reviewed Quarterly Review article and 2d ed. of Genesis of species for the Contemporary Review [18 (1871): 443–76].

Mivart has hopelessly misunderstood Suarez [Disputiones (1630)] on evolution.

Appreciation of the "marriage gift"; their affection for CD.