Entire family down with influenza. Has done nothing for three weeks.

Asks for Haast reference on New Zealand glacial deposits.

CD’s view of the North since Trent case. Can no longer write with sympathy to Asa Gray.

Encourages JDH about his son, Willy.

Problem of relation of colour to external conditions. Hopes JDH will undertake the investigation.

His answer to Asa Gray.

On JDH’s view of aristocracy. Primogeniture is dreadfully opposed to selection.

Orchid book proofs ready soon – has no idea whether it is worth publishing.

Huxley on Owen.

Feeble letter from J. H. Balfour against Huxley’s lectures ["Relation of man to lower animals", pt 2 of Man’s place in nature (1863)].

Has received the "astounding" Angraecum sesquipedale with nectary 1ft long: "what insect could suck it?"

Is JDH sure it is a Bletia, just received? Its pollen very different from any Epidendreæ he has seen. If it is Bletia, Lindley’s grand divisions are fanciful.

Accepts JDH’s offer to collect cases of dimorphism.

James Bateman has sent a lot of orchids with Angraecum sesquipedale. What a proboscis the moth that sucks its 11½ inch nectary must have!

Thanks JDH for box of melastomes

and a very valuable reference from Daniel Oliver.

Is crossing Monochaetum which he thinks is dimorphic.

Is "sometimes half tempted to give up species & stick to experiments".

Pollen of Bletia hyacinthina is quite unlike other Bletia species but exactly the same as Epipactis.

Asks for the address of C. W. Crocker.

Admires JDH’s paper on Arctic plants ["Distribution of Arctic plants", Trans. Linn. Soc. Lond. 23 (1862): 251–348]. Such papers compel people to reflect on modification of species;

JDH will be driven to a cooled globe.

Serious erratum in paper.

New and original evidence in case of Greenland. Its flora requires accidental means of transport by ice and currents.

[List of plants in CD’s hand, with notes by JDH identifying them.]

CD wishes he could sympathise with Asa Gray’s politics.

Orchids to appear soon.

Pre-glacial Arctic distribution.

Work on floral dimorphism.

High opinion of Buckle as a writer.

Darwin mentions that ARW will soon return from the Malay Archipelago.

Thinks JDH is a bit hard on Asa Gray.

Bates’s letter is that of a true thinker. Asks to see JDH’s to Bates. Point raised in it is most difficult. "There is one clear line of distinction; – when many parts of structure as in woodpecker show distinct adaptation to external bodies, it is preposterous to attribute them to effect of climate etc. – but when a single point, alone, as a hooked seed, it is conceivable that it may thus have arisen." His study of orchids shows nearly all parts of the flower co-adapted for fertilisation by insects and therefore the result of natural selection. Mormodes ignea "is a prodigy of adaptation".

On effect of external conditions: CD thinks all variability due to changes in conditions of life because there is more variability under unnatural domestic conditions than under nature, and changed conditions affect the reproductive organs. But why one seedling out of thousands presents some new character transcends the wildest powers of conjecture.

Not shaken by "saltus" – he had examined all cases of normal structure resembling monstrosities which appear per saltum. Has fought his tendency to attribute too much to natural selection; perhaps he has too much conquered it.

Asks JDH to correct names of two species of Calanthe.

Note from Asa Gray ends "Yours cordially", so CD hopes he is forgiven.

His Catasetum paper will be read 3 Apr [Collected papers 2: 63–70].

Plants and seeds sent will be of great use, especially Lythrum, which according to J. P. E. Vaucher seems grand case of trimorphism. Asks what sort of man Vaucher is.

Both JDH’s and Bates’s letters are excellent. JDH has said all that can be said against direct effect of conditions, but CD still sticks to his own and Bates’s side. CD should have done what JDH suggests (since naturally he is pleased to attribute little to conditions) – viz., started on the fundamental principle that variation is innate and stated that afterwards, perhaps, this principle would be made explicable. Variation will show that "use and disuse" have some effect. Does not believe in perfect reversion. Demurs at JDH’s "centrifugal variation"; the doctrine of the good of diversification amply accounts for variation being centrifugal.

The wonderful mechanism of Mormodes ignea.

On Vanilla.

Asks JDH to observe whether he has both long- and short-styled form of Menyanthes

and whether he has "Saxifrages with long hairs glandular at the tip".

The Linnean Society session made him vomit all night. Fears he must give up trying to read papers or speak. "It is a horrid bore. I can do nothing like other people."

No summary available.

Asks JDH to look at stigma of Leschenaultia biloba; it seems certain there is no stigma within the bud. Case would be important.

Singular case of peculiar structure now remodified into the functional condition of a Campanula.

Sorry to hear of JDH’s household troubles.

Will try to get a couple of flowers of Leschenaultia to send him.

"What a good case that of the Cameroons"; the 4000ft [elevation] is much to CD’s "private satisfaction".

Sends JDH a copy of Orchids.

Yellow anthers of Heterocentron produce on the same plant thrice as many seeds as the crimson anthers. Crimson anther seeds produce dwarf plants, others rise high up. Monochaetum ensiferum facts are still more strange. Wants to investigate the case, and asks for a plant of the Melastomataceae just before flowering.

Has JDH a Rhododendron boothii from Bhutan with pistil bent the wrong way?

Leschenaultia seems very odd. Will try with pollen left on for 48 hours. Illustrates diversity of structures for same purpose.

Bentham’s and Oliver’s good opinion of Orchids is reassuring.

Anxious to experiment on Melastomataceae; thinks it will give important results.

Wants Leschenaultia formosa to try whether viscid outside surface can be fertilised.

Has received Melastoma and Vanilla.

Has seen again the two sets of plants of Heterocentron raised from two lots of pollen from same flower – a marvellous difference in stature.

"But oh Lord what will become of my book on variation: I am involved in a multiplicity of experiments."

Observations on Viola.

CD’s fancied dimorphism of Oxalis is all a confounded mistake; only great variability in length of pistils.

Found Henslow’s life [L. Jenyns, Memoir of the Rev. J. S. Henslow (1862)] interesting but fears the public will think it dull.