HCW is trying to define what CD means by "variable" genera.

Describes problems of classifying species in highly variable genera. Lists highly variable genera. Comments on the list of Asa Gray. Says species may be made to appear more or less variable according to whether a genus is divided into few or many species.

Sends a reference to Subularia which bears on a query CD made some time ago [see 2002]. Subularia was seen to flower in the air in a remarkably dry season.

Will shortly return CD’s list of varieties of British plants. Discusses the situations in which different varieties of species are often found and the ranges of varieties relative to those of the species.

Finds he cannot annotate CD’s list of subspecies and varieties as wanted. Mentions again his difficulties with "species"; he "cannot find the proof of species being definite and immutable whatever they may seem to be at any one time and spot".

Discusses the ranges and distribution of varieties relative to the type species.

Believes that botanists tend to mark more varieties in large than in small genera, but notes that where many varieties of a species exist these varieties may well be passed over, whereas similar varieties of another species which are fewer in number may well be recorded.

Discusses the ranges of species in large and small genera; difficulties involved in limiting the discussion to Britain.

Believes natural selection will become recognised as an established truth in science, though it will shock the ideas of many men.

Sends a correction for Origin reprint.

Notes by HCW on the Origin dealing especially with divergence and convergence. Believes there is some natural tendency to converge into groups in opposition to divergence generated by natural selection.

Returns reviews of Origin.

F. J. Pictet [Arch. Sci. Phys. & Nat. n.s. 7 (1860): 231–55] goes further than he himself realises.

Naturalists will resist CD’s views until faith in certain "impassable" barriers between existent species is shaken.

Gives CD an instance of convergence.

HCW thanks GG for responding so promptly to CD’s application for assistance.

Wonders whether natural selection can operate to the extent CD contends.

Comments on the travels of JDH.

Genera plantarum a most worthy undertaking.

Criticisms of the Darwin–Hooker understanding of HCW’s views of convergence.

Regrets he cannot assist the fulfilment of CD’s request for a specimen of the orchid Corallorhiza.

Asks whether one of Balfour’s students could obtain specimens of Corallorhiza from Ravelrig bog outside Edinburgh for CD.

Distribution of varieties and subspecies.

George Maw’s review of the Origin [Zoologist 19 (1861): 7577–611].

The Primula experiments of J. Sidebotham; HCW’s distrust of the results [see J. Sidebotham, "Specific identity of the cowslip and the primrose", Phytologist 3 (1849): 703–5].

Taeas [?] allied to L. hyssopifolia. [Cover containing packets of seed specimens.] Mentioned in the letter to H. C. Watson, 28 May [1864], f.2 (fS 4512).

HCW’s criticisms of CD’s theory.