Summary

Raises some points for revision of CD’s Journal of researches.

Southern island floras. "The more I ponder upon Insular Floras the less inclined I am to admit the mutation of species to any very great amount."

Summary

Questions for his lecture on "Insular floras".

Comments on CD’s criticism of Atlantis. Has no fixed opinion on continental extensions. Great objections to hypotheses of CD and Forbes: botanical to CD’s; geological to Forbes’s. Will point out that natural selection is necessary to both hypotheses.

Summary

Responds to CD’s criticisms. JDH is sometimes confused as to what he has borrowed from CD.

Summary

JDH’s aunt cannot find lodgings for CD.

Similarities between floras of Tierra del Fuego, Van Diemen’s Land, and New Zealand; does not feel migration sufficient explanation.

Summary

JDH recommends Augustin de Saint-Hilaire’s Leçons de botanique [1841]. Relates opinions of European botanists on migration and plant distribution.

Summary

Has done Edmondston’s Galapagos plants.

Dispute between Edward Forbes and H. C. Watson.

Summary

Answers CD’s queries arising from Flora Antarctica.

Would like CD to come to town and go over Galapagos plants with him.

Summary

A Tasmanian Cyttaria is same species as CD’s Fuegian fungus. Did the species originate on the beeches of Fuegia or of Tasmania?

JDH gives interpretation of Vestiges.

John McCulloch, J. F. Schouw, and Lamarck on the species question.

Summary

George Bentham’s list of aberrant plant genera. JDH appended the number of species in each genus according to E. G. Steudel’s catalogue [Nomenclator botanicus (1840–1)] and according to JDH and Bentham.

JDH speculates on effect of splitting Australia longitudinally on distribution; it becomes an argument for new creations.

Summary

JDH’s arguments against transmutation: 1. Plants do not show the confusion he would expect; 2. Under clearly similar physical conditions we do not find same species.

JDH’s argument against migration: commonality of alpine species. Believes migration opposes facts of botanical distribution in Van Diemen’s Land and New Zealand; prefers continental extension theory.

Summary

Busy with introductory essay to [The botany of the Antarctic voyage, pt III] Flora Tasmaniae [printed separately as On the flora of Australia (1859)].

Now explains greater abundance of European species in Tasmania than in Fuegia by CD’s "refrigeration" hypothesis.

Summary

Though correspondence has never ebbed so low, CD is constantly in his thoughts.

Observations on cheetahs used as domesticated hunting animals.

Finds geographical barriers sometimes separate species, but also finds species that remain separate where there are no barriers to migration.

Colour "individuates" isolated animal species.

Plains and alpine animal distribution show altitude not strictly analogous to latitude.

Impact of timber cutting on climate has led to extinction of crocodiles.

Will discuss coal formation in letter to Edward Forbes.

CD often asked whether isolated mountains in southern latitudes had closely allied representatives of Arctic and north temperate plants; JDH has found a representative barberry.

Making for Darjeeling via Calcutta.

Summary

Thomas Thomson has gone over Scott’s paper; encloses his conclusions. Not fit for publication in present form. His experiments should have been repeated to resolve his disagreement with Gärtner.

Summary

Has examined Leschenaultia and concludes the external viscid surfaces have nothing to do with the stigmatic surface. Agrees with CD’s style and nectary conclusions; accounts for their form and position in irregular flowers by describing floral development.

[Enclosed are some queries by CD with answers by JDH. Gives information on seed setting by Mucuna

and an opinion on the abruptness of N. and S. limits of plant ranges.]

Summary

JDH prepares Anniversary Address to the Royal Society [Proc. R. Soc. Lond. (1876): 339–62].

Return of Challenger.

Summary

Replies to CD’s queries on climbing plants.

Summary

JDH approves MS section on geographical distribution.

Never felt so shaky about species before.

His objections to some mechanisms of distribution that CD proposes.

Summary

JDH explains why he cannot take Scott on at Kew.

John Tyndall cannot answer CD’s questions on glaciers. Edward Frankland’s ignorance. In JDH’s opinion, heaviness of winter snowfall is the greatest element in size of glaciers and this is a function of low mean temperature. Discusses descent of glaciers.

Summary

James Wilson reports case of salmon hybrids.

Herrings inhabit freshwater lake in Scotland during winter.

JDH will edit juror reports for the Great Exhibition.

Summary

JDH admits he wrote Gardeners’ Chronicle and Natural History Review articles on orchids [Gard. Chron. (1862): 789–90, 863, 910; Nat. Hist. Rev. n.s. 2 (1862): 371–6].

JDH’s objections to CD’s idea of how Greenland was repopulated. Temperate Greenland has as Arctic a flora as Arctic Greenland – a fact of astounding force. Why should certain Scandinavian species be absent? Migration by sea-currents can no more account for the present distribution in Greenland than can special creation.