Relieved by Wallace’s letter.

At work on introductory essay to Flora Tasmaniae.

European plants naturalised in Australia are almost all adapted to invading disturbed ground.

JDH supports Asa Gray against Alphonse de Candolle as foreign member of Royal Society.

Outlines the basic categories of phanerogams.

Places Gymnospermae in the dicotyledons.

Evaluates the variable utility of embryological characters in plant classification.

Lyell has been strongly urging John Murray to publish CD’s book [Origin]. JDH feels Lyell overestimates the public interest in such works.

Gives examples of plants showing most marked varieties on the edge of their range.

JDH’s congratulations on Origin.

Lyell believes S. P. Woodward wrote review in Athenæum.

Lyell’s and Huxley’s positive responses.

JDH has only plunged into a few chapters.

JDH half through Origin. High praise for facts and reasoning.

Lyell told JDH his criticisms: small matters JDH did not appreciate.

Reactions of G. Bentham, J. S. Henslow, and C. C. Babington.

Forwards letter from Asa Gray.

Bentham is very agitated by Origin. CD over-emphasises natural selection. His theory accounts for too much and would be improved by unburdening it of natural selection.

Charles Darwin [CD] has not been absent from JDH's thoughts during the long break in their correspondence. He probably spoke too strongly about CD's species work & barnacles. speculates that CD was once prone to theoretical considerations about species & unaware of certain difficulties which JDH thought a more intimate acquaintance with species might clear up. Hence was pleased CD took up a difficult group like barnacles. CD's theories have progressed but JDH is not converted. He thought the transitions from one form to another in Sikkim would be more apparent. CD reasons rightly about JDH's Yangma valley; it is undoubtedly a vast moraine. He rejects the Himalayas as an independent chain of mountains & seeks the axis of the great mountain system between the Yarou river & the plains of India. He considers the glaciers of the Himalayan range unrivalled & is convinced they are receding. Explains that it is a double chain likes CD's Andes. [Thomas] Thomson [TT] & [Hugh] Falconer [HF] both regard the greatest Asiatic axis as a sub meridional one. The whole mountain system is incredibly complicated & he exceedingly doubt's Humboldt's system of six Mountain chains. Letter continues under date of 7 Apr. JDH now with HF at Honorable East India Company Botanic Gardens. HF had kept all his letters & overland parcels for five months due to insane procrastination but is now forgiven. HF's society is as ever delightful. HF no longer associates with the Asiatic Society. JDH received CD's Feb letter today & learned that the cold water system has done him much good but is not a cure, JDH sends congratulations on the Darwins' seventh child. JDH came to Calcutta [Kolkata] to persuade Jung Bahadur [JB] to let him travel in Nepal but JB cannot guarantee his safety while absent in England. JDH will therefore go instead to Sylhet then the Khassya [Khasia] Hills & Munnipore [Manipur] with [TT].

No summary available.

Spoke too harshly about CD’s involvement in nomenclatural reform.

JDH used to think CD "too prone to theoretical considerations about species", hence was pleased CD took up a difficult group like barnacles. CD’s theories have progressed but JDH not converted. Sikkim has not cleared up his doubts about CD’s doctrines.

Argument with Falconer.

Falconer’s misbehaviour.

Geology of Khashia [Khasi] mountains. Speculations on mountain building and origin of Himalayas.

Wants catalogue of small islands that contain peculiar plants. Thinks complete floras of islands in various stages of depression [subsidence] would provide good data.

James Wilson reports case of salmon hybrids.

Herrings inhabit freshwater lake in Scotland during winter.

JDH will edit juror reports for the Great Exhibition.

Flora of New Zealand.

Reconsidering variability of insular species.

Becoming convinced of the probability that the southern flora is a fragmentary one – all that remains of a great southern continent.