JDH thanks Asa Gray for his letter & review of [Rev. Miles Joseph] Berkeley. Berkeley will not like Gray's review or JDH's in JOURNAL OF BOTANY. JDH comments on Gray's criticism of his ideas on physiology, comparing them to a firework, and to his own less ordered style of critique. Declares that he will not take account of a 'vital force' until anyone else does. Compares American & British terminology i.e. in the United States physiology is synonymous with biology. Discusses nomenclature & the use of the English 'anth' in names such as Ranunculanths, compared to using the suffixes: 'ads' or 'worts' in place of aceae. This was started by [John Stevens] Henslow & despite misgivings JDH has advised [George] Bentham to retain them as they are now effectively sanctioned by the government; being used in the National Schools. He asks Gray not to deter Bentham from using the system as it is the current vogue & it is hard enough to get government to publish such books for the amateur, & this class of people cares a great deal about terminology. JDH thinks [John] Lindley is correct to refer Podostemons to near Lentibulariaceae though he previously thought their place was with Scrophulariaceae.
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CD will advise W. F. Daniell on collecting.
CD will advise Daniell not to apply for Royal Society grant.
CD’s experiment: fish fed seeds, which germinated when voided.
CD finds Alphonse de Candolle very useful, though JDH has low opinion.
CD argues for accidental introductions explaining some odd distributions, e.g., New Zealand vs Australian plants.
CD’s method.
Diverging affinities in isolated genera.
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Separation of sexes in trees [U. S.].
Do plants offer positive evidence for "continuous land" theory?
Protean genera.
Ranges of species in large vs small genera: Asa Gray’s compilation fits CD’s expectation.
CD studies seedling mortality in his weed garden.
JDH’s work on Indian flora.
JDH thanks Asa Gray for his note of 10 Mar [1857]. Is impatient for LESSONS, apologises for not reviewing the MANUAL in the JOURNAL OF BOTANY. William Jackson Hooker wants JDH to review [Miles Joseph] Berkeley's INTRODUCTION TO CRYPTOGAMIC BOTANY, JDH praises its content but calls it 'appallingly written & arranged', a common failing of parson-authors such as Sedgwick & Buckland, Copewell[?] & Baden-Powell. An abstract of the Linnean Society's ideas on genera will appear in the LITERARY GAZETTE & a summary by Bentham in the Linnean journal. JDH is critical of the way Germans approach a subject, A. Braun's work on genera is an exemplar. JDH dismisses [Berthold Carl] Seemann's 'twaddle' about genera being objective or subjective, gives Rosa & Salix as examples of the former & Unbellifers as the 'confoundedly bad' latter. Discusses [Thomas] Thomson's paper on germination & embryos of Careya & Barringtonia. JDH worries about Gray doing a book on forest trees. Notes [Richard] Spruce is stranded in Tarapoto, in the Andes, en route to Lima. Mentions UK government expedition to the source of the Missouri & the East Rocky Mountains, [Eugène] Bourgeau is the botanist & the commander Mr Palliser. JDH's children & wife [Frances Hooker] are in Brighton. JDH suggests a visit to the UK would stimulate Gray's work on the Flora of North America. [Walter Hood] Fitch has produced plates of British natural orders, designed by [John Stevens] Henslow, for the National Schools under the Board of Trade. In a post script dated 30 Mar JDH gives a detailed opinion of Gray's ELEMENTS. JDH cannot visit Canada & USA until 1858, he has too much work, with the Indian Herbarium & Tasmanian flora for the Van Diemen's Land government, & not enough money. Comments briefly on Gray's notices in SILLIMAN & at length on De Candolle's botanical geography, referring to the work of de Heer, Henfrey, Brown, Forbe's Atlantis theory & Duchastre's encyclopaedia. Recommends that Gray get the GARDENERS' CHRONICLE.
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Independence of variation from climate shown by several plant genera; CD asks for confirmation.
Progressing with book [Natural selection].
JDH cites W. H. Harvey’s observations on Fucus and David Don’s on Juncus as examples of variations that are independent of climate. There are many such cases. Gives his working scheme for categorising variation.
Thanks JDH for response on variation. Studying variations that seem correlated with environment, e.g., north vs south, ascending mountains.
CD’s weed garden: observations on slugs killing seedlings.
Seed-salting. One-seventh of the plants of any country could be transported 924 miles by sea and would germinate.
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JH's letter of resignation was read at a full meeting of the [R.S.L.] club last evening and it was the unanimous wish of those present that JH should not resign.