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Undertakes to write geological part of Admiralty Instructions [A manual of scientific enquiry (1849), Collected papers 1: 227–50]. Has doubts as to his success.
Sends MS of his chapter on geology for Manual [Collected papers 1: 227–50]. Fears it may be too long. Does not much like it but can do no better. After hesitation, has recommended books. Defends his point that mere collection of rock specimens is "of hardly any use to Geology".
Sends MS of "Geology" for Manual [Collected papers 1: 227–50]. First parcel lost. Asks JFWH to give advice on an unclear note, translated from Élie de Beaumont, on measuring incline of lava-flows.
Describes colour changes from blue to red in valves of operculum of the cirripede genus Ibla.
Sends two valves of Ibla.
In his chapter [for Manual, Collected papers 1: 227–50], he will strike out any part that JFWH wants struck out, but if much shortening is required it will need rewriting.
Thanks JFWH for the trouble he has taken to correct printing error in "Geology".
Discusses Dr Gully’s water-cure.
Sends a copy of Origin as a measure of his respect and in recognition of the obligation he feels he owes to JFWH’s book [A preliminary discourse on the study of natural philosophy (1831)]. "Scarcely anything in my life made so deep an impression on me."
Thanks JFWH for his "Physical geography" [from the Encyclopaedia Britannica (1861)]
and for what he says about Origin, though JFWH goes but a little way with CD. Gives reasons why he cannot accept "Design" in nature, though he is in a "complete jumble" on the point. Is confident of his views because they have aided good workers in several fields to "group and understand many scattered facts".
Requests information for W. S. Macleay on JFWH’s method of catching pelagic animals while ship is under way.
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