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Discusses his health following a visit to Dr C[lark?]. Has made an appointment for CD.
Sends table showing relative force of impact of weight dropped on a plane inclined at different angles.
Has heard that Mr Allen wishes to let his house and thinks it probable that it would suit his son [Francis]. Asks whether he may have refusal of it.
Thanks KM for gift of his "great work on Capital" [2d German ed. of Das Kapital]. Wishes he understood more of "the deep & important subject of political Economy".
Hears from Frank [Darwin] that Drosera behaves perversely. Suggests that motor influence may move longitudinally away from the excited glands.
Information for CD’s use in investigating digestion by Drosera.
Sends tracing of ancient Egyptian illustration of dogs and cattle.
Sends CD a draft of a letter to Nature [see 9087], which he thinks expresses CD’s meaning.
CD thinks GHD’s letter is an excellent clarification [of CD’s conjectural view on the elimination of useless parts in species], but does not want to publish it as his [CD’s] own. Asks GHD to think carefully before he publishes it.
Sends formula for pure pepsin for experiments on digestion of Drosera, and information on legumin. Will send chlorophyll soon.
Sends, with CD’s approval, a clarification of CD’s explanation of how useless organs might diminish [see 9061]. Using Quetelet’s law of normal distribution GHD shows how horns of cattle, having become useless, would gradually diminish and finally disappear.