Varying depth of top-soil in a ridge-and-furrow field with a depression.

Sends sentences from Hermann von Helmholtz about difference between minor and major chords.

Thanks GHD for extracts, but says the subject of music is beyond him.

Suggests that GHD deliberate over one or two sentences of his paper on dress ["Developments in dress", Macmillan’s Mag. 22 (1872): 410–16].

Refers to prospective marriage of Amy [Ruck and CD’s son Francis].

Discusses the price of some heliotype prints [for Expression?].

Discusses his health following a visit to Dr C[lark?]. Has made an appointment for CD.

Concerned about GHD’s health. Sends a prescription for a cough mixture.

Distressed by the poor health of GHD and Horace. Asks them to come home.

Anxious to have GHD come home because of his poor health. Recommends Huxley’s physician (Andrew Clark) – an advocate of milk diet.

CD particularly wishes to see JT "On business not connected with himself" [the fund for Huxley’s holiday]. Asks whether CD may call that afternoon. GHD adds postscript saying CD very fatigued. He hopes JT can come to see CD instead, but he should not mention that GHD suggested it.

Corrects chemical concentrations CD has been using [in insectivorous plant experimentation].

Thinks highly of GHD’s article [probably "On beneficial restrictions to liberty of marriage", Contemp. Rev. 22 (1873): 412–26]. A good omen for the future.

Writes for CD to thank RS for his very valuable information.

Criticises CD’s letter to Nature ["Complemental males in certain cirripedes", Collected papers 2: 177–82].

On the elimination of useless parts.

GHD fails to see the point of CD’s use of the law of distribution about a mean.

Sends table showing relative force of impact of weight dropped on a plane inclined at different angles.

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, 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.

Has decided to send the letter ["Variation of organs", Nature 8 (1873): 505].

Writes of his poor health and problems of settling in at Trinity.

Asks GHD whether he can tell him what inclination a polished or waxy leaf ought to hold to the horizon in order to let vertical rain rebound off as much as possible.

On bodies of varying elasticity bouncing off inclined planes [see 9096].