Sends photographs he intends to use in Expression and asks for estimates of cost per thousand of each process [Woodburytype and Heliotype] suggested by RC and for different numbers of photos on each plate.

Requests that JM make stereotype plates of 6th edition of Origin available to D. Appleton. This will be last edition and CD is "extremely anxious" to spread his views.

Greatly pleased at sale [of Climbing plants].

Points out a discrepancy in their records of copies of Origin printed.

500 more copies of Insectivorous plants should last forever.

Discusses table of Atlantic dust samples. Thinks dust came from South America.

Discusses Patagonian tuff samples.

Answers CD’s query about material from Pampas. Believes deposit made in brackish water.

Criticises account of Atlantic dust in F. J. F. Meyen [Reise um die Erde (1834–5)].

Sends sheets of Origin [4th edition] for CD to correct [for 3d German edition?].

Still has 600 copies of Orchids, but deficit reduced to £30.

Undertakes to pay two-thirds of profits of the [fourth] edition of Origin as soon as one-half of the copies are sold.