Returns notes on mule yaks [see Natural selection, p. 438]

and sends queries on silkworms.

A bed is ready any time HF will come.

Instructions for JDH’s trip to Down.

Change in train times.

Asks WBC if he will examine a specimen of calcareous rock.

[Notes on conversations with J. D. Hooker.] Geographical distribution; diffusion and distribution of species. Island and mountain floras; means of migration (high-roads, icebergs).

Thanks for botanico-geographical remarks. CD greatly appreciates JDH’s valuable generalisations.

Questions on JDH’s sketch comparing floras of Australia, New Zealand, and western S. America; wishes to know botanical relations between other southern islands. Botanico-geographical discussions and comments on books sent by JDH.