CD is much obliged for invitations to CB’s parties, but is afraid to accept because he would meet people to whom he has sworn he never goes out.

Sends suggestions for points that would interest geologists in a description of valleys in the Blue Mountains [New South Wales].

Would like to call upon RO to discuss the last engravings sent by George Scharf. CD assumes that the revise of Toxodon [see 395] was received.

Asks Babbage to take small parcel to Henslow.

Sends rock specimen for W. H. Miller. Asks JSH to see whether there is any geology in P. B. Webb and Sabin Berthelot, Histoire naturelle des Îles Canaries [1835–50]. Finds his work on geology growing so large that it will take more than one volume and asks whether this will make publication aid more difficult.

Has accepted Secretaryship of the Geological Society.

Will not come to Cambridge because "as long as I continue well I cannot bear to leave my work for half a day".