Discusses GCW’s Notes on the presence of animal life at vast depths [1860]. Asks for information on the decay of exuviae of organisms at bottom of sea. Has GCW reason to believe extensive areas of sea-bottom are bare? Is he sure rounded pebbles were not dropped by icebergs? Curious that water at such depths retains oxygen.

Response to [3020]. CD has been misled by errors made in the Times notice [5 Dec 1860, p. 5]. GCW does not doubt that Foraminiferous matter as well as other deep sea deposits vary greatly in thickness, but positive results are difficult to establish. Some areas of the sea bed are bare but their extent has not been established. He now thinks that he was too hasty in the conclusion that deep currents produce abrasion and rounding of gravel.

Regrets he cannot come to London to be photographed [for GCW’s Eminent men of the day (1870)]. Invites GCW to Down.