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To John Lubbock   12 November [1881]1

Down—

Nov. 12th

My dear Lubbock—

I think that your sentence will do excellently about the Glacial Lakes.—2

I am very glad you thought about the Dimorphism of Butterflies—it seems to me well worth inserting.— I cannot clearly recall to mind about the Leptodora,—it seems to come in rather oddly after the Butterflies.3

Ever yours | C. Darwin

1
The year is established by the reference to Lubbock 1881a (see n. 2, below).
2
CD was commenting on a text for the published version of Lubbock’s presidential address to the British Association for the Advancement of Science, which had met in York from 31 August to 7 September (Lubbock 1881a). He had previously commented on a draft of the address that Lubbock had sent in August (see letter to John Lubbock, 2 August 1881). On the formation of glacial lakes, see Lubbock 1881a, pp. 22–3.
3
For the discussion of dimorphism in butterflies and two developmental forms of Leptodora (a genus of water fleas), see Lubbock 1881a, pp. 7–8.

Manuscript Alterations and Comments

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Please cite as “DCP-LETT-11743F,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-11743F