RECORD: Darwin, C. R. n.d. Many as are the individuals of shells in a lake. CUL-DAR205.2.164. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 5.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volume CUL-DAR205.2 contains notes on means of distribution.

The brown crayon number '18' indicates that this document was filed by Darwin in his portfolio for the subject of Migration.

[164]

Many as are the individual of shells in a lake, they are few compared to individual of a marine shells with its average large range & so not so favourable for [illeg] of species—

[in margin:] In. Ch. 6. p. 26/ I have introduced [brief] not on this subject—

(18)

/over

[164v]

The comparison must be made with common species, for we know these vary most. Here bring in on isld & water productions being left behind in case of modification get Hooker to go thru the plants.

The great range of Aquatic productions & some degree of conditions favourable to production of new species

[in margin:] In ordinary station, many temporary inhabitants produced creations.—

In N. America most aquatic species—

[in margin:] In lake if many species, the number of individuals wd be very small in each, & liable to extinction.—

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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 25 September, 2022