RECORD: Darwin, C. R. [1858.10.23-11.13]. Draft of Origin of species, [Sect. VI, folio 231](a)(b). CUL-DAR185.146. Edited by John van Wyhe (Darwin Online,

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

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of Richard Darwin Keynes, the Syndics of Cambridge University Library and William Huxley Darwin. Accepted at CUL in lieu for Inheritance for the estate of Richard Darwin Keynes. This manuscript has been on display at Down House.

See the introduction to the Origin of species drafts by John van Wyhe

The text of the draft corresponds to Origin, Chapter VI, Difficulties on theory, p. 206.


(a) By unity of type is implied meant that fundamental agreement of organic beings in structure, which we see in organic beings of the same class, & which is quite independent of their habits of life.

(B) ; the adaptations being aided in some cases by habit & disuse; being slightly affected by the direct action of the external conditions; & being in all cases subjected to the laws of correlation of growth.

[there are pin holes where this slip was attached to the back of folio 231]
[top of one word excised; bottom of page excised]



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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (

File last updated 24 November, 2023