RECORD: Darwin, C. R. 'Utricularia' [draft of Insectivorous plants, p. 427] Transcribed by John van Wyhe and Kees Rookmaaker (Darwin Online,

REVISION HISTORY: Transcribed by John van Wyhe and Kees Rookmaaker 7.2009. RN1

NOTE: This single sheet is part of a draft of Insectivorous plants (p. 427), the verso was later used by Darwin's son George for mathematical notes. The document was framed and displayed at Christ's College, Cambridge in 1909, see the catalogue, where it is still kept today.

Compare with the similar manuscript fragment given to Dr Victor Albeck in Denmark in 1903 (click here).

Further sheets from the same draft can be found in CUL-DAR221 here. See other notes and papers on Darwin's book on insectivorous plants here.

Editorial symbols used in the transcription:
[some text] 'some text' is an editorial insertion
[some text] 'some text' is the conjectured reading of an ambiguous word or passage
[some text] 'some text' is a description of a word or passage that cannot be transcribed
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<some text> 'some text' is a description of a destroyed word or passage
Text in small red font is a hyperlink or notes added by the editors.

Reproduced with the permission of Christ's College, Cambridge and William Huxley Darwin.

[1 recto]



(The vesicular bundles which run runs up the ventral surface of the bladder bifurcate at a little below distance from below to orifice; & each branch runs round the margin [side] of the orifice, as just from as beyond where the ends of the internal rim collar united with the branch margins of the valve. The two Lateral edges round on each side of the [illeg] valve project a little above the general surface of the bladder, & they [4 words illeg] bear on the outside Hence long multicellular bristles like those on its antennae. Hence I suspect that the medial ventral surface part in of & the upper most sides lateral veins of a bladder the orifice & consists not only of a central infolded division of a leaf, but of two bifurcations bearing spines bristles, all coalesced together.)

(As to quadrifid & bifid processes, which link the whole inside interior of the bladder often one of the greatest

[1 verso]

[mathematical notes by G. H. Darwin, not transcribed]

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

File last updated 2 July, 2012