RECORD: Darwin, C. R. 'Considering the endless generations of organisms during almost infinite ages' (6.1840) CUL-DAR205.5.30 Transcribed by Kees Rookmaaker (Darwin Online,

REVISION HISTORY: Transcribed by Kees Rookmaaker, corrections by John van Wyhe 11.2010. RN1

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Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.


Maer June; 40 —

Considering the endless generations of organisms during almost infinite ages, it is no wonder that endless strange adaptations & endless strange forms produced — by the wear & tear of forms (like fragmnets of rocks rounded with endless figures) — It is not strange there should be leaches, — fish & blood-sucking bats — (P) Birds living on what others throw up — (NB in the Carrancha we see approximate habit, showing how instinct might have been formed —) In scissor-bill we cannot show intermediate form

[30 verso]

Kingfisher habits may be seen commencing in the Bien to Veo —

— P

In Sea Birds we can shew no gradation in habit on feeding on what other birds throw up — But in Sea Eagle. (quote the noble passage of American Eloquence) we can show Carrancha

Java swallows — Elizabeth thinks the common martin wets clay with saliva. see Yarrell

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

File last updated 2 July, 2012