Charles Darwin quote: It is a fatal fault to reason whilst observing, though...

It is a fatal fault to reason whilst observing, though so necessary beforehand and so useful afterwards.

Charles Darwin

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Charles Darwin, Richard Keynes (2005). “Charles Darwin's Zoology Notes and Specimen Lists from H. M. S. Beagle”, p.10, Cambridge University Press

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It is a fatal fault to reason whilst observing, though so necessary beforehand and so useful afterwards. - Charles Darwin

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