• Darwin Archive | 'Origin of Species': portfolios I | 'Natural Selection' chapters 5 and 6, portfolios on Seeds and Flowers (Cattell Catalogues) and 'Habits of Bees': notes on fertilisation of flowers | Materials for chapter 5: 'Struggle for existence' | NS I Chap 5-25 Note, Notebook D: 47-48 (excised page), 1838-08-23 - 1838-08-25 | D 47e, 1838-08-23 - 1838-08-24

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