• 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 6 | Natural Selection 'Habits of Bees' Portfolio (DAR 46.2C) | NS I Chap 6-51 Letter, 1861-02-01 | Francis Walker to Charles Robert Darwin, 1861-02-01

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