• 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 6-54 Letter, 1874-10-22 | William James Beal to Charles Robert Darwin, 1874-10-22

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