• 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 Portfolio (DAR 46.2B) | NS I Chap 6-8 Note | Classification number: '15', 1855-06-21

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