• 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 Portfolios: Seeds & Flowers (Cattell Catalogues): Effects of Selection (DAR 46.2A) | NS I Seeds-33 Note, 1855-05-07 - 1855-09-25 | Radishes, 1855-05-22 - 1855-09-25

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