• 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 6-17 to 6-21 Notes (Asa Gray) | Introduced Plants | NS I Chap 6-20 & 6-21 Notes, 1848-01-01 - 1882-04-30 | Analyses of Introduced & Native Plants, 1848-01-01 - 1882-04-30

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