• 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 6-22 to 6-33 Notes & Abstracts (H. C. Watson) | Species per genus in alien plants | NS 1 Chap 6-30 Note, 1809-01-01 - 1882-04-30 | Wide ranging species will 'spread still further', 1809-01-01 - 1882-04-30

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