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A reprint of a classical work in the Cambridge Library Collection.
Darwin had long been fascinated by insectivorous plants, from the native British sundews and bladderworts to the exotic pinguiculas and nepenthes which he encountered during the Beagle voyage. Growing in environments low in soil nutrients, their highly specialised ways of obtaining enough food, including the capability for fast movement in the case of the Venus flytrap, were evidence of evolutionary adaptation. But he was also interested in what food they needed, and whether they would be selective when offered a varied diet; and how did the flytrap close its trap on its prey? Darwin conducted a range of simple but ingenious experiments on his collection of insectivores and observed and noted the results of each with his customary meticulousness. The results can be seen in this book, which remains of enormous interest to anyone whose imagination has been fired by these strange and beautiful plants.
1. Drosera rotundifolia, or the common sun-dew; 2. The movements of the tentacles from the contact of solid bodies; 3. Aggregation of the protoplasm within the cells of the tentacles; 4. The effects of heat on the leaves; 5. The effects of non-nitrogenous and nitrogenous organic fluids on the leaves; 6. The digestive power of the secretion of Drosera; 7. The effects of salts of ammonia; 8. The effects of various other salts, and acids, on the leaves; 9. The effects of certain alkaloid poisons, other substances and vapours; 10. On the sensitiveness of the leaves, and on the lines of transmission of the motor impulse; 11. Recapitulation of the chief observations on Drosera rotundifolia; 12. On the structure and movements of some other species of Drosera; 13. Dionaea muscipula; 14. Aldrovanda vesiculosa; 15. Drosophyllum, Roridula, Byblis, glandular hairs of other plants, concluding remarks on the Droseraceae; 16. Pinguicula; 17. Utricularia; 18. Utricularia (continued); Index.