Das entdeckte Geheimnis der Natur im Bau und in der Befruchtung der Blumen

Das entdeckte Geheimnis der Natur im Bau und in der Befruchtung der Blumen, a little known book by Christian Konrad Sprengel on The Secret of Nature in the Form and Fertilisation of Flowers Discovered, was rejected by other naturalists when it was published in 1793,^[1] but was found to be of immense use by Charles Darwin who repopularised it with the publication of his book on the Fertilisation of Orchids, and it became a central part of plant ecology.^[2]

The fact that flowers have a sexual role had been recognised earlier by Linnaeus who did not investigate any functional significance of the visits of insects, but by Sprengel's time it was known that they were sometimes involved in fertilisation. These were thought to be chance visits and nectar was not thought to be intended for insects. Sprengel's book introduced a functional view, which would today be called ecology, and provided evidence that pollination was an organised process in which insects acted as "living brushes" in a symbiotic relationship for the teleological purpose of fertilising the flowers. His discovery enabled him to understand the construction and arrangement of the parts of flowers, but he was puzzled by some features such as the lack of nectar in orchids. He also investigated seed dispersal. His ideas went against prevailing dogma that flowers were generally self-fertilising and that insect visits were rare, so his proposals were thought unnecessary. His ideas were also in conflict with belief in the created harmony of nature: in disagreeing with him, Goethe described nature as behaving like an artist, not a workman. Sprengel's discoveries were ignored and largely forgotten.^[3]

Darwin's new evolutionary ideas rejected the idea that species characters were invariable. He was aware from animal husbandry that inbreeding could lead to changes, but as wild species usually remained homogenous, he thought that species were kept the same by natural cross-fertilisation. It would also give the evolutionary advantage that favourable changes were spread through a reproductive community, but this was contradicted by the common supposition that plants were usually self-fertilising. Sprengel's work suggested answers to this problem, and Darwin adopted Sprengel's methods in investigating various plants, particularly orchids.^[4] He mentioned Sprengel in a 1841 letter to the The Gardeners' Chronicle.^[5] and made reference to Sprengel's research in his unpublished 1844 Essay on the origin of species.^[6] A year later, Darwin wrote to his friend the botanist Joseph Dalton Hooker about the need for insects to pollinate flowering plants; "have you ever seen C. Sprengels curious book on this subject; I have verified many of his observations: doubtless he rides his theory very hard."^[7]

Notes

1. ^ Vogel 1996, pp. 44–45
2. ^ Darwin 1958, pp. 127–128
3. ^ Vogel 1996, pp. 48–56
4. ^ Vogel 1996, pp. 56–57
5. ^ Darwin Correspondence Project - Letter 607 — Darwin, C. R. to Gardeners' Chronicle, (16 Aug 1841), http://www.darwinproject.ac.uk/darwinletters/calendar/entry-607.html#mark-607.f4, retrieved 2009-07-20 
6. ^ Darwin 1909, p. 233
7. ^ Darwin Correspondence Project - Letter 889 — Darwin, C. R. to Hooker, J. D., (11–12 July 1845), http://www.darwinproject.ac.uk/darwinletters/calendar/entry-889.html, retrieved 2009-07-20 

References

• Vogel, Stefan (1996), Barrett, Spencer C. H.; Lloyd, David W., eds., Floral biology: studies on floral evolution in animal-pollinated plants, London: Chapman & Hall, pp. 44–60, ISBN 0-412-04341-6, http://books.google.com/?id=HgFA7mFHp2QC&pg=PA44&dq=Sprengel+darwin+brown+insect