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"Let us not underrate the value of a fact; it will one day flower in a truth." The defects in Sprengel's work were, after all, not actual defects. The error lay simply in his interpretation of his carefully noted facts.
This radical assumption of fertilization in the individual flower, which lay at the base of Sprengel's theory, thus so completely exposed as false, discredited his entire work.
Alas for the irony of fate! Under Darwin's interpretation the very "defects" which had rendered Sprengel's work a failure now became the absolute witness of a deeper truth which Sprengel had failed to discern. One more short step and he had reached the goal. But this last step was reserved for the later seer.
There is in one of Sprengel's books which I read in my youth, at that time when I used to read in my youth, at that time when I used to read anything and everything, some ideas about "the loves of flowers" which now return to memory after having been forgotten for half a century, and which to-day interest me so much that I regret not to have devoted the humble capacities of my mind to the study of insects and of plants.
He must also have contemplated the transport of pollen from plant to plant by wind and insects; and we know from another source that he looked upon Sprengel's ideas as far from fantastic. Yet, instead of taking the single forward step which now seems so obvious, he even hazarded the conjecture that the insect-forms of some orchideous flowers are intended to deter rather than to attract insects.
With respect to the difference in the corolla of the central and exterior flowers of a head or umbel, I do not feel at all sure that C. C. Sprengel's idea that the ray-florets serve to attract insects, whose agency is highly advantageous in the fertilisation of plants of these two orders, is so far-fetched, as it may at first appear: and if it be advantageous, natural selection may have come into play.
When the colour is absent from only one of the two upper petals, the nectary is not quite aborted but is much shortened. With respect to the development of the corolla, Sprengel's idea that the ray-florets serve to attract insects, whose agency is highly advantageous, or necessary for the fertilisation of these plants, is highly probable; and if so, natural selection may have come into play.
As Hermann Müller has said, "Sprengel's investigations afford an example of how even work that is rich in acute observation and happy interpretation may remain inoperative if the idea at its foundation is defective." What, then, was the flaw in Sprengel's work? Simply that he had seen but half the "secret" which he claimed to have "discovered."
Insects in approaching the nectar brush the pollen from the anthers with various hairy parts of their bodies, and in their motions convey it to the stigma. But Sprengel's seeming victory was doomed to be turned to defeat. The true "secret" was yet unrevealed in his pages. For seventy years his book lay almost unnoticed.
The good was condemned with the bad, and the noble volume was lost in comparative oblivion only to be finally resurrected and its full value and significance revealed by the keen scientific insight of Darwin . From the new stand-point of evolution through natural selection the facts in Sprengel's work took on a most important significance.
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