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Obviously no other explanation is possible, than the supposition that the 5-13 spiral is still latent, though not displayed by the teasels. But in the very moment when the faculty of decussation disappears, it resumes its place, and becomes as prominent as it must once have been in the ancestors, and is still in that part of their offspring, which has not become changed in this respect.
Even Coventry, which makes a slight variation for one or two roads, and so far disturbs this decussation, by shifting it eastwards, is still in Warwickshire. And probably so called by some remote ancestor who had emigrated from the forest of Ardennes, in the Netherlands, and now for ever memorable to English ears from its proximity to Waterloo.
At other times the straightening may have taken place directly internal to a leaf, and it is torn and may be seen to be attached to the stem by two distinct bases. Summing up this description of the hereditary qualities of our twisted teasels and of their mechanical consequences, we may say that the loss of the normal decussation is the cause of all the observed changes.
Hamilton, of Aberdeen, claims that the corpus callosum is not a commissure, but the decussation of cortical fibers on their way down to enter the internal and external capsules of the opposite side. Profs.
The twisted teasels lose their decussation, but in doing so the leaves are not left in a disorderly dispersion, but a distinct new arrangement takes its place, which is to be assumed as the normal one for the ancestors of the teasel family. The case is to be considered as one of atavism.
In the prosecution of this sport of fancy, he considers every production of art and nature, in which he could find any decussation or approaches to the form of a quincunx; and, as a man once resolved upon ideal discoveries seldom searches long in vain, he finds his favourite figure in almost every thing, whether natural or invented, ancient or modern, rude or artificial, sacred or civil; so that a reader, not watchful against the power of his infusions, would imagine that decussation was the great business of the world, and that nature and art had no other purpose than to exemplify and imitate a quincunx.
The physiological experimenter has also made it evident that the decussation of the conductors of sensitive impressions has its seat in the spinal core, and not in the encephalon, as had been supposed.
The physiological experimenter has also made it evident that the decussation of the conductors of sensitive impressions has its seat in the spinal core, and not in the encephalon, as had been supposed.
He described the decussation of the optic nerves and the capsule of the crystalline lens, and gave the first clear description that has survived of the structure of the eye. He regarded the nerves as originating from the brain, and distinguished between nerves of motion and of sensation. He described the oviduct of the sheep and rightly held that life was possible without the spleen.
It is interesting to see how old questions are incidentally settled in the course of these new investigations. Thus, Mr. Clarke's dissections, confirmed by preparations of Mr. Dean's which I have myself examined, placed the fact of the decussation of the pyramids denied by Haller, by Morgagni, and even by Stilling beyond doubt.
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