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Updated: June 21, 2025
The wind, impinging against the vertical wall, creates an ascending current which shoots somewhat past the crest of the rock, and thus the observer or the animal is protected against the tempest by a barrier of air."-Leonhard und Bronn, Jahrbuch, 1841, p. 3. The laws which govern the formation of dunes are substantially these.
Forchhammer, in Leonhard und Bronn s Jahrbuch, 1841, p. 8, says of the sand-hills of the Danish coast: "It is not rare to find, high in the knolls, marine shells, and especially those of the oyster.
It is true that I was still obliged to give up a part of my time to the study of medicine, but while advancing in my professional course by a steady application to anatomy and physiology, I attended the lectures of Leuckart in zoology, and those of Bronn in paleontology. The publication of Goldfuss's great work on the fossils of Germany was just then beginning, and it opened a new world to me.
When, in the course of time, marine currents cut away the coast, the dunes move landwards and fill up the ponds and thus are formed the remarkable strata of fossile peat called Martorv, which appears to be unknown to the geologists of other parts of Europe." Forchhammer, in Leonhard und Bronn, 1841, p. 18.
The place of the sandstones of the Foreland is not yet clearly made out, as they are cut off by a great fault and disturbance. Spirifera disjuncta, Sowerby. Syn. Sp. Verneuilii, Murch. Phacops latifrons, Bronn. Clymenia linearis, Munster. The fossils are numerous, and comprise about 150 species of mollusca, a fifth of which pass up into the overlying Carboniferous rocks.
Let us suppose that the males of our Tanais, hitherto identical in structure, begin to vary, in all directions as Bronn thinks, for aught I care.
Bronn also insists that distinct species never differ from each other in single characters, but in many parts; and he asks, how it always comes that many parts of the organisation should have been modified at the same time through variation and natural selection? But there is no necessity for supposing that all the parts of any being have been simultaneously modified.
Brodie, Sir B., on the origin of the moral sense in man. Bronn, H.G., on the copulation of insects of distinct species. Bronze period, men of, in Europe.
Bronn adduces the length of the ears and tails in the different species of hares and mice the complex folds of enamel in the teeth of many animals, and a multitude of analogous cases. With respect to plants, this subject has been discussed by Nageli in an admirable essay.
Although each formation may mark a very long lapse of years, each perhaps is short compared with the period requisite to change one species into another. I am aware that two palæontologists, whose opinions are worthy of much deference, namely Bronn and Woodward, have concluded that the average duration of each formation is twice or thrice as long as the average duration of specific forms.
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