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Updated: June 20, 2025
The latter feat which is made easy by the fact that when various senses are stimulated at once the inward instinctive reaction which is felt by a primitive mind more powerfully than any external image is one and not consciously divisible. The first expedient imposes on the flux what we call ideas, which are concretions in discourse, terms employed in thought and language.
Now, this last case is that of almost all mineral concretions. It must not be here alleged that certain concretions have been found in mines posterior to these having been worked by man; consequently, that those concretions have been formed by nothing but the infiltration of water.
The Wenlock Shale, observes Sir R. Murchison, is infinitely the largest and most persistent member of the Wenlock formation, for the limestone often thins out and disappears. The shale, like the Lower Ludlow, often contains elliptical concretions of impure earthy limestone.
These floors are in many places covered with little loose concretions like marbles, and these concretions in the course of time are imbedded in the horizontal layers of the same material.
The gypseous beds are very remarkable, from abounding with, so as sometimes to be almost composed of, irregular concretions, from the size of an egg to that of a man's head, of very hard, compact, heavy gypsum, in the form of anhydrite. This gypsum contains some foreign particles of stone; it is stained, judging from its action with borax, with iron, and it exhales a strong aluminous odour.
If in a comparatively uninteresting field attention can find so many treasures of harmony and order, what beauties might it not discover in interpreting faithfully ideas nobler than extension and number, concretions closer to man's spiritual life?
As material objects, making a single system which fills space and evolves in time, are conceived by abstraction from the flux of sensuous experience, so, pari passu, the rest of experience, with all its other outgrowths and concretions, falls out with the physical world and forms the sphere of mind, the sphere of memory, fancy, and the passions.
The cliffs in Sebastian Bay are 200 feet in height, and are composed of fine sandstones, often in curvilinear layers, including hard concretions of calcareous sandstone, and layers of gravel.
Its particles are concretions in existence like the planets; and if a given hypothesis describing them turns out to be wrong, it is wrong only because this matter exists so truly and in such discoverable guise that the hypothesis in question may be shown to misrepresent its constitution.
On the banks of the Carcarana, a few miles distant, the lowest bed visible was pale Pampean mud, with masses of tosca-rock, in one of which I found a much decayed tooth of the Mastodon: above this bed, there was a thin layer almost composed of small concretions of white tosca, out of which I extracted a well preserved, but slightly broken tooth of Toxodon Platensis: above this there was an unusual bed of very soft impure sandstone.
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