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Concretions in existence are subsumed, when named, under concretions in discourse. Grammar lays violent hands upon experience, and everything becomes a prey to wit and fancy, a material for fiction and eloquence. Man's intellectual progress has a poetic phase, in which he imagines the world; and then a scientific phase, in which he sifts and tests what he has imagined.
These concretions often unite into irregular strata; and over very large tracts of country, the entire mass consists of a hard, but generally cavernous marly rock: some of the varieties might be called calcareous tuffs. Dr.
Kent collected for me some silicified wood and shells out of the concretions in the sandstone from Tome, situated a short distance north of Lirguen. They consist of: Natica australis, d'Orbigny, "Voyage, Part Pal." 2. Mactra Araucana, d'Orbigny, "Voyage, Part Pal." 3. Trigonia Hanetiana, d'Orbigny, "Voyage, Part Pal." 4.
It weakens the blood vessels so that they easily rupture, which causes apoplexy, paralysis and death. Calcareous concretions in the kidneys and bladder, also, come from the same cause, and are called gravel. Such deposits are not only annoying and painful to the patient, but in time may prove fatal if not removed by surgery.
From Level of Sea to Surface of plain, 252 feet above sea, through levels F, E, D and C: F. Lower sandstone, with concretions and silicified bones, with fossil shells, all, or nearly all, extinct. E. Upper ferruginous sandstone, with numerous Balani, with fossil shells, all, or nearly all, extinct. C and D. Calcareous beds with recent shells.
These arrested and recognisable ideas, concretions of similars succeeding one another in time, are not abstractions; but they may come to be regarded as such after the other kind of concretions in experience, concretions of superposed perceptions in space, have become the leading objects of attention.
I found marine remains only in one spot, in some concretions of hard calcareous sandstone: in several other districts I have observed that organic remains were exclusively confined to such concretions; are we to account for this fact, by the supposition that the shells lived only at these points, or is it not more probable that their remains were preserved only where concretions were formed?
Although for the most part unstratified, it betrays in some places marks of stratification, especially where it contains calcareous concretions, or in its lower part where it rests on subjacent gravel and sand which alternate with each other near the junction.
Giants in Size. Indeed, one of the professors was certain that some little concretions found on the interior of the piece of skull were petrified portions of the brain matter itself, and he set to work with the microscope to examine its organic quality.
Heart-clots were very common, if not universally present, in the cases of ulceration of the intestinal mucous membrane; while in the uncomplicated cases of diarrhea and scurvy, the blood was fluid and did not coagulate readily, and the heart-clots and fibrinous concretions were almost universally absent.
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