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Updated: June 5, 2025
Clays and shales often contain concretions of lime carbonate, of iron carbonate, or of iron sulphide. Some fossil, such as a leaf or shell, frequently forms the nucleus around which the concretion grows. Why are building stones more easily worked when "green" than after their quarry water has dried out?
They gave him the same feeling that her uncle and aunt had given him just now, when they said good-night, following her into their hotel. That good Colonel, that good Mrs. Ercott! The very concretion of the world he had been brought up in, of the English point of view; symbolic figures of health, reason, and the straight path, on which at that moment, seemingly, he had turned his back.
The old castle, in which the family of Rasay formerly resided, is situated upon a rock very near the sea: the rock is not one mass of stone, but a concretion of pebbles and earth, so firm that it does not appear to have mouldered.
It is still used in the manufacture of esteemed perfumes, and is sold at five guineas the ounce. It is found floating on the surface of the ocean, and is a concretion of imperfectly digested matter from the intestine of a whale probably the sperm-whale.
I dare say that this is not the view that M. Monnet takes of the subject, when he thinks to explain to himself the concretion of those different substances by means of water; but, according to my apprehension of the matter, his theory, when sifted to the bottom, will bear no other construction; and, unless he shall consider water like the matter of heat, as capable of producing the fluidity of fusion, and of being also again abstracted from the fluid, by pervading the most solid body, which would then be a substance different from water, he must employ this aqueous substance as a menstruum or solvent for solid bodies, in the same manner as has been done by those naturalists whom he he justly censure, and conform to those erroneous ideas which first observations, or inaccurate knowledge of minerals, may have suggested to former naturalists.
A man's notion of himself is a concretion in discourse for which his more constant somatic feelings, his ruling interests, and his social relations furnish most of the substance.
But, it is only by this false resemblance, that any argument can be formed for the concretion of those bodies from an aqueous solution; in every other respect they are true mineral concretions; and, that these have had a very different origin, has been already the subject of investigation, and will be more particularly examined in the course of this work.
Thus we would seem to have every thing necessary for explaining the concretion and crystallization of siliceous bodies, provided we could find the proper conditions requisite for that operation; for whether it shall be by means of acid or alkaline substances that siliceous matter is to be dissolved, volatilised, and transported from one place to another, it is necessary that those dissolving substances should be present upon those occasions.
Davy, in another place, has stated the advantages arising to this class of vegetables, from their stony external concretion: namely, "the defence it offers from humidity; the shield which it presents to the assaults of insects; and the strength and stability that it administers to plants, which, from being hollow, without this support, would be less perfectly enabled to resist the effect of storms.
Here is an example, according to our author, of granite formed in the moist way. But now, I must ask to see the evidence of that fact; for, from what our author has told us, I do not even see reason to conclude that there was the least concretion, or any stone formed at all.
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