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As the disease continues, the internal elastic layer is lost, the muscular coat begins to atrophy, and then small calcareous granules may begin to be deposited, which may form into plates. In the large arteries, the advance of the process differs somewhat. There may be more actual inflammatory signs, fatty degeneration may occur, and even a necrosis may take place.
"I can find the place," said I, after making a careful examination; "but I am happy to tell you that the abscess has either been entirely absorbed, or has turned calcareous, as these solitary abscesses will. There is no fear of its doing you any harm now." He seemed to be by no means overjoyed at the intelligence. "Things always happen so with me," he said moodily.
The rare combination of causes which seems to have led to the faithful preservation of so many treasures of a perishable nature in so small an area, appear to have been the following: first, a river flowing into a lake; secondly, storms of wind, by which leaves and sometimes the boughs of trees were torn off and floated by the stream into the lake; thirdly, mephitic gases rising from the lake, by which insects flying over its surface were occasionally killed: and fourthly, a constant supply of carbonate of lime in solution from mineral springs, the calcareous matter when precipitated to the bottom mingling with fine mud and thus forming the fossiliferous marls.
I have shown that the spinules develop in the mature males not as a modification of the scale, but as separate calcareous deposits the bases of which afterwards become united to the scale.
The branches generally consist of the sandstone, rather firmer than the surrounding matter, with the central parts filled, either with friable, calcareous matter, or with a substalagmitic variety; this central part is also frequently penetrated by linear crevices, sometimes, though rarely, containing a trace of woody matter.
Gourges mentions the spontaneous excretion of a five-ounce calculus; and Thompson speaks of the discharge of two calculi of enormous size. Of the extravesical calculi some are true calculi, while others are simply the result of calcareous or osseous degeneration. Renal and biliary calculi are too common to need mention here. There are some extraordinary calculi taken from a patient at St.
Some of the blackish varieties of this rock have a conchoidal fracture and resemble basalt; others have an irregular fracture. Some of the grey and purplish varieties are thickly speckled with green earth and with white crystalline carbonate of lime; others are largely amygdaloidal with green earth and calcareous spar.
Other earths are occasionally mixed in clays, or perhaps always to be found in some small portion. But this does not affect the general character of clay; it only forms a special variety in the subject. A sensible or considerable portion of calcareous earth, in the composition of clay, constitutes a marl, and a sufficient admixture of sand, a loam.
I found, also, two broken columns of stone, three or four feet high, formed like stumps of trees, and of a thickness superior to the body of a man, but whether this was coral or wood now petrified, or whether they might not have been calcareous rocks worn into that particular form by the weather I cannot determine.
Not only is the bituminous matter of coal found mixed in every different proportion with the earthy or uninflammable materials of strata, but the coaly or bituminous composition is found with perhaps every different species of substance belonging to strata. This is certain, that we have the coaly matter intimately mixed with argillaceous and with calcareous strata.
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