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CONCRETIONS. Ground water seeping through the pores of rocks may gather minerals disseminated throughout them into nodular masses called concretions. Thus silica disseminated through limestone is gathered into nodules of flint. While geodes grow from the outside inwards, concretions grow outwards from the center. Nor are they formed in already existing cavities as are geodes.
The mass contains numerous broken crystals of olivine and augite, and small particles of black and brown scoriae; it is often traversed by thin seams of calcareous matter. It generally affects a nodular or concretionary structure.
They are pearly white in colour, pitted and nodular on the surface, rarely larger than a pea, although when compressed they may cake into masses of considerable size. With the movements of the joint many of the tumours become detached and lie in the serous exudate excited by their presence.
It is a sort of loose nodular limestone, which when wetted and rolled cements together and forms a road-surface smooth and compact as an asphaltum pavement, and of excellent wearing quality. It is a magnificent road to bicycle over; not only is it broad, level, and smooth, but for much of the way it is converted into a veritable avenue by spreading shade-trees on either side.
The submaxillary glands may be enlarged, and at first more or less hard and painful, but later they become nodular and adhere to the jaw or skin. Nodules and ulcers may form on the skin over the inferior wall of the abdomen and the inside of the hind limbs and are known as "farcy buds." Lymphatic vessels near these buds become swollen and hard.
Flints of Strepy type are nodular and partly trimmed into cutting edges, the smooth surface being left as a handle. The St. Acheul series has finer flaking, the crust being completely removed: there is a tendency to ovate or almond shapes, and the edges are often curved, the reverse S-curve being preferred, They diminish in size towards the end of the period. The Chelles and St.
It is, however, well-known, that in several places, obsidian has flowed in streams like lava; for instance, at Teneriffe, at the Lipari Islands, and at Iceland. In an analysis by Vauquelin of a specimen of obsidian from Hecla, which probably flowed as lava, the proportion of silica is nearly the same as in the nodular or concretionary obsidian from Mexico.
The general treatment is carried out on the same lines as in other acute infective diseases. #Chronic Glanders.# In the horse the chronic form of glanders is known as farcy, and follows infection through an abrasion of the skin, involving chiefly the superficial lymph vessels and glands. The lymphatics become indurated and nodular, constituting what veterinarians call farcy pipes and farcy buds.
In addition to acting as channels for the conveyance of bacterial infection, lymph vessels frequently convey the cells of malignant tumours, and especially cancer, from the seat of the primary disease to the nearest lymph glands, and they may themselves become the seat of cancerous growth forming nodular cords.
Sometimes it is soft and filled with pus. Tumors of long standing may possess uneven, nodular surfaces and fistulous openings. When the tongue is affected, it is swollen and painful, and prehension and mastication of the food may be impossible. When the pharynx is the seat of disease, breathing and swallowing are difficult and painful.
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