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The stream glided along at the rate of two miles per hour over a rock of ferruginous sandstone containing nodules of ironstone. Nine natives approached the party while on the march this day; and they appeared very well disposed, frank and without fear. They carried no weapons.
Neglect of this rule may bring about the persistence of vocal accidents often very long in curing. It is because professional singers cannot interrupt their work in such cases that they more often than any others suffer from laryngitis and above all in the so dangerous form of chronic inflammation of the vocal cords, which determines the deplorable "singers' nodules."
Flint nodules or other small prominences in the bed rock are found more worn on the stoss than on the lee side, where indeed they may have a low cone of rock protected by them from abrasion. Cavities, on the other hand, have their edges worn on the lee side and left sharp upon the stoss. Surfaces worn and torn in the ways which we have mentioned are said to be glaciated.
"Reasoning by analogy from the characters of other meteoric bodies, he infers that the irons were all included in a large mass of some different material, either crystalline rock, such as constitutes the class of meteorites called 'stony, or else a compound of iron and sulphur, similar to certain nodules discovered inside the iron masses when sawn in two.
Bands and nodules of clay-ironstone are common in coal-measures, and are formed, says Sir H. De la Beche, of carbonate of iron mingled mechanically with earthy matter, like that constituting the shales. Mr.
The balance of the camp, save the sentries, had retired none would enter the Belgian's tent. He fingered the pouch, feeling out the shapes and sizes of the precious, little nodules within. He hefted the bag, first in one palm, then in the other, and at last he wheeled his chair slowly around before the table, and in the rays of his small lamp let the glittering gems roll out upon the rough wood.
The white chalkstone glitters from afar; the light grey feldspar assumes a warm flesh tint; the limestone becomes straw color; the crystals of hornblende flash like fire-flies; and the veins of white quartz, running with their nodules of serpentine and chlorite through the dark clay-slate, gleam as do chain lightnings through the clouds.
The tube, g h, which reaches right down nearly to the bottom of the sieve, takes the water so deep into the vessel that, as long as the water in the apparatus stands high enough above o p, the gelatine nodules are in continuous motion.
Dark trappean rocks full of hornblende have in many places burst through these schists, and appear in nodules on the surface. The highest rock seen is a fine sandstone of closer grain than that at Tette, and quite metamorphosed where it comes into contact with the igneous rocks below it. It sometimes gives place to quartz and reddish clay schists, much baked by heat.
But instead of being hard, as Silurian rocks are wont to be, they are mere loose beds of dark sand and shale, yellow with sulphur, or black with carbonaceous matter, amid which strange flakes and nodules of white quartz lie loose, ready to drop out at the blow of every wave.
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