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The favourite stones, when the neighbourhood of the nest permits, are little nodules of quartz, smooth and semitransparent. These are selected with minute care. The insect weighs them, so to say, measures them with the compass of its mandibles and does not accept them until after recognizing in them the requisite qualities of size and hardness.
#Chronic Rheumatism.# This term is applied to a condition which sometimes follows upon acute articular rheumatism in persons presenting a family tendency to acute rheumatism or to inflammations of serous membranes, and manifesting other evidence of the rheumatic taint, such as chorea or rheumatic nodules.
It is almost as certain as it is that in our little annual circle round the sun are points at which we are stoned and brick-batted like a pig in a potato-patch pelted with little nodules of meteoric metal flung like gravel, and bombarded with gigantic masses hurled by God knows what?
The Pampean mud is here of a rather pale colour, and includes small nearly white nodules, and other irregular strata of an unusually arenaceous variety of tosca-rock. In a well at the depth of seventy feet, according to Ignatio Nunez, much tosca-rock was met with, and at several points, at one hundred feet deep, beds of sand have been found.
A few leagues southward of these two places, on each side of the low primary range of S. Juan, there are some flat-topped, cliff-bounded, separate little hills, very similar to those fringing the primary ranges in the great plain south of Buenos Ayres: they are composed- -1st, of calcareous tuff with many particles of quartz, sometimes passing into a coarse conglomerate; 2nd, of a stone undistinguishable on the closest inspection from the compacter varieties of tosca-rock; and 3rd, of semi-crystalline limestone, including nodules of agate: these three varieties pass insensibly into each other, and as they form the uppermost stratum in this district, I believe that they, also, are the equivalents of the pure crystalline limestone, and of the red and white sandstones and conglomerates.
The eye-balls are nodules of iron-pyrites, cut hemispherically and highly polished, and are surrounded by circles of hard white shell, similar to that forming the teeth of the wooden mask. The Aztecs made their mirrors of iron-pyrites polished, and are the only people who are known to have put this material to ornamental use.
The secondary growths are deeply pigmented, being usually of a coal-black colour, and melanin pigment may be present in the urine. When recurrence takes place in or near the scar left by the operation, the cancer nodules are not necessarily pigmented. [Illustration: FIG.
It contains a very few pebbles of quartz, and occasionally layers of chalcedonic nodules, like those of chert in our Greensand. From the pureness of this calcareous rock, it has been searched for in other places, but has never been found. From this circumstance, and from the character of the deposit, it was probably formed by a calcareous spring entering a small pool or narrow creek.
On closer examinations he found that each of these nodules contained a few granules of the coal-black melanin of malarial fever. Further studies and experiments showed that these particular cells could always be found in the walls of the stomach of this particular species of mosquito a few days after it had bitten a malarial patient. This epoch-making discovery was made in 1898.
At five o'clock the low sand hills appeared to view in little nodules upon the horizon, and the Steeple of Ostend with its Lighthouse were visible from deck.
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