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Hence crystals of feldspar, enveloped in a mass of liquified, but not highly vesicular lava, would tend to rise to the upper parts; and crystals or granules of the other minerals, thus enveloped, would tend to sink. We ought not, however, to expect any perfect degree of separation in such viscid materials.
This bed is remarkable from containing many globular and pear-shaped, externally rusty balls, from the size of an apple to a man's head, of very tough, slate-coloured porphyry, with imperfect crystals of feldspar: in shape these balls do not resemble pebbles, AND I BELIEVE THAT THEY ARE SUBAQUEOUS VOLCANIC BOMBS; they differ from SUBAERIAL bombs only in not being vesicular.
The first was that of a young lady, who, after ten years' suppression of the menstrual discharge, exhibited the flow from a vesicular eruption on the finger. The other case was quite peculiar, the woman being a prostitute, who menstruated from time to time through spots, the size of a five-franc piece, developing on the breasts, buttocks, back, axilla, and epigastrium.
They are a portion of a flow of dense black vesicular lava, dipping northeastward at a low angle, but little changed as yet by the weather, and about as destitute of soil as a glacial pavement.
For such an expenditure of energy they must receive nourishment and stimulation. The nourishment is supplied by the albumin and proteid of the vesicular and prostatic secretions. The stimulation is supplied by the salts also secreted by these glands. The recent researches of Loeb and others have demonstrated the importance of mineral salts in stimulating the activity of living cells.
The motion of the vesicular vapours, caused by the rising of the sun; the mingling of several layers of air, the temperature and density of which were very different, no doubt contributed to produce an apparent movement of the stars in the horizontal direction.
It is a sort of vesicular appendage, capable of being inflated with air; and supposed to serve as an atmospheric buoy to assist in sustaining the bird in its flight. The annual migration of the bird over the lofty chain of the Himalayas might not be possible, or if possible, more difficult, without this power of decreasing the specific gravity of its body.
The basaltic rocks are of a black colour and thinly stratified; they are generally highly vesicular, but occasionally compact; some of them contain numerous crystals of glassy feldspar and octahedrons of titaniferous iron; others abound with crystals of augite and grains of olivine.
A serenity, uninterrupted during a great part of the year, prevails only in the low regions at the level of the sea, and at considerable heights on those vast table-lands, where the uniform radiation of the soil seems to contribute to the perfect dissolution of vesicular vapours.
One can cite no better example of this stimulant action than the influence of these vesicular and prostatic salts upon the activity of the spermatozoa.
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