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Basalt is an igneous rock composed largely of augite and felspar, which are silicate crystals of calcium, potassium, alumina, etc., of which the Moonstone is a variety. The connecting link is that clairvoyance is found to be unusually active during and by means of moonlight.
On the contrary, in addition to old granitic and other igneous rocks, all explorers find only either innumerable undulations of sandstones, schistose, and quartzose rocks, or such tufaceous and ferruginous deposits as would naturally occur in countries long occupied by lakes and exuberant jungles, separated from each other by sandy hills, scarcely any other calcareous rocks being found except tufas formed by the deposition of landsprings.
Points of unconformableness in the overlying aqueous rocks, connected with protrusions of granites, and other similar presentments of the internal igneous mass, such as trap and basalt, mark the conclusions of subsequent sections in this grand tale.
MICA SCHIST. Pink marble dolomite, on hills of mica schist, of various colours, with trap, schorl in gneiss, kyanite or disthene gneissose mica in the schist. 1500 ft. COAL IN SANDSTONE. Specular and magnetic iron on various igneous rocks; finely laminated porphyry; granite; hot fountain.
At the foot of this is the Maji ya Wheta, a hot, deep-seated spring of fresh water, which bubbles up through many apertures in a large dome-shaped heap of soft lime an accumulation obviously thrown up by the force of the spring, as the rocks on either side of it are of igneous character. We arrived at the deserted village of Kirengue.
By an igneous injection, I do not mean that the fused rock owed its fluidity to dry heat. The celebrated researches of Sorby on the microscopical fluid cavities in the quartz of granite and quartz veins, have shown beyond a doubt that the vapour of water was present in comparatively large quantities when the quartz was solidifying.
They were, undoubtedly, the insensible particles of his blood; the imperceptible texture of his fibres; the salts, more or less acrid, that stimulated his nerves; the proportion of igneous fluid that circulated in his system. From whence came these elements?
Soon after, the district we traversed became more igneous, wrinkled, cracked, and ropy than anything we had yet seen, and another two hours' scamper over such a track as till then I would not have believed horses could have traversed, even at a foot's pace, brought us to the solitary farm-house of Bessestad.
Over an extensive area, the soil consisted of that igneous gravel called "tuff," reddish in color as if made from crushed bricks. The ground was covered with slag, lava flows, and pumice stones. Its volcanic origin was unmistakable. In certain localities thin smoke holes gave off a sulfurous odor, showing that the inner fires still kept their wide-ranging power.
In the speculation respecting the igneous origin of trap or granite, the fact does not admit of direct proof that those substances have been actually subjected to intense heat. But the same thing might be said of all judicial inquiries which proceed on circumstantial evidence.
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