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And the pyramid seemed to be illumined by some sad dawn of the end of the world, a dawn which made ruddy only the sands and the granites of earth, and left the heavens, pricked with their myriad stars, more awful in their darkness.
Our own English rocks, which supply excellent building stone from their thin and easily divisible beds, are for the most part entirely incapable of being worked into shafts of any size, except only the granites and whinstones, whose hardness renders them intractable for ordinary purposes; and English architecture therefore supplies no instances of the block shaft applied on an extensive scale; while the facility of obtaining large masses of marble has in Greece and Italy been partly the cause of the adoption of certain noble types of architectural form peculiar to those countries, or, when occurring elsewhere, derived from them.
The thousands or tens of thousands of feet of rock which once overlay the schists and still more the granites and gneisses must have been slowly removed by erosion, for there was no other way to get rid of them. This process must have taken tens of millions of years, and yet the whole work must have been practically completed a hundred or perhaps several hundred million years ago.
If this rule hold true generally, the geological position of tin accessible to the miner will belong, for the most part, to rocks older than those bearing lead. The tin veins will be of higher relative antiquity for the same reason that the "underlying" igneous formations or granites which are visible to man are older, on the whole, than the overlying or trappean formations.
On all sides the borders of this highland area are deeply grooved by numberless streams flowing in narrow gorges. Against its nucleus of very ancient granites and porphyries the Ozark series of magnesian limestone was laid down. Then the area occupied by these rocks was elevated, and around its margins were deposited successively the other members of the Paleozoic.
In those days the rocks which are now the very bones and sinews of our mother Earth her granites, her porphyries, her basalts, her syenites were melted into a liquid mass.
So the name of Primary Rocks, or First Rocks, was given to the granites and other such rocks, and the name of Secondary Rocks to all water-built rocks; while those of the third class were called Transition Rocks, because they seemed to be a kind of link or stepping-stone in the change from the First to the Second Rocks.
Now the least ancient granites are also the least destitute of metals; and several auriferous rivers and torrents in the Andes, in the Salzburg, Fichtelgebirge, and the table-land of the two Castiles, lead us to believe that these granites sometimes contain native gold, and portions of auriferous pyrites and galena disseminated throughout the whole rock, as is the case with tin and magnetic and micaceous iron.
And certain of the granites, so hard that our steel chisels could not cut them, have kept their polish despite the lapse of centuries, and my fingers slip in touching them. There is now no sound. The music of the night birds has ceased. I listen in vain so attentively that I can hear the beating of my heart. Not a sound, not even the buzzing of a fly.
As indescribably lovely is the after-glow, the zodiacal light which may have originated the pyramid; the lively pink reflection from the upper atmosphere; the vast variety of tints with which the greens and the reds, the purples and the fiery crimsons of the western sky tincture the receptive surface of the neutral-hued granites; and the chameleon-shiftings of the dying day, as it sinks into the arms of night.
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