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Updated: May 29, 2025
Pym could not but perceive that the cold was due to a pronounced alteration in the direction of wind-currents; and that under the circumstances the cold would of necessity increase to the point of normal antarctic temperature no doubt below zero unless the wind should before then change. Quickly his mind grasped the circumstances in which they were placed.
For some reason that could not be conjectured, at these times the wind-currents, generally varying but slightly in force and duration, changed, the wind coming from a point of the compass almost diametrically opposite to its usual direction, and increasing in velocity and force to that of a tempest or blizzard.
These zones did not exist before the Pliocene period, and it is not at all clear that any redistribution of currents in earlier times could have had such remarkable consequences. The same difficulty applies to wind-currents. On the other hand, we have already, in discussing the Permian glaciation, discovered two agencies which are very effective in lowering the temperature of the earth.
Let me show you how it happens. "A region of air, over a tropical sea, little moved by wind-currents, becomes warmer than the surrounding region of air; the air over this region becomes lighter; the lighter air rises and flows over the colder layers of surrounding air, increasing the pressure on that ring and increasing the inward flow to the warm central area where the air pressure has been diminished by the overflow aloft.
The intervening dell was knee-deep in drifted snow, the hillside bare in spots, and ridged high in others, where the wind-currents had swirled from base to summit. The passage was a toilsome one, and the stalwart bearers halted several times to shift their light burden before they laid it down upon the mound of mixed snow and red clay at the mouth of the grave.
The sand with which many plains are covered appears sometimes to have been deposited upon them while they were yet submerged beneath the sea, sometimes to have been drifted from the seacoast, and scattered over them by wind-currents, sometimes to have been washed upon them by running water.
Accept now a necklace of pearls which, suspended from the former, will ornament your breast. Some of the Admiral's ship-captains who had made a study of the different wind-currents sought the royal permission to prosecute discoveries at their own expense, proposing to relinquish to the Crown its due, that is to say, one fifth of the profits.
The tallest specimens, growing in sheltered hollows somewhat beneath the heaviest wind-currents, are from eighty to a hundred feet high, and from two to four feet in diameter. The very largest specimen I ever found was nineteen feet seven inches in circumference four feet from the ground, growing on the edge of Lake Hollow, at an elevation of 9250 feet above the level of the sea.
Brightly play the ripples about the bushy edges of the islands and on the plume-shaped streaks between them, ruffled by gentle passing wind-currents.
All his past life seemed to be symbolized by the building-up and breaking-down of those fluctuating shapes, which incalculable wind-currents perpetually shifted and remodelled or swept from the zenith like a pinch of dust.
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