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Suddenly, through all the turmoil of shattering explosions, tossing air-currents and drifting, acrid smoke, he became conscious of a sudden, swift-flying pursuer. By the light of the burning Plant, down there somewhere in the vapors of the thunderous Falls, he saw a hawk-like 'plane that swooped toward him with incredible velocity, savage and lean and black.
Fenwick was not so well acquainted with our hero, he had heard much about him, and put faith in his skill to carry them out of their present difficulty. "Are you sure you can't turn around and go back?" asked Mr. Fenwick. His knowledge of air-currents was rather limited. "It is out of the question," replied Tom, simply.
He has dealt with nearly every kind of awkward position into which one might be driven in a gale of wind, or in a flight over mountains where air-currents prevail. "He has thus gained evidence which will be of the utmost value to present and future pilots, and prove a factor of signal importance in the preservation of life in the air." Such words as these, coming from a man of Mr.
Their summits are not safe places for scientific experiment on the principles of air-currents, as Knight had now found, to his dismay. He still clutched the face of the escarpment not with the frenzied hold of despair, but with a dogged determination to make the most of his every jot of endurance, and so give the longest possible scope to Elfride's intentions, whatever they might be.
The explanation of this can hardly be doubtful, being analogous to the formation of a night-cap on a mountain peak where warm moist air-currents become chilled against the cold rock surface, forming, momentarily, a patch of cloud which, though constantly being blown away, is as constantly re-formed, and thus is made to appear as if stationary.
Further, the climate being very warm, there was not except in the possession of a hundred men whose business took them on visits to islands lying outside of the crater-warmed air-currents a heavy wrap of any kind, such as overcoat, cloak, or shawl, in the entire city.
They are living airplanes, and their power is so evenly and subtly distributed and applied, that the trick of it escapes the eye. But of course they avail themselves of the lifting power of the air-currents. All birds know how to use their wings to propel themselves through the air, but the mechanism of the act we may not be able to analyze.
But a willow will grow in baked sand wet with rain-water. An air-plant will grow by feeding on the winds. Nay, those huge forests that overspread great continents have built themselves up mainly from the air-currents with which they are always battling. The oak is but a foliated atmospheric crystal deposited from the aërial ocean that holds the future vegetable world in solution.
Starling was full of her own cogitations. Diana's thoughts were not like that, hard-twisted and hard-knotted lines of argument, growing harder and more twisted towards their end; but wide flowing and soft changing visions, flowing sweet and free as the clouds borne on the air-currents of heaven; catching such colours, and drifting as insensibly from one form into another.
So also it is the heat-waves which make the air hot and light, and so cause it to rise and make winds and air-currents, and these again give rise to ocean-currents. It is these dark rays, again, which strike upon the land and give it the warmth which enables plants to grow.
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