With this pleasant thought Bob and Paul rolled up in their hammocks, trusting John and Tom to bring them safely through the bad weather that seemed in store, and were soon asleep.
To the two older flyers, used to all conditions of aerial passage as a result of several years' experience, the present conditions were not at all terrifying. Although the spectacle of the dark clouds in front of them was extremely uncanny, they realized that they were only local thunder showers which could probably be avoided by a little careful navigating.
In this they were right. By wheeling a little out of their course, to the left or right, and by flying up over one big cloud which could not be avoided in any other manner, they managed to dodge the most dangerous fields of lightning and the worst torrents of rain.
Presently they left the dark clouds far behind, and once more the stars appeared in the blue firmament above and the pale moon lit up the tropical sea.
With relief John guided the Sky-Bird lower, so that they could keep a sharp lookout for guide-posts of land. They passed several small islets which were uncharted with them, but when, about midnight, they made out a great black blotch not far ahead, they recognized it as the southern end of the island of Borneo, and knew they were all right.
In a little while Borneo was sweeping along below them, its mangroved shores gloomy and desolate-looking, not to say weird, in the pale moonlight. Among those dense forests and thickets the flyers knew many a wild animal was prowling at that very moment, and in the thatched huts in the glens slept many a fierce-visaged savage with weapons close at hand.
Toward morning the flyers observed a volcano in active eruption off to the southeastward, apparently on the island of Timor. It was a beautiful sight, so wonderful that John awoke the sleepers, that they too might enjoy it. Fantastic lights of various colors shot upward from the crater. These shafts lit up billowing clouds of smoke and ashes, which poured out in awe-inspiring volume. Back of it all stood the dark-blue velvet sky, against which the pyrotechnics were embossed in a stunning manner. Man could never have wished to witness a more remarkable manifestation of nature than did the young aviators, as they viewed the spectacle from their own favored position in the air.
Swiftly the Sky-Bird drew them toward the volcano, for it was directly in their course. As they approached, they could see flames licking their way upward from the dark mass of rock constituting the shaft, and could make out streams of lava pouring over the sides of the crater, going down into the unknown blackness below. What a sight it was! How their pulses beat! How their hearts quickened!
But now, very unexpectedly, the sight was shut out. Thin, pungent, volcanic smoke and ash began to surround them. In a few moments it was so thick that they grew alarmed. All had the same fearful thought—
If this should continue a little while, they would lose their bearings, and might run right into the fountain of fire itself!