The dialogue is interrupted by a shout heard from one who rides near the front of the troop. It is a cry as of alarm, and is so understood by all; at the same time all comprehending that the cause is something seen afar off.
In an instant every individual of the party springs up from his sitting posture, and stands erect upon the back of his horse, gazing out over the plain. The corpse alone lies still; the captive girl also keeping her seat, to all seeming heedless of what has startled them, and caring not what new misfortune may be in store for her. Her cup of sorrow is already full, and she recks not if it run over.
Chapter Twenty Four.
Caught in a Dust-Storm.
At the crisis described, the Indian party is no longer travelling upon the Pilcomayo’s bank, nor near it. They have parted from it at a point where the river makes one of its grand curves, and are now crossing the neck of the peninsula embraced within its windings. This isthmus is in width at least twenty miles, and of a character altogether different from the land lying along the river’s edge. In short, a sterile, treeless expanse, or “travesia”—for such there are in the Chaco—not barren because of infertility in the soil, but from the want of water to fertilise it. Withal, it is inundated at certain periods of the year by the river’s overflow, but in the dry season parched by the rays of a tropical sun. Its surface is then covered with a white efflorescence, which resembles a heavy hoar frost; this, called salitré, being a sort of impure saltpetre, left after the evaporation and subsidence of the floods.
They have entered this cheerless waste, and are about midway across it, when the cry of alarm is heard; he who gave utterance to it being older than the others, and credited with greater knowledge of things. That which had caught his attention, eliciting the cry, is but a phenomenon of Nature, though not one of an ordinary kind; still, not so rare in the region of the Chaco; since all of them have more than once witnessed it. But the thing itself is not yet apparent save to him who has shouted, and this only by the slightest sign giving portent of its approach. For it is, in truth, a storm.
Even after the alarmist has given out his warning note, and stands on his horse’s hips, gazing off in a certain direction, the others, looking the same way, can perceive nothing to account for his strange behaviour. Neither upon the earth, nor in the heavens, does there appear anything that should not be there. The sun is coursing through a cloudless sky, and the plain, far as eye can reach, is without animate object upon it; neither bird nor beast having its home in the salitré. Nothing observable on that wide, cheerless waste, save the shadows of themselves and their horses, cast in dark silhouette across the hoary expanse, and greatly elongated; for it is late in the afternoon, and the sun almost down to the horizon.
“What is it?” asks Aguara, the first to speak, addressing himself to the Indian who gave out the cry. “You appear to apprehend danger?”