Allan himself felt hardly the strength to remain upright; but he forced himself to stand there, and with a tremendous effort held the glass true as it slowly scoured the sky-line to north and west.
All at once he uttered a choking cry. The glass shook in his wasted hands. His eyes, staring, refused their office, and a strange purple blur seemed to blot the horizon from his sight.
With the binoculars he stared at a point N. N. W., where he had thought to see the incredible apparition; but now nothing appeared.
"Hallucinations, so soon?" he muttered, rubbing his eyes. "Come, come, buck up! This won't do at all!"
And again he searched the place with his powerful lenses.
"My God! but I do see them--and they're real--they're moving, too!" he exclaimed. "No hallucination, no mirage! They're there! But--but what--What can this mean? Who can they be?"
Tiny and clear against the dazzling background of the afternoon sky he had perceived a long line of human figures trekking to southeast over the distant hill-top, almost directly toward the point where his exhausted troop now lay inert and panting.