"And what's that below it--the black patch? Stones or scrub?" Colin was in a day-dream. "Why do you call it black? It's blue, quite blue." "Rot," said the other. "It's grey-black." "No, it's water with the sun shining on it. It's blue, but just at the edges it's very near sea-green." Bellew rose excitedly. "Hullo, Col, you're seeing the mirage! And you the fittest of the lot of us! You've got the sun in your head, old man!" "Mirage!" Colin cried in contempt. He was awake now, but the thought of confusing his own bright western sea with a mirage gave him a curious pain. For a moment he felt the gulf of separation between his two worlds, but only for a moment. As the party remounted he gave his fancies the rein, and ere he reached camp he had felt the oars in his hand and sniffed the apple-tree blossom from the distant beaches. The major came to him after supper. "Bellew told me you were a bit odd to-day, Colin," he said. "I expect your eyes are getting baddish. Better get your sand-spectacles out." Colin laughed. "Thanks. It's awfully good of you to bother, but I think Bellew took me up wrong. I never was fitter in my life." * * * * * * * By-and-by the turn came for pride to be humbled. A low desert fever took him, and though he went through the day as usual, it was with dreary lassitude; and at night, with hot hands clasped above his damp hair, he found sleep a hard goddess to conquer. It was the normal condition of the others, so he had small cause to complain, but it worked havoc with his fancies. He had never been ill since his childish days, and this little fever meant much to one whose nature was poised on a needle-point. He found himself confronted with a hard bare world, with the gilt rubbed from its corners. The Rim of the Mist seemed a place of vague horrors; when he reached it his soul was consumed with terror; he struggled impotently to advance; behind him Cuna and the Acharra coast seemed a place of evil dreams. Again, as in his old fever, he was tormented with a devouring thirst, but the sea beside him was not fresh, but brackish as a rock-pool. He yearned for the apple-tree beaches in front; there, he knew, were cold springs of water; the fresh smell of it was blown towards him in his nightmare. But as the days passed and the misery for all grew more intense, an odd hope began to rise in his mind. It could not last, coolness and health were waiting near, and his reason for the hope came from the odd events at the Rim of Mist. The haze was clearing from the foreground, the surf-lined coast seemed nearer, and though all was obscure save the milk-white sand and the foam, yet here was earnest enough for him. Once more he became cheerful; weak and light-headed he rode out again; and the major, who was recovering from sunstroke, found envy take the place of pity in his soul.