“No more have I,” he said. “And I believe it’s a very rare occurrence. Now mark the mirage that showed itself to mademoiselle on the first day of the desert journey of the Parisians. She saw it on the northern verge of the oasis of Sidi-Okba, late in the afternoon. As they journeyed Tahar, their dragoman—he had applied for the post, and got it by the desire of mademoiselle, who admired his lithe bearing and gorgeous aplomb—Tahar suddenly pulled up his mule, pointed with his brown hand to the horizon, and said in French: “‘There is mirage! Look! There is the mirage of the great desert!’ “Our Parisians, filled with excitement, gazed above the pointed ears of their beasts, over the shimmering waste. There, beyond the palms of the oasis, wrapped in a mysterious haze, lay the mirage. They looked at it in silence. Then Mademoiselle cried, in her little bird’s clear voice: “‘Mirage! But surely he’s real?’ “‘What does mademoiselle see?’ asked Tahar quickly. “‘Why, a sort of faint landscape, through which a man—an Arab, I suppose—is riding, towards Sidi—what is it?—Sidi-Okba! He’s got something in front of him, hanging across his saddle.’ “Her relations looked at her in amazement. “‘I only see houses standing on the edge of water,’ said her sister. “‘And I!’ cried the husband. “‘Houses and water,’ assented Tahar. ‘It is always so in the mirage of Sidi-Okba.’ “‘I see no houses, no water,’ cried mademoiselle, straining her eyes. ‘The Arab rides fast, like the wind. He is in a hurry. One would think he was being pursued. Why, now he’s gone!’ “She turned to her companions. They saw still the fairy houses of the mirage standing in the haze on the edge of the fairy water. “‘But,’ mademoiselle said impatiently, ‘there’s nothing at all now—only sand.’ “‘Mademoiselle dreams,’ said Tahar. ‘The mirage is always there.’ “They rode forward. That night they camped near Sidi-Okba. At dinner, while the stars came out, they talked of the mirage, and mademoiselle still insisted that it was a mirage of a horseman bearing something before him on his saddle-bow, and riding as if for life. And Tahar said again: “‘Mademoiselle dreams!’ “As he spoke he looked at her with a mysterious intentness, which she noticed. That night, in her little camp-bed, round which the desert winds blew mildly, she did indeed dream. And her dream was of the magic forms that ride on magic horses through mirage. “The next day, at dawn, the caravan of the Parisians went on its way, winding farther into the desert. In leaving Sidi-Okba they left behind them the last traces of civilisation—the French man and woman who keep the auberge in the orange garden there. To-day, as they journeyed, a sense of deep mystery flowed upon the heart of mademoiselle. She felt that she was a little cockle-shell of a boat which, accustomed hitherto only to the Seine, now set sail upon a mighty ocean. The fear of the Sahara came upon her.” My companion paused. His face was grave, almost stern.