The same Bedouin, who had previously conversed with Idris, spoke out again in a strange and as if not his own voice:
"This will not be a usual wind. Evil charms are pursuing us. The snake is to blame for all—"
"I know," answered Idris.
"Look! the air quivers. That does not happen in winter."
In fact the heated air began to quiver, and in consequence of an illusion of the eyes it seemed to the riders that the sands quivered. The Bedouin took his sweaty cowl from his head and said:
"The heart of the desert beats with terror."
And at this the other Bedouin, riding in the lead as a guide of the camels, turned around and began to shout:
"He is already coming!—He is coming!"
And in truth the wind came up. In the distance appeared as it were dark clouds which in their eyes grew higher and higher and approached the caravan. The nearest waves of air all around became agitated and sudden gusts of wind began to spin the sand. Here and there funnels were formed as if someone had drilled the surface of the desert with a cane. At places rose swift whirlpools resembling pillars, thin at the bottom and outspread on top like plumes of feathers. All this lasted but the twinkling of an eye. The cloud which the camel-guide first espied came flying towards them with an inconceivable velocity. It struck the people and beasts like the wing of a gigantic bird. In one moment the eyes and mouths of the riders were filled with sand. Clouds of dust hid the sky, hid the sun, and the earth became dusky. The men began to lose sight of one another and even the nearest camel appeared indistinctly as if in a fog. Not the rustle—for on the desert there
