Marching Sands
retorted warmly. "This is, literally, a sea of sand. And the waves are rising. We are sure that certain towns in the foothills of the Thian Shan have been buried by these waves. You see, the prevailing winds here are from the east. They drive the sand dunes before them. I have noted that the dunes march westward"
"Before you go on, Sir Lionel" protested the American, remembering his intention to make a clean breast of things.
"Not a word, sir. Not another word. Be quiet, Mary"—as the girl started to speak—"I will not be contradicted. It is a scientific fact that the sands march. During the kara burans or black wind-storms they will progress many feet a day. Sungan was built on the great caravan route from China to Samarcand and Persia, many centuries ago. Marco Polo followed this route when he visited the court of Kubla Khan."
"But," Gray broke in, "I want"
"I say, it is a fact, sir. Prove the contrary. You can't!" Sir Lionel glared at him hostilely. "I am right. Without doubt, I am correct. Sungan has been buried by the marching sands. Only the towers remain."
Gray thought of the tale Delabar had mentioned—of the sand that came down on the city of the Gobi, as retribution for some sin against the religions of Asia. Also, Mirai Khan had said no city
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