“So you never heard of the Seuen-H’sin—‘The Sect of the Two Moons’? Then I will tell you: the Seuen-H’sin are the sorcerers of China, and the most murderously diabolical breed of human beings on this earth! They are the makers of these earthquakes that are aimed to wreck our world!”

The astronomer’s declaration so dumfounded me that I could only stare at him, wondering if he were serious.

“The Seuen-H’sin are sorcerers,” he repeated presently, “whose devilish power is shaking our planet to the core. And I say to you solemnly that this ‘KWO’—who is Kwo-Sung-tao, high priest of the Seuen-H’sin—is a thousand times more dangerous than all the conquerors in history! Already he has absolute control of a hundred millions of people—mind and body, body and soul!—holding them enthralled by black arts so terrible that the civilized mind cannot conceive of them!”

Dr. Gresham leaned forward, his eyes shining brightly, his voice betraying deep emotion.

“Have you any idea,” he demanded, “what goes on in the farthermost interior of China? Has any American or European?

“We read of a republic superseding her ancient monarchy, and we meet her students who are sent here to our schools. We hear of the expansion of our commerce along the jagged edges of that great Unknown, and we learn of Chinese railroad projects fostered by our financiers. But no human being in the outside world could possibly conceive what takes place in that gigantic shadow land—vague and vast as the midnight heavens—a continent unknown, impenetrable!

“Shut away in that remote interior—in a valley so little heard of that it is almost mythical—beyond trackless deserts and the loftiest mountains on the globe—this terrible sect of sorcerers has been growing in power for thousands of years, storing up secret energy that some day should inundate the world with horrors such as never have been known!

“And yet you never heard of the Seuen-H’sin! No; nor has any other Caucasian, except, perhaps, a chance missionary or two.

“But I tell you I have seen them!”

Dr. Gresham was becoming strangely excited, and his voice rose almost shrilly above the roar of the train.