Machinery?” the doctor shot out quickly. “What kind of machinery?”

I drew from my pocket the penciled notes I had made at the newspaper office and glanced over the items.

“Some electrical equipment,” I answered. “Dynamos, turbines, switchboards, copper cable—all such things—for a hydro-electric plant near Hong-kong.”

“Ah!” exclaimed the doctor in elation. “I was sure of it! We may be getting at the mystery at last!”

Seizing the memoranda, he ran his eyes hurriedly down the list of items. Profound confidence marked his bearing when he turned to Professor Whiteman a moment later and said:

“I must obtain an immediate audience with the President of the United States. You know him personally. Can you arrange it?”

Professor Whiteman could not conceal his surprise.

“Concerning these earthquakes?” he inquired.

“Yes!” my friend assured him.

The astronomer looked at his colleague keenly.