She opened her mouth as if to say something. But at that moment an electric gong began to ring furiously, so loud that it vibrated loudly in Ralph's laboratory, four thousand miles away.

Immediately her countenance changed, and the smile in her eyes gave way to a look of terror.

"What is that?" Ralph asked sharply.

"An avalanche! It's just started—what shall I do, oh, what shall I do! It'll reach here in fifteen minutes and I'm absolutely helpless. Tell me—what shall I do?"

The mind of the scientist reacted instantly.

"Speak quick!" he barked. "Is your Power Mast still up?"

"Yes, but what good—?"

"Never mind. Your wave length?"

".629."

"Oscillatory?"