They came to the end of a cable fastened above one of these white windows, dimly visible and dropping into impenetrable shadows.

Suddenly his hand came against his guide's.

"_Still_!" whispered the latter very softly.
He looked up with a start and saw the huge wings of the flying machine gliding slowly and noiselessly overhead athwart the broad band of snow-flecked grey-blue sky.

In a moment it was hidden again.
"Keep still; they were just turning." For awhile both were motionless, then Graham's companion stood up, and reaching towards the fastenings of the cable fumbled with some indistinct tackle.
"What is that ?" asked Graham.
The only answer was a faint cry.

The man crouched motionless.