Still without moving he opened his eyes.

The oil lamp which he had put out on retiring was burning low.

In its dim light stood the doctor, half dressed, in a tense attitude of listening.
"What's the matter ?" asked Philip.
The professor started, and turned toward the stove.
"Nervousness, I guess," he said gloomily.

"I was afraid I would awaken you.

I've been up three times during the last hour--listening for a voice." "A voice ?" "Yes, back there in the bunk I could have sworn that I heard it calling somewhere out in the night.