"Nothin'," answered Buck, gradually relaxing from his first show of suspicion. "I'm beating it. That's all."

"Leaving us?"

"Yes."

"Not really!"

"D'you think I ought to stay?" asked Buck, with something of a sneer.

The doctor hesitated, frowning in a puzzled way. At length he threw out his hands in a gesture of mute abandonment.

"My dear fellow," he said with a faint smile, "I've about stopped trying to think."

At this Buck Daniels grinned mirthlessly.

"Now you're talkin' sense," he nodded. "They ain't no use in thinking."

"But why do you leave so suddenly?"