There was another pause, then another start; but more ineffectual than before.

“You must let me push,” she said. “Or sound the horn for the keeper.”

“Wait!”

She waited; and he had another try, doing more harm than good.

“Sound the horn then, if you won’t let me push,” she said.

“Hell! Be quiet a moment!”

She was quiet a moment: he made shattering efforts with the little motor.

“You’ll only break the thing down altogether, Clifford,” she remonstrated; “besides wasting your nervous energy.”