Smoke was issuing from the motor-boat, coming from some over-heated oil.
He leaped to the next high rock, and then plunged boldly forward, soon gaining the bow of the craft. At the stern the propeller was churning the water into a white foam. The craft was trembling violently, and the hum of the machinery gave full evidence of the power it was exerting.
Fortunately, Dave's knowledge of gasoline engines now stood him in good stead, and without the loss of a second he turned off the supply of gasoline and the electric spark, and thus allowed the engine to "die." As the propeller slowed up and stopped, the water behind the craft calmed down, and then the pounding on the rocks was reduced to a gentle rub that did little but scratch the paint.
"Is she all right, Dave?" called out Roger, who stood on the rocks of the bank watching proceedings with great interest.
"I think so, although it hasn't done the engine any good to run wild. She's pretty well heated up, and the cylinders may be carbonized, or something like that."
"What are you going to do—try to run her in here?"
"No, I'll not take the risk. I only wanted to stop the engine and get rid of the risk of the boat blowing up."
