CHAPTER XV 

A RUNAWAY MOTOR-BOAT 

"What do you make of that?" 

"The motor-boat must have run away from Nat!" 

"Either that or Nat has fallen overboard!" 

"Maybe Nat has been drowned!" 

These and other remarks were made, as the boys on the highway gazed down at the craft that was speeding along in such an erratic fashion over the surface of the river. A closer look confirmed their first opinion, that nobody was on board. 

"I'm going to try to stop her!" shouted Dave, and ran back along the highway, and disappeared into the bushes. Roger followed him closely, and some of the others trailed behind. 

"I am going up the river--to see if I can find Nat!" shouted Phil, and away he sped, and Sam and Ben went along. 

It was no easy matter for Dave to work his way down the bank of the stream. The bushes were thick and the footing uncertain, and once his jacket caught on a root and he had to pause to free himself. But at last he came out on a narrow strip of rocks and sand, at a point where the Leming River made a broad turn. 

The water at this point was quite shallow, and here he thought the progress of the motor-boat would be stayed. His surmise was correct, the craft bringing up between several smooth rocks. The engine continued to work, pounding the boat back and forth, and threatening to sink her. 

Fortunately, Dave had on a pair of gaiters he had borrowed, and they were so big that he slipped them off with ease. His socks followed, and then he rolled up his trousers to his knees, and waded into the stream. 
What was the body of water called?
"I am going up the river