“We’ll get there in good season,” Cora was saying, when the engine gave a sudden combined cough, wheeze and sneeze, and stopped.

“No gasoline!” cried Walter.

“Indeed not!” answered Cora. “Both tanks are full.”

“Ground wire broken,” suggested Paul.

A hasty look at the conductors proved this theory to be wrong.

“Then it’s the carburetor,” Jack affirmed. “The worst possible place for trouble. I’ll look after it, Sis. I’ve had the dingus apart, and if anybody knows about its insides I do. Throw that anchor overboard, Wally, and I’ll tinker with the troublemaker.”

A small anchor splashed into the river, while Jack, putting on an old jumper and overalls, kept for such emergencies, took off the carburetor and proceeded to examine it, from cork float to butterfly valve.

“Must be poor gasoline they’re serving us lately,” he said. “It’s awfully dirty. Look!” and he held up his grimy hands.

“Have you found the trouble?” Cora asked.

“Yes, it was the air intake valve. Little speck of carbon in it prevented the proper mixture. I’ll have it fixed in a jiffy.”