“You don’t wish to smash the biplane so soon. You will have enough tumbles without his help. If you are ready you may try it again.”

By this time Harvey had become somewhat accustomed to the sensitiveness of the machine. It required slighter movements of the lever than he had supposed and the response was sometimes quicker than he expected. He understood what his instructor meant by insisting that an aviator should become familiar with his machine.

Bohunkus was asked to hold the rear of the aeroplane until the revolving propeller acquired more velocity. The dusky youth buried his heels in the dirt and held the framework with might and main. The pull rapidly increased, while he put forth all his strength, which was considerable. The Professor gave no help, but trying to keep his face straight, watched things. Despite all he could do, Bunk was compelled to yield a few inches. He still resisted desperately, but while he could not add to his power, the uproarious motor fast did so. Suddenly it made a bound forward, and Bunk sprawled on his face, with his cap flying off. His hold had slipped and the machine shot forward with a speed far greater than any one of the three could have reached.

“Hang de ole thing!” exclaimed Bunk, climbing to his feet and brushing the dust from his clothes; “what’s de use ob it yanking a feller like dat?”

The roaring motor was too near for either of his friends to understand his words, but it was easy to imagine their substance.

When Harvey had completed his circuit of the field, Bunk asked that he might try his hand. He certainly was not lacking in assurance, but the Professor would not consent.

“You might do well, but the chances are you would not. You will get your chance after a time. You may ride with Harvey if you wish.”

With some hesitation, Bunk climbed into the seat behind his friend.

“Am yo’ gwine to go up?” he asked.

“Not at present. Why do you wish to know?”