“What were they?”

“Someone was very much interested in keeping us out of the race,” explained the young airman.

“You mean professional rivals?”

“I won’t say that positively,” responded Dave, “although expert airmen certainly shared in the Washington end of the plot. I cannot doubt that instructions were sent to confederates here at Chicago to catch the Comet and finish the work.”

“You can’t name any one in this outrage; can you, Dashaway?” inquired the superintendent, roused up to a high pitch of excitement and indignation.

“I have a suspicion as to the person at the bottom of the scheme,” answered Dave. “I have a further idea as to the men who are carrying out instructions, but I have no positive proof as to their guilt. Neither of them is probably here. No, they must have wired accomplices at this point. All I can say is, that hired emissaries in a big plot to keep us out of this race are probably posted and instructed all along the line, determined to carry out their plan to prevent our making the world-circling flight.”

“I must report this to the officers of the association at once, Dashaway,” said the superintendent.

Hiram had sidled up to Dave. He seized the arm of the latter in a detaining grip as he was about to move nearer to the ruins of the hangar.

“See here, Dave Dashaway,” he said, earnestly, “there’s a lot you are keeping to yourself, and I’ve a right to know what it is.”

“I think so, too,” replied the young airman at once. “I saw no good accomplished by worrying you with that I only guessed, until this explosion occurred. Now I feel it a duty to share my knowledge with you and Elmer, just as you are sharing the risk and danger of this journey. As soon as we get started again, I will have an interesting story to tell you.”