“The worst of it is that it’s going to take a mint of money,” sighed the young inventor. “That’s why I’m calling on you and some of my other friends to take stock, Mr. Damon. How does it strike you?”

To the credit of Mr. Damon be it said that he did not hesitate a moment. He held out his hand to his friend and said:

“I’m with you, Tom Swift! I’ll invest all I can afford. I wish it was more, but I’ve spent a lot on that new aeroplane of mine that I nearly smashed. However, I have a few dollars left in the bank. Though you needn’t say anything to my wife about this,” he went on in a low voice as he got out his checkbook.

Tom and Ned smiled as they gave a promise of secrecy, and a little later the young inventor left with his first contribution toward financing the airline express—a check for five thousand dollars.

Tom Swift spent busy days during the next few weeks. Like all new enterprises, this one was not easy to start, though many of Tom’s friends, whom he approached with a plea that they buy stock which would pay big dividends if the plan succeeded, at once purchased blocks. Others required more persuasion, and not a few said they would buy stock if they could see the machines in operation.

“That’s what we’ve got to do, Ned,” decided the young inventor, when it was evident that the enterprise might fail through lack of capital. “We’ve got to show these Missouri birds that we can fly this combined auto and aeroplane. Gee, I’m sorry now Dad and I have all our ready money tied up in those other matters.”

“But can you build a trial machine?” asked the treasurer of the Swift concern.

“I can as soon as my patent papers come through from Washington,” Tom said. “That’s where the hitch is now. After all the machines we have made in our plant, it would be queer if we couldn’t build a speedy aeroplane of extra power and also a chassis to clamp on to carry the passengers. That’s where the patent comes in—the method of combining the two.”

“But I understood that the patents had been allowed,” said Mr. Damon, who was present. “That was the latest advice from your Washington lawyer.”

“Yes, I know. But several matters have come up since then. Some one is trying to throw a monkey wrench into the gear wheels, so to speak, and I suspect it is the same gang that tried to put me out of the way—the scoundrels headed by Schlump and Kenny. I think I shall have to make a trip to Washington myself.”