gently at first, and then stronger and stronger. Evidently a storm was in the air.
"We are going to catch it!" was Tom's comment.
"Oh, I don't think it will storm just yet," returned Sam.
"Watch yourself, Sam!" cried Dick, warningly. "If the wind gets too strong bring her down in the first field we come to."
"I will," was the answer.
They were now flying close to the railroad tracks. Presently they saw a glare of light illuminate the rails and a long line of freight cars, drawn by a big locomotive, passed beneath them.
"Wish that was going our way—we could follow it with ease," said Sam, as the train disappeared from view, leaving the landscape below darker than ever.
The youngest Rover boy now had to give the Dartaway all of his attention. The breeze was coming in fitful gusts, sending the biplane first to one side and then to the other. They struck a "bank," and he had to use all his wit and courage to bring the flying machine to a level keel once more.
"Better go down!" cried Tom. "This is getting dangerous."
