“Somebody with rubber-soled tennis shoes has been walking up here,” he said.
He bent closer over the footprints, and then he saw another mark that caused him to spring up quickly, and call to his companions and the policeman.
“Look here!” he cried, beckoning to them.
“What’s the matter?” demanded Ned, coming up on the run.
“Easy! Easy!” cautioned Jerry. “Don’t trample on these marks. Look! If some one hasn’t been up here on a bicycle I miss my guess!”
“A bicycle!” exclaimed Bob. “Do you mean to say that the robbers rode a bicycle up here?”
“There are the marks of the rubber tires plain enough,” replied Jerry, pointing to them.
“That’s no bicycle track!” declared Ned.
“Why not?” the tall lad wanted to know.
“Or, if it is, the fellow rode on one wheel, or else is more expert than anyone I ever saw. See, there’s only one straight mark, and the best rider in the world turns his front wheel every now and then, making a separate track from the rear one. That’s no bicycle mark.”