Tubby pointed to the road on the outskirts of the village, where a big torpedo-bodied auto was drawn up. In it was seated a man of past middle age, with iron-gray hair and keen eyes, who was watching the boys closely as they came toward him.

As they drew nearer he got out of the car and addressed the chauffeur.

“You needn’t wait for me, Manning. I’ll walk home,” he said.

CHAPTER IX.
FIRE!

“A most remarkable story; but I happen to know certain things that fit in with it in every way. Boys, you have done me a great service to-day.”

Mr. Mainwaring paused as he spoke and looked kindly and admiringly at the three Boy Scouts who had unfolded to him the story of their experiences at the old barn. The tale had been told as they strolled along the road leading to the engineer’s home, on a hill outside Hampton.

It had occupied some time in the telling, and dusk was drawing in so that, much against their will, the boys were compelled to decline Mr. Mainwaring’s invitation to visit his library and see some interesting drawings and data relating to the Panama Canal. But they made an engagement to come at some other time and hear from the great engineer about some of the wonders that had been accomplished in the magic land lying nine degrees north of the equator—a land which, so far as the Canal Zone is concerned, has been turned by Uncle Sam’s canal commission into a land as healthful as any, if due precautions are observed.

It was almost dark as the boys hastened on their homeward way. There was a meeting called in the Eagle rooms over the bank that night, and they were all three in a hurry to get home and change and eat supper. As they walked along at a brisk pace, the conversation naturally was chiefly concerned with the topic which they had just been discussing with Mr. Mainwaring.

“I wonder what he’ll do about it?” said Merritt.

“Well, as he said, it’s a mighty delicate matter as things are now,” rejoined Rob. “To make a hasty move might force the plotters to rush things before any precaution could be taken against them. Even to take Jared before the authorities might be premature, so Mr. Mainwaring said. I gathered, in fact, that he means to let matters lie quiet for a time and watch every move of those whom he suspects.”