Chapter III. A Face at the Window

"What is the matter?" asked Mr. Damon, catching the glance between Tom and the contractor. "Is there anything wrong with South America--Peru? I know they have lots of revolutions in those countries, but I don't believe Peru is what they call a 'banana republic'; is it?"

"No," and Mr. Titus shook his head. "It isn't a question of revolutions."

"But it's something!" insisted Mr. Damon. "Bless my ink bottle! but it's something. As soon as I mention Peru, Tom, you and Mr. Titus eye each other as if I'd said something dreadful. Out with it! What is it?"

"It's just--just a coincidence," Tom said. "But go on, Mr. Damon. Finish what you have to say and then we'll explain."

"Well, I guess I've told you all you need to know for the present. I went into this wholesale drug concern, hoping to make some money, but now, on account of the trouble down in Peru, we stand to lose considerable unless I can get back the cinchona concession."

"What does that mean?" Tom asked.

"Well, it means that our concern secured from the Peruvian government the right to take this quinine-producing bark from the trees in a certain tropical section. But there has been a change in the government in the district where our men were working, and now the privilege, or concession, has been withdrawn. I'm going down to see if I can't get it back. And I want you to go with me."

"And I came here for very nearly the same thing," went on Mr. Titus. "That is where the coincidence comes in. It is strange that we should both appeal to Mr. Swift at the same time."

"Well, Tom's a valuable helper!" exclaimed Mr. Damon. "I know him of old, for I've been on many a trip with him."

"This is the first time I have had the pleasure of meeting him," resumed the tunnel contractor, "but I have heard of him. I did not ask him to go to South America for us. I only wanted to get some superior explosive for my brother, who is in charge of driving the railroad tunnel through a spur of the Andes. I look after matters up North here, but I may have to go to Peru myself.

"As I told Mr. Swift, I had read of his invention of the giant cannon and the special powder he used in it to send a projectile such a distance. The cannon is now mounted as one of the pieces of ordnance for the defense of the Panama Canal, is it not?" he asked Tom.

The young inventor nodded in assent.

"Having heard of you, and the wonderful explosive used in your big cannon," the contractor went on, "I wrote to my brother that I would try and get some for him.

"You see," he resumed, "this is the situation. Back in the Andes Mountains, a couple of hundred miles east of Lima, the government is building a