"We are witnesses."
"Good! We escaped with our lives, but we brought little of the treasure with us. I was determined to find the way back there, and I made a map. See, here it is."
He thrust a soiled and crumpled piece of paper into Frank's hand, and the boy saw there were lines and writing on it.
"How we found our way out of the mountains, how we endured the heat of the desert I cannot tell," went on the weak voice of the man on the bed of straw. "We reached Zacatecas, and then Bushnell went for another balloon. He knows friends who have money and power, and he will get the balloon—if he lives."
"But the proof—the proof that you were going to show us?"
"It is here! Look!"
From beneath the straw Jack Burk drew forth a queer little figure of solid gold—a figure like the pictures of Aztec gods, which Frank had seen.
"This is proof!" declared the man. "It is some of the treasure we brought from the palace. Bushnell took the rest."
The professor excitedly grasped the little image, and gazed searchingly at it.
"It is all right—it is genuine!" he finally exclaimed.
"Of course it is genuine!" said the man on the bed of grass. "And there are more in the Silver Palace. There the treasures of the Aztecs were hidden, and they have remained. The country all around is full of fierce natives, who hold the palace in awe and prevent others from reaching it. They have kept the secret well, but——"
"Vot vos dot?" interrupted Hans.
At some distance on the plain outside the hut were wildly galloping horses, for they could hear hoof-beats and loud cries. Then came a fusillade of pistol shots!
"Frank began shooting, and his first bullet brought down one of the ponies of the pursuers."
CHAPTER II.
GONE
"Bandits!" cried Jack Burk. "It may be Pacheco!"
"Pacheco?" questioned Frank.
"Pacheco, the human hawk! He haunts the mountains and the desert. He pursued us across the desert, but we escaped him. I have been in hiding here to avoid him. He believes we brought much treasure from the mountains."
The professor had leaped to the door, and was looking away on the plain. Now he cried, excitedly:
"Look here! A band of horsemen pursuing a white man—plainly an American. Look, he is shooting again!"
Once more the shots were heard.
Frank ran to the door, catching up a rifle that had been leaning against the wall of the hut, for he knew he was in a "bad man's land."
"Stand aside!" he shouted, forcing his way past the professor. "No countryman of mine can be in danger that I do not try to give him a helping hand."
"What do you mean to do?"
"Get a crack at those Greasers."
"You are crazy! You will bring the entire band down on us!"
"Let 'em come! One Yankee is good for six Greasers."
Past the hut at a distance a single horseman was riding, hotly spurring the animal which bore him. At least a dozen dark-faced, fierce-looking ruffians, mounted on hardy little ponies, were in pursuit.
As Professor Scotch had said, the fugitive was plainly an American, a native of the United States. He had turned in the saddle to send bullets whistling back at his pursuers.
Frank ran out and dropped on one knee. The professor followed him, and Hans came from the hut.
Just as Frank lifted the rifle to his shoulder and was on the point of shooting, the voice of Jack Burk sounded from the doorway, to which he had dragged himself:
"It is Bushnell, my partner! Al! Al! Al Bushnell!"
His voice was faint and weak, and it did not reach the ears of the man out on the plain.
Then Frank began shooting, and his first bullet brought down one of the ponies of the pursuers, sending a bandit rolling over and over in the dust, to leap up like a cat, and spring behind a comrade on the back of another pony.
"Dot peen britty goot, Vrankie," complimented Hans Dunnerwust.
Again and again Frank fired, and the bandits quickly swerved away from the hut, feeling their ponies sway or fall beneath them.
In an astonishingly brief space of time the course of pursuit was deflected, giving the fugitive a chance to get away into Mendoza, which lay at a distance of about three miles from the hut.
The man in flight heard the shots, saw the figures in front of the hut, and waved his hand to them.
The professor excitedly beckoned for Bushnell to come to the hut, but the horseman did not seem to understand, and he kept straight on toward the town.
"Confound him!" exploded the professor. "Why didn't he come?"
"He don'd like a trap to run into," said Hans.
"But there is no trap here."
"How he known dot?"
"Well, I don't know as I blame him. Of course he could not be sure it was not a trap, and so he was cautious."
Frank was calmly refilling the magazine of the rifle with fresh cartridges.
"Why you didn't shoot some uf der pandits deat, Vrankie?" asked Hans.
"I do not wish to shed human blood if I can avoid it."
"You don't done dot uf you shoot six or elefen uf dose togs."
"Oh, they are human beings."
"Don't you belief me? Dey vos volves—kiotes."
"Well, I did not care to shoot them if I could aid the man in any other way, and I succeeded. See, they have given up the pursuit, and the fugitive is far away in that little cloud of dust."
"Frank!"
"Yes, professor."
"We should follow him, and bring him back to his dying partner."
"And leave Jack Burk here alone—possibly to die alone?"
"We can't do that."
"Of course not."
"What then?"
"We'll have to consider the matter. But Burk—— Look—see there, professor! He is flat on his face in the doorway! He fell like that after trying to shout to his partner."
Frank leaped forward, and turned the man on his back. It was a drawn, ghastly face that the trio gazed down upon.
Professor Scotch quickly knelt beside the motionless form, feeling for the pulse, and then shaking his head gravely.
"What is it?" anxiously asked Frank. "Has he——"
He was silent at a motion from the professor, who bent to listen for some movement of the man's heart.
After a few seconds, Professor Scotch straightened up, and solemnly declared:
"This is the end for him. We can do nothing more."
"He is dead?"
"Yes."
There was an awed hush.
"Now we can leave him," the professor finally said. "Pacheco, the bandit, cannot harm him now."
They