"Great!" exclaimed Ken Ward.
"It's all so different from Arizona," said Hal.
At Tamos, twelve miles out of Tampico, the train entered the jungle. Thereafter the boys could see nothing but the impenetrable green walls that lined the track. At dusk the train reached a station called Las Palmas, and then began to ascend the first step of the mountain. The ascent was steep, and, when it was accomplished, Ken looked down and decided that step of the mountain was between two and three thousand feet high. The moon was in its first quarter, and Ken, studying this tropical moon, found it large, radiant, and a wonderful green-gold. It shed a soft luminous glow down upon the sleeping, tangled web of jungle. It was new and strange to Ken, so vastly different from barren desert or iron-ribbed cañon, and it thrilled him with nameless charm.
The train once more entered jungle walls, and as the boys could not see anything out of the windows they lay back in their seats and waited for the ride to end. They were due at Valles at ten o'clock, and the impatient Hal complained that they would never get there. At length a sharp whistle from the engine caused Pepe to turn to the boys with a smile.
"Valles," he said.
With rattle and clank the train came to a halt. Ken sent George and Pepe out, and he and Hal hurriedly handed the luggage through the open window. When the last piece had been passed into Pepe's big hands the boys made a rush for the door, and jumped off as the train started.
"Say, but it's dark," said Hal.
As the train with its lights passed out of sight Ken found himself in what seemed a pitchy blackness. He could not see the boys. And he felt a little cold sinking of his heart at the thought of such black nights on an unknown jungle river.
IV
AT THE JUNGLE RIVER