rear of the pursuing and attacking party, had just emerged from the hole by the great stone altar when there suddenly spouted from the same opening a solid column of water. A cry of wonder came from all as they saw the strange sight. A veritable geyser was now spurting in the very middle of the temple floor, and the head-hunters, the Mexicans and the Fogers ran screaming to get out of the way.
"Look!" cried 'Ned. "What happened?"
"The underground river must be running the wrong way!" answered Tom, as he prepared to set in motion the motor. "Either they accidently turned some hidden lever, or when they raised the stone door they did it. The tunnel is flooded and"
"Bless my match box! So is the underground city!" cried Mr. Damon. "I guess we've seen the last of it and its gold. We were lucky to escape with our lives, and those fellows might have been drowned like rats in a trap, if they hadn't followed us. The underground city will never be discovered again."
"And now for home!" cried Tom, when they had eaten and drunk sparingly until they should get back their strength, and had seen to their slight wounds.
"And our trip wasn't altogether a failure,"
