He stopped suddenly, for Tom, who was in the lead, had uttered a cry. It was a cry of joy, there was no mistaking that, and instinctively they all knew that he had found what he had sought.

All confirmed it a moment later, for, as they rushed forward, they discovered Tom standing at the place where the tunnel broadened out--broadened out into a great cave, a cave miles in extent, for all they could tell, as their lamps, powerful as they were, only illuminated for a comparatively short distance.

"We're here!" cried Tom. "In the city of gold at last!"

"The city of gold!" added Ned. "The underground city of gold!"

"And gold there is!" fairly shouted Mr. Damon. "See it's all over! Look at the golden streets--even the sides of the buildings are plated with it--and see, in that house there are even gold chairs! Boys, there is untold wealth here!"

"An' would yo' all look at dem golden statues!" cried Eradicate, "dey mus' be millions ob 'em! Oh, golly! Ain't I glad I comed along!" and he rushed into one of the many houses extending along the street of the golden city where they stood, and gathered up a fairly large statue of gold--an image exactly similar to the one he already had, except as to size.

"I never would have believed it possible!" gasped Tom. "It's a city of almost solid gold. We'll be millionaires a million times over!"

Chapter XXI The Big Image

Could the light of day have penetrated to that mysterious and ancient underground city of gold our friends might have had some idea of its magnificence. As it was they could only view small parts of it at a time by the illumination of their electric torches. But even with them they saw that it was a most wonderful place.