“Who can it be—­there’s a lot of them,” murmured Ned.

Tom did not answer.  Instead he silently sped back to where they had slept and got his automatic revolver.

“Better get yours,” he said to his companions.  “It may be a rescue party, though I don’t see how any one could know we were in here, or it may be—­”

He did not finish.  They all knew what he meant, and a moment later four strained and anxious figures stood on the inner side of the stone door, revolvers in hand, awaiting what might be revealed to them.  Would it be friend or foe?

At Tom’s feet lay the golden head—­the hollow head of the statue.  The scene was illumined by a flickering gas torch—­the last one, as the others had burned out.

Slowly the stone went up, very slowly, for it was exceedingly heavy and the mechanism that worked it was primitive.  Up and up it went until now a man could have crawled under.  Ned made a motion as if he was going to do so, but Tom held him back.

Slowly and slowly it went up.  On the other side was a very babble of voices now—­voices speaking a strange tongue.  Tom and his companions were silent.

Then, above the other voices, there sounded the tones of some one speaking English.  Hearing it Tom started, and still more as he noted the tones, for he heard this said: 

“We’ll be inside in a minute, dad, and I guess we’ll show Tom Swift that he and his crowd can’t fool us.  We’ve got to the city of gold first!”

“Andy Foger!” hoarsely whispered Tom to Ned.

The next moment the stone gate went up with a rush, and there, in the light of the gas torch, and in the glare of many burning ones of wood, held by a throng of people on the other side, stood Andy Foger, his father, Delazes, and a horde of men who looked as wild as savages.

For a moment both parties stood staring at one another, too startled to utter a sound.  Then as Tom noticed that some of the natives, who somewhat resembled the ancient Aztecs, had imitation human heads stuck on the ends of poles or spears, he uttered two words;

“Head-hunters!”

Like a flash there came to him the warning of the African missionary:  “Beware of the head-hunters!” Now they were here—­being led on by the Mexican and the Fogers—­the enemies of our friends.

For another moment there was a silence, and then Andy Foger cried out: 

“They’re here!  Tom Swift and his party!  They got here first and they may have all the gold!”

“If they have they will share it with us!” cried Delazes fiercely.

“Quick!” Tom called hoarsely to Ned, Mr. Damon and Eradicate.  “We’ve got to fight.  It’s the only way to save our lives.  We must fight, and when we can, escape, get to the airship and sail away.  It’s a fight to the finish now.”

He raised his automatic revolver, and, as he did so one of the savages saw the golden head of the statue lying at Tom’s feet.  The man uttered a wild cry and called out something in his unknown tongue.  Then he raised his spear and hurled it straight at our hero.