Brave as she was, the girl now hung back behind Dodd, letting the two men take precedence of her. The water, saline as it was, had partly quenched their thirst. They felt their strength reviving.

And it was growing light. In the east the sky was already flecked with yellow pink. They felt a thrill of intense excitement at the prospect of meeting others of their kind.

"Where do you think we are?" asked Tommy.

Dodd stopped to look at a shrub that was growing near the edge of the pool. "I don't think, I know, Tommy," he answered. "This is wattle."

"Yes?"

"We're somewhere in the interior regions of the Australian continent--and that's not going to help us much."

"Over there--over there," panted Haidia. "Hold me, Jimmydodd. I can't see. Ah, this terrible light!"

She screwed her eyelids tightly together to shut out the pale light of dawn. The men had already discovered that the third membrane had been burned away.

"We must get her out of here," whispered Dodd to Tommy. "Somewhere where it's dark, before the sun rises. Let's go back to the entrance of the crater."

But Haidia, her arm extended, persisted, "Over there! Over there!"

Suddenly a spear came whirling out of a growth of wattle beside the pool. It whizzed past Tommy's face and dropped into the sand behind.

Between the trunks of the wattles they could see the forms of a party of blackfellows, watching them intently.

Tommy held up his arms and moved forward with a show of confidence that he was far from feeling. After what he had escaped in the underworld he was in no mood to be ma.s.sacred now.

But the blacks were evidently not hostile. It was probable that the spear had not been aimed to kill. At the sight of the two white men, and the white woman, they came forward doubtfully, then more fearlessly, shouting in their language. In another minute Tommy and Dodd were the center of a group of wondering savages.

Especially Haidia. Three or four gins, or black women, had crept out of the scrub, and were already examining her with guttural cries, and fingering the hair garment that she wore.

"Water!" said Tommy, pointing to his throat, and then to the pool, with a frown of disgust.

The blackfellows grinned, and led the three a short distance to a place where a large hollow had been scooped in the sandy floor of the desert.

It was full of water, perfectly sweet to the taste. The three drank gratefully.

Suddenly the edge of the sun appeared above the horizon, gilding the sand with gold. The sunlight fell upon the three, and Haidia uttered a terrible cry of distress. She dropped upon the sand, her hands pressed to her eyes convulsively. Tommy and Dodd dragged her into the thickest part of the scrub, where she lay moaning.

They contrived bandages from the remnants of their clothing, and these, damped with cold water, and bound over the girl's eyes, alleviated her suffering somewhat. Meanwhile the blackfellows had prepared a meal of roast opossum. After their long diet of shrimps, it tasted like ambrosia to the two men.

Much to their surprise, Haidia seemed to enjoy it too. The three squatted in the scrub among the friendly blacks, discussing their situation.

"These fellows will save us," said Dodd. "It may be that we're quite near the coast, but, any way, they'll stick to us, even if only out of curiosity. They'll take us somewhere. But as soon as we get Haidia to safety we'll have to go back along our trail. We mustn't lose our direction. Suppose I was laughed at when I get back, called a liar! I tell you, we've got to have something to show, to prove my statements, before I can persuade anybody to fit out an expedition into Submundia.

Even those three beetle-sh.e.l.ls that we dropped in the crater won't be conclusive evidence for the type of mind that sits in the chairs of science to-day. And, speaking of that, we must get those blacks to carry those sh.e.l.ls for us. I tell you, n.o.body will believe--"

"What's that?" cried Tommy sharply, as a rasping sound rose above the cries of the frightened blacks.

But there was no need to ask. Out of the crater two enormous beetles were winging their way toward them, two beetles larger than any that they had seen.

Fully seven feet in length, they were circling about each other, apparently engaged in a vicious battle.

The fearful beaks stabbed at the flesh beneath the sh.e.l.ls, and they alternately stabbed and drew back, all the while approaching the party, which watched them, petrified with terror.

It was evident that the monsters had no conception of the presence of humans. Blinded by the sun, only one thing could have induced them to leave the dark depths of Submundia. That was the mating instinct. The beetles were evidently rival leaders of some swarm, engaged in a duel to the death.

Round and round they went in a dizzy maze, stabbing and thrusting, jaws closing on flesh, until they dropped, close-locked in battle, not more than twenty feet from the little party of blacks and whites, both squirming in the agonies of death.

"I don't think that necessarily means that the swarm is on our trail,"

said Tommy, a little later, as the three stood beside the sh.e.l.ls that they had discarded. "Those two were strays, lost from the swarm and maddened by the mating instinct. Still, it might be as well to wear these things for a while, in case they do follow us."

"You're right," answered Dodd, as he placed one of the sh.e.l.ls around Haidia. "We've got to get this little lady to civilization, and we've got to protect our lives in order to give this great new knowledge to the world. If we are attacked, you must sacrifice your life for me, Tommy, so that I can carry back the news."

"Righto!" answered Tommy with alacrity. "You bet I will, Jim."

The glaring sun of mid-afternoon was shining down upon the desert, but Haidia was no longer in pain. It was evident that she was fast becoming accustomed to the sunlight, though she still kept her eyes screwed up tightly, and had to be helped along by Dodd and Jimmy. In high good humor the three reached the encampment, to find that the blacks were feasting on the dead beetles, while the two eldest members of the party had proudly donned the sh.e.l.ls.

It was near sunset before they finally started. Dodd and Tommy had managed to make it clear to them that they wished to reach civilization, but how near this was there was, of course, no means of determining.

They noted, however, that the party started in a southerly direction.

"I should say," said Dodd, "that we are in South Australia, probably three or four hundred miles from the coast. We've got a long journey before us, but these blackfellows will know how to procure food for us."

They certainly knew how to get water, for, just as it began to grow dark, when the three were already tormented by thirst, they stopped at what seemed a mere hollow among the stones and boulders that strewed the face of the desert, and scooped away the sand, leaving a hole which quickly filled with clear, cold water of excellent taste.

After which they made signs that they were to camp there for the night.

The moon was riding high in the sky. As it grew dark, Haidia opened her eyes, saw the luminary, and uttered an exclamation, this time not of fear, but of wonder.

"Moon," said Dodd. "That's all right, girl. She watches over the night, as the sun does over the day."

"Haidia likes the moon better than the sun," said the girl wistfully.

"But the moon not strong enough to keep away the beetles."

"If I was you, I'd forget about the beetles, Haidia," said Dodd. "They won't come out of that hole in the ground. You'll never see them again."

And, as he spoke, they heard a familiar rasping sound far in the distance.

"How the wind blows," said Tommy, desperately resolved not to believe his ears. "I think a storm's coming up."

But Haidia, with a scream of fear, was clinging to Dodd, and the blacks were on their feet, spears and boomerangs in their hands, looking northward.

Out of that north a little black cloud was gathering. A cloud that spread gradually, as a thunder-cloud, until it covered a good part of the sky. And still more of the sky, and still more. All the while that faint, distant rasping was audible, but it did not increase in volume.

It was as if the beetles had halted until the full number of the swarm had come up out of the crater.