duct sapping operations against us like engineers, or what?"
Dodd did not reply, and Tommy hardly expected any answer. As the two men, now joined by Haidia, witched, they saw that the beetles were actually digging themselves into the sand.
Within the space of an hour, by the time the first, shafts of sunlight began to stream into the room, there was to be seen only the missive, rounded shells of the monsters as they squatted in the sand.
"Now you may fetch water," said Haidia, smiling at her lover. "No, you do not need the shells," she added. "The beetles are finish. It is as the wise men of my people told me."
Wondering, hesitating. Tommy and Dodd unlocked. the front door. They stood upon the threshold ready to bolt back again. But there was no stirring among the beetle hosts.
Growing bolder, they advanced a few steps; then, shamed by Haidia's courage, they followed her, still cautiously to the station.
Dodd shouted as he saw a water-tank, and a receptacle above it with a water-cock., They let Haidia drink, then followed suit, and for a few moments, as they appeased their thirst, the beetles were forgotten.
Then they turned back. There had been no movement in that line of shells that glinted in the morning sunlight.
"Come, I shall show you," said Haidia confidently, advancing toward tie trench.
Dodd would have stopped her, but the girl moved forward quickly, eluded him with a graceful, mirthful gesture, tad stooped down over the trench.
She rose up, raising in her arms an empty beetle-shell!
Dodd, who had reached the trench before Tommy, turned round and Filled to him excitedly. Tommy ran forward—and then he understood.
The shells were empty. The swarm, whose life cycle Bram had admitted he did not understand, had just moulted!
It had moulted because the bodies, gorged with food, bad grown too large for the shells. In time, if left alone, the monsters would grow larger shells, become invincible again. But just now they were defenseless as new-born babes—and knew it.
Deep underneath, the empty shells they had burrowed into the ground. Everywhere at the bottom of the deep trenches were the naked, bestial creatures, waving helpless tentacles and squirming over one another as they strove to find shelter and security.
A sudden madness came over Tommy and Dodd. "Dynamite—there must be dynamite!" Dodd shouted, as he ran back to the station.
"Something better than dynamite," shouted Tommy, holding up one of a score of drums of petrol!
CHAPTER XI
The World Set Free
They waited two days at Settler's Station. To push along the line into the desert would have been useless, and both men were convinced that, an airplane would arrive for them. But it was not until the second afternoon that the aviator arrived, half-dead with thirst and fatigue, and almost incoherent.
His was the last plane on the Australian continent. He brought the news of the destruction of Adelaide, and of the siege of Melbourne and Sydney, as he termed it. He told Dodd and Tommy that the two cities had been surrounded with trenches and barbed wire. Machine guns and artillery were bombarding the trenches in which the beetles had taken shelter.
"Has any one been out on reconnaissance?" asked Tommy.
Nobody had been permitted to pass through the barbed wire, though there had been volunteers. It meant certain death. But, unless the beetles were sapping deep in the ground, what their purpose was, nobody knew.
