The pale lips formed themselves slowly to the strange and unaccustomed sounds.

"Cherrie," she repeated, and smiled in comprehension. "Cherrie."

This was the first of many lessons, and it was amazing to both men how rapidly they learned to get their thoughts across. In turn, they learned to read the messages that the slim hands and graceful, undulating body conveyed. Even words were linked one by one with their indicated objects and meanings.

One syllable the girl used only in a hushed and awe-stricken tone. It was "Oong" that she whispered, while her eyes filled with terror and dread. And they knew this for the name of the horror that waited in the black center of that unholy place where the pathway of light ascended. It was later that they learned to read hatred as well as sheer terror in the emotions that the word _Oong_ aroused.

The first lesson ended in a soft exclamation from the girl. She withdrew, to return in a moment with a beaker of hammered gold, filled with cold water. In her hands, too, were strange fruits and branches of fungus. She ate bits of them to show they were food. And Jerry, as he watched her, was aware that he was famished. But the two men ate sparingly at first of the strange food.

It was tasteless, they found, except for an elusive flavor, but the reception of the food in their gnawing stomachs was satisfactory.

Their strength was returning, and with it came hope of release. The moon-people, evidently, were not altogether villainous.

"Thank you," said Jerry in a normal tone, "that was--" White fingers trembled against his lips to enforce silence.

The girl listened intently, then stole softly out into the corridor from which she had come. She motioned the men to follow, and pointed there in the dim light to a far room.

There were others, they saw; a group of young women lying at ease on their pallets, or moving slowly about. The need for quiet was apparent, more so when the figure of a man appeared as they watched.

Quickly the girl, Marahna, stepped before them and motioned them back to their room.

She followed and glanced quickly about. In the farther wall was an opening, close to the floor, and low, but they managed to work their way through at her silent command. A pa.s.sage, much like the others, lay beyond. It widened and grew higher, until they could stand erect.

Back in the circle of light they saw, for a moment, the man, bowing low in respect before Marahna. He carried a basket of light that shone brightly in the room.

"Replenishing the supply of sulphide," whispered Winslow.

A current of air came cool and refreshing from a branching tunnel in the rock. There was no lack of ventilation, as they well knew, throughout all the tortuous pa.s.sages, but this came with a scent of outdoors that set both men a-tingle with hope. Jerry forgot even the dull ache in his arm as he breathed deep of this messenger from the outside.

But exploration must wait. They needed to rest, to learn and to plan.

They returned when Marahna called softly from the room.

Time had lost all its meaning. They could only guess at the hours that had pa.s.sed since the hour they left their ship, could only make unanswered surmises as to where was the sun or how much was left of the long lunar day. They must escape--they would escape--but their one stroke for freedom must not be made when darkness and paralyzing cold should force them back into the hands of the enemy tribes.

Marahna was with them much of the time, and always they struggled and strove with desperate concentration to grasp at the meanings of the thoughts she tried to convey. And they learned much.

Of the pa.s.sage they believed they had found out to the surface, she knew little. But she showed them, with doubt in her face, that there was almost hopeless struggle along that path to the freedom above.

Sadly she touched Jerry's injured arm, and she shook her head in dejection.

The arm had had a bad wrench, Jerry found. No fracture, but the muscles and ligaments had been painfully torn. But Jerry set his teeth firm at the thought of a possible escape.

Once, peering along the dark pa.s.sage that led to the room where the others had been seen, the men noticed the deep bows that unfailingly marked the entrance of Marahna. They questioned her and learned that here was royalty among the people of the moon. This, as they considered the proud poise of her head and her whole att.i.tude of una.s.suming superiority was not entirely surprising. But they marveled the more at the truth that she finally made plain to them.

Marahna, she told them, as plainly as if she were speaking in their own tongue, Marahna was chosen for death. And her white face was pitiful and her eyes full of horror as she enacted for them the slow march she must take up the long golden slope and into the horror that waited.

"A sacrifice to that G.o.d!" Jerry spoke with dismay. "No, no!" But the face of the Princess Marahna of the moon people was unutterably sad with unspoken thoughts as she touched her breast with one slender finger, then indicated the outer room and showed there were two there beside herself who were to go.

"Help us to get out," Jerry begged, and with fierce eagerness he showed them going through the pa.s.sage to the outside. "We will come back, and we will find some way to end all this d.a.m.nable thing."

She gave them to understand the time that was left. The sun, she showed, was long past the meridian and was on its return. The day was now reaching a close. And then, as the sun set, the great sacrifice would be made--had always been made--to insure the return of their G.o.d.

Their watches were useless, for the water had entered their cases. The two men waited what they judged was the length of a day, while Jerry tried to believe that his arm was improving. Then, putting a small supply of food in their pockets, they were ready for the attempt.

Jerry saw that his gun and knife were ready at his belt, and patted a pocket where his matches were safe in their watertight container. The prospect of escape almost unnerved him. To breathe the clear air; to stand in the radiant light of the sun--he could understand now how these people made a G.o.d of the sun. He turned to Marahna.

"Good-by," he said, "but not for long. We'll be back. And we'll save you, Marahna, we'll save you. Winslow will figure some way to do it.... We'll be back...."

The girl was silent. She touched Jerry's arm, and shook her head slowly, doubtfully.

He reached for the hand. It trembled, he felt, in his. The impulse to take the slim form within his arms, to hold her close, was strong upon him. Would he ever see her again ... would he?

"Won't you say good-by, Marahna?" he asked.

But she smiled, instead--a friendly smile, and encouraging. Then dropped in silence to her knees to press with both her trembling hands his hand upon her forehead. And, still in silence, she rose to vanish from the room.

The men entered the narrow opening to start forward into the dark. But Jerry Foster was puzzled, puzzled and more than a trifle hurt. Marahna could at least have said good-by. She knew the word, for he had taught it to her. And she had let him--them--go....

"Oh, well," he thought, "how can I know how a princess feels--a princess of the moon? And why should I care--why should she? But...."

He refused to complete the thought. He hurried instead, as best he could, to follow Winslow, fumbling ahead of him in the dark.

Jerry had used plenty of muttered invective with the ma.s.sage he had given his arm, but he cursed his handicap wholeheartedly at the end of some several hours.

They were standing, he and Winslow, in a dark tunnel. They had climbed and clawed their way through the absolute dark, over broken fragments, through narrow apertures, down and up, and up again through a tortuous, winding course. And now they had reached the end. They had found the source of the fresh air, had come within reaching distance, it seemed, of sunlight and all that their freedom might mean. And they had come, too, to a precipitous rock wall.

They stared long and hopelessly at the shaft that reached, vertical and sheer, high, high over their heads. And a curse like that of Tantalus was theirs. For, far at the top, slanting in through some off-shooting pa.s.sage, there was sunlight. It was unmistakable in its clear glare, beautiful, glorious--and unattainable.

There were roughnesses in the wall, footholds, handholds here and there. "It might be ... it might be...." Jerry tried to believe, but the ache in his arm made the thought hopeless and incomplete. He turned to his companion.

"I believe you can do it," he said steadily.

Winslow's dark eyes were gleaming in the dimness that surrounded.

"Possibly," he replied, and eyed the ascent with an appraising stare.

"Even probably. But you know d.a.m.n well, Foster, that I'm not going to try."

"Don't be an a.s.s." Jerry's tone was harsh, but the tall man must have known what emotions lay underneath.

"We'll play it out together," he said.