hours.

“I tried to hang onto my Silver Belt, of course,” the girl continued, “but when I was brought to the cavern here I saw that the king was going to take it. There was a notebook and a pencil in my laboratory smock. I managed to write the note and twine it into the belt just before it was taken from me. The king seemed to think the note enhanced the Belt’s value as an ornament. He was wearing it when I last saw it. Was he materialized in the laboratory with the Belt?”

Powell told her of the amber egg and the skeleton.

“The same sort of crystalline amber egg that accompanied the work of the mysterious Tinkling Death, wasn’t it?” Joan mused. “One of the king’s lieutenants must have stolen the Belt, and reaped prompt retribution when he tried to flee. I wonder what that weird Tinkling Death is?”

“Possibly some strange weapon of the rat-men,” Powell hazarded.

“No, they are as afraid of it as we are. While I was being brought here to this cave the Tinkling Death was heard several times in the distance, and the rat-men were obviously terrified at the sound.”

The prisoners’ conversation was abruptly interrupted by a rhythmic, snarling chant from the vast horde of rat-men in the cavern above. The chant rose and fell in a rude cadence that was suggestively ritual in nature.

“They’ve been doing that at intervals ever since I was first brought here,” Joan commented. “It sounds almost like the beginning of some primitive religious ceremony, doesn’t it?”

Powell nodded, without telling Joan the depressing thought in his mind. The rat-men were so low in the evolutionary scale as to be little more than beasts, and a prominent feature of nearly all primitive religious rites is the sacrifice of living beings. Powell could not help but wonder whether the chanting might not mark the beginning of rites which would end with the sacrifice of himself and Joan to some monstrous deity of theirs.

The snarling chant continued with monotonous regularity for hours, while the prisoners huddled helplessly together there on the floor of the pit, awaiting the next move of the rat-men. Any thought of escape was out of the question. The sheer walls of the pit were always guarded by alert sentries who had only to call to bring the entire horde to their help.

Without Powell’s wrist-watch, the captives had no way of accurately following the lapse of time, but they both realized that the twelve-hour time limit upon Joan’s rescue from Arret must be coming perilously near its end. They waited in momentary fear lest a sudden turmoil in the cavern above them should indicate that Benjamin Marlowe had broadcast the recall wave, whisking the two Belts back to Earth, together with the old rat-king who presumably still wore them.

The chanting above rose slowly to a snarling climax, then swiftly died away into silence. A moment later there came the sound of thousands of claw-like feet scratching over the rocky floor as the main horde apparently began marching out of the cavern. A detachment of fifty rat-men appeared at the pit’s edge.

A rude metal ladder was shoved down to the captives, and a metal-collared leader motioned for them to climb up. Seeing nothing to be gained by refusal, they obeyed. They were seized as they reached the top, and their hands again bound behind them. The overwhelming numbers of the rat-men made any attempt at resistance futile.

There was no sign of the main horde as Joan and Powell were herded out through the empty cavern and out into the open air again. With their prisoners in the center of their group, the rat-men started along a well-worn path that wound through the red vegetation. Overhead the blood-red moon still blazed down in lurid splendor.

From somewhere ahead of them the captives began to again hear the distant squealing chant of the main horde. They steadily approached the sound, until abruptly they emerged into a huge clearing that had apparently been a ceremonial assembly place for generations, for its smooth sandy floor was packed down nearly to the hardness of rock.

The main horde of rat-men was there now, countless thousands of them, packed in a roughly crescent-shaped mob, with the open side of their formation facing what seemed to be a large deep pit, some seventy yards in circumference. In the clear space left between the horde and the edge of the pit was a smaller group, among them the old king himself.

Powell’s heart leaped as he noted that the Silver Belts were still draped over the mangy old monarch’s shoulders. If only he and Joan could get their hands on those precious Belts before Benjamin Marlowe broadcast the recall wave that would forever snatch them out of their reach!

The captives were hurried through the main horde and taken in charge by a score of picked guards who herded them on to join a small group of four rat-men near the pit’s edge. These four rodents were apparently also prisoners, for their arms were firmly bound behind them.

The rat-king, accompanied only by the metal-collared leader, around whose shoulders the gun-belt was still draped, stood near the pit’s edge some ten yards distant from the guards and captives. Between the prisoners and the rodent monarch the edge of the pit jutted out in a narrow tongue of rock that extended outward for about twenty feet over the pit.

Joan and Powell had barely taken their place with the other captives when an abrupt and familiar sound drew their attention to the floor of the pit some thirty feet beneath them. Its smooth sandy bottom was clearly visible from where they stood. And there on that sandy floor were six great gleaming shapes of menace which brought involuntary gasps of horrified amazement to the captives’ lips.

The faint musical tinkling sound as the things moved in occasional ponderous restlessness was unmistakable. Joan and Powell realized that the amazing organisms responsible for the mysterious Tinkling Death were at last before them.

The things were giant living crystals—great silvery semi-transparent shapes nearly ten feet in height, their faceted sides pulsing in sinister and incredible life as they gleamed in unearthly beauty beneath the blazing rays of the red moon!

Near the center of each of the giant crystals there was visible through the semi-transparent wall a large inner nucleus of sullen opalescence that ceaselessly swirled and eddied.

Their powers of movement were apparently limited to a slow, ponderous, half-rocking, half-rolling progress on their heavy rounded bases. They were now grouped in a rough semicircle just under the edge of the rocky projection that extended out over the pit. The opalescent nucleus in every silvery faceted form seemed to be “watching” with frightening intensity the figures on the pit’s edge above them.

There was no mistaking the meaning of the scene. The giant carnivorous crystals had obviously been lured from their normal habitat in Arret’s red vegetation, and established there in the big pit by the rat-men to act as principals in their primitive religious ceremonies.

Those Devil Crystals waiting down there on the pit’s floor were waiting to be fed—and the small group of captives, rat-men and human beings, were to be the feast!

Utterly sick at heart, Powell wondered if they would at least be given the boon of a merciful death before being hurled over the brink to those lurking shapes. He was not left long in doubt.

At a shrill command from the rat-king the guards closed in upon the captives and herded two of