He panted heavily, and a faintness came upon him at times, in which the lights seemed to blur. A great weariness clogged his limbs and his brain. How long it was since he had eaten, he could not know. He was not aware of hunger or thirst; but he seemed to fight an ever-growing weakness. The corridor became a black eternity, haunted by the green eyes of cosmic demons.

Hour after hour he went on, through a cycle of sunless night. He lost the sense of time, and his movements became a sort of automation. His limbs were numb and dead, and it was only his relentless will that lived and drove him on. Almost, at times, he forgot where he was going—forgot everything but the blind, primitive impulse of flight. He was a nameless thing, fleeing from anonymous terror.

At last, through the crushing numbness of his fatigue, there dawned the realization that he was gaining a little on the group of lights ahead. Possibly their bearers had paused in doubt or debate. Then, suddenly, he saw that the lights were spreading out, were diverging and vanishing on either hand, till only four of them remained.

Dimly puzzled, he went on, and came to that triple division of the tunnel which he remembered passing with Agvur. He saw now that the party of Oumnis had divided into three contingents, following all the branches. Doubtless each tunnel led to a separate exit.

Recalling what Agvur had said, he kept to the middle passage. This, if Agvur had spoken truly, would lead to an exit in the twilight zone, not far from the rocket-ship. The other tunnels would lead he knew not where—perhaps to the terrible deserts of heat and the piled, chaotic glaciers of the nightward hemisphere. The one he was following, with luck, would enable him to rejoin his comrades.

A sort of second wind came to Howard now—as if hope had revived his swooning faculties. More clearly than before, he became conscious of the utter silence and profound mystery of this underworld empire, of which he had seen—was to see—so little. His hope quickened when he looked back and saw that the lights behind him had diminished in number, as if the second party had likewise separated to follow all three of the tunnels. It was obvious that there was no general pursuit. In all likelihood the smashing of the transmission levers had deranged all the machineries of the Immortals, even to their system of communication. Howard’s escape, doubtless, was known only to those who had been present or near at the time. He had brought chaos and demoralization upon this super-scientific people.

V

Mile after mile of that monotone of gloom. Then, with a start of bewilderment, the earth-man realized that the four lights in front had all disappeared. Looking back, he saw that the lamps which followed him had similarly vanished. About, before and behind there was nothing but a solid, tomb-like wall of darkness.

Howard felt a strange disconcertment, together with the leaden, crushing return of his weariness. He went on with doubtful, slackening steps, following the right hand wall with cautious fingers. After awhile he turned a sharp corner; but he did not recover the lost lights. There was a drafty darkness in the air, and odors of stone and mineral, such as he had not met heretofore in the mouffa-lined caverns. He began to wonder if he had somehow gone astray: there might have been other branchings of the tunnel, which he had missed in his groping. In a blind surge of alarm, he started to run, and crashed headlong against the angular wall of another turn in the passage.

Half-stunned, he picked himself up. He hardly knew, henceforth, whether he was maintaining the original course of his flight or was doubling on his own steps. For aught that he could tell, he might be lost beyond all redirection in a cross-labyrinth of caverns. He stumbled and staggered along, colliding many times with the tunnel-sides, which seemed to have closed in upon him and to have grown rough with flinty projections.

The draft in his face grew stronger, with a smell of water. Presently the blindfold darkness before him melted into a chill, bluish glimmering, which revealed the rugate walls and boulder-flanged roof of the natural passage he was following.

He came out in a huge, chamber-like cave of some marble-pallid stone with twisted columnar forms. The glimmering, he saw, was a kind of phosphorescence emitted by certain vegetable growths, probably of a thallophytic nature, which rose in thick clusters from the floor, attaining the height of a tall man. They were flabby and fulsome-looking, with abortive branches, and pendulous fruit-shaped nodes of etiolated purple along their puffy, whitish-blue stems. The phosphorescence, which issued equally from all portions of these plants, served to light the gloom for some distance around, and brought out dimly the columnated character of the cavern’s further walls.

Howard saw, as he passed among them, that the plants were rootless. It seemed that they would topple at a touch; but happening to stumble against one of the clumps, he found that they supported his weight with resilient solidity. No doubt they were attached firmly by some sort of suction to the smooth stone.

In the middle of the cave, behind a lofty fringing of these luminous fungi, he discovered a pool of water, fed by a thin trickle that descended through the gloom from a high vault that the phosphorescence could not illumine. Impelled by a sudden, furious thirst, he slid back the mouffa-hood and drank recklessly, though the fluid was sharp and bitter with strange minerals. Then, with the ravening hunger of one who has not eaten for days, he began to eye the pear-shaped nodes of the tall thallophytes. He broke one of them from its parent stem, tore off the glimmering rind, and found that it was filled with a meaty pulp. A savorous, peppery odor tempted him to taste the pulp. It was not unpleasant, and forgetting all caution (possibly he had become a little mad from his extra-human ordeals) he devoured the stuff in hasty mouthfuls.

The node must have contained a narcotic principle; for almost immediately he was overpowered by an insuperable drowsiness. He fell back and lay where he had fallen, in a deep sodden sopor without dreams, for a length of time which, as far as he could know, might have been the interim of death between two lives. He awoke with violent nausea, a racking headache, and a feeling of hopeless, irredeemable confusion.

He drank again from the bitter pool, and then began to hunt with cloudy senses and feeble, uncertain steps for another exit than the tunnel by which he had entered. His mind was dull and heavily drugged, as if from the lingering of the unknown narcotic, and he could formulate no conscious plan of action but was led only by an animal-like impulse of flight.

He discovered a second opening, low, and fanged with broken-off pillar formations, in the opposite wall of the cavern. It was filled with Stygian darkness; and before entering it, he tore a lumpy branch from one of the phosphorescent fungi, to serve him in lieu of other light.

His subsequent wanderings were nightmarish and interminable. He seemed to have gotten into some tremendous maze of natural caverns, varying greatly in size, and intersecting each other in a bewildering honeycomb fashion: an underworld that lay beyond the metal-insulated realm of the Oumnis.

There were long, tediously winding tunnels that went down into Cimmerian depth, or climbed at acclivitous angles. There were strait cubby-holes, dripping with unknown liquid ores, through which he crawled like a lizard on his belly; and Dantean gulfs that he skirted on slippery, perilous, broken ledges, hearing far below him the sullen sigh or the weirdly booming roar of sub-Mercutian waters.

For awhile, his way led mainly downward, as if he were plunging to the bowels of the planet. The air became warmer and more humid. He came at last to the sheer brink of an incommensurable abyss, where noctilucent fungi, vaster than any he had yet seen, grew tall as giant trees along the precipice that he followed for miles.