battlements that rose like bulwarks. On the side nearest to the railroad, sloping causeways, paved with stone, ran down to the plain under many gates, as the gangway of a ship when it is let down, and through the gaps in the walls--time and the trees had torn their way to and fro--there was nothing to be seen except the horizon, which might have been the deep sea.
He thought of Fibby waiting in the scrub for his breakfast, and made haste to descend to the streets again. Remembering the essentials of his talk with Estes as to the position of the Cow's Mouth, he passed up a side lane, disturbing the squirrels and monkeys that had taken up their quarters in the cool dark of the rows of empty houses. The last house ended in a heap of ruins among a tangle of mimosa and tall grass, through which ran a narrow foot-track.
Tarvin marked the house as the first actual ruin he had seen. His complaint against all the others, the temples and the palaces, was that they were not ruined, but dead--empty, swept, and garnished, with the seven devils of loneliness in riotous possession. In time--in a few thousand years perhaps--the city would crumble away. He was distinctly glad that one house at least had set the example.
The path dropped beneath his feet on a shelf of solid rock that curved over like the edge of a waterfall. Tarvin took only one step, and fell, for the rock was worn into deep gutters, smoother than ice, by the naked feet of millions who had trodden that way for no man knew how many years. When he rose he heard a malignant chuckle, half suppressed, which ended in a choking cough, ceased, and broke out anew. Tarvin registered an oath to find that scoffer when he had found the necklace, and looked to his foothold more carefully. At this point it seemed that the Cow's Mouth must be some sort of disused quarry fringed to the lips with rank vegetation.
All sight of what lay below him was blocked by the thick foliage of trees that leaned forward, bowing their heads together as night-watchers huddle over a corpse. Once upon a time there had been rude steps leading down the almost sheer descent, but the naked feet had worn them to glassy knobs and lumps, and blown dust had made a thin soil in their chinks. Tarvin looked long and angrily, because the laugh came from the bottom of this track, and then, digging his heel into the mould, began to let himself down step by step, steadying himself by the tufts of grass. Before he had realised it, he was out of reach of the sun, and neck deep in tall grass. Still there was a sort of pathway under his feet, down the almost perpendicular side. He gripped the grass, and went on. The earth beneath his elbows grew moist, and the rock where it cropped out showed rotten with moisture and coated with moss. The air grew cold and damp. Another plunge downward revealed to him what the trees were guarding, as he drew breath on a narrow stone ledge. They sprang from the masonry round the sides of a square tank of water so stagnant that it had corrupted past corruption, and lay dull blue under the blackness of the trees. The drought of summer had shrunk it, and a bank of dried mud ran round its sides. The head of a sunken stone pillar, carved with monstrous and obscene gods, reared itself from the water like the head of a tortoise swimming to land. The birds moved in the sunlit branches of the trees far overhead. Little twigs and berries dropped into the water, and the noise of their fall echoed from side to side of the tank that received no sunlight.
The chuckle that had so annoyed Tarvin broke out again as he listened. This time it was behind him, and wheeling sharply, he saw that it came from a thin stream of water that spurted fitfully from the rudely carved head of a cow, and dripped along a stone spout into the heavy blue pool. Behind that spout the moss-grown rock rose sheer. This, then, was the Cow's Mouth.
The tank lay at the bottom of a shaft, and the one way down to it was that by which Tarvin had come--a path that led from the sunlight to the chill and mould of a vault.
'Well, this is kind of the King, anyhow,' he said, pacing the ledge cautiously, for it was almost as slippery as the pathway on the rocks. 'Now, what's the use of this?' he continued, returning. The ledge ran only round one side of the tank, and, unless he trusted to the mudbanks on the other three, there was no hope of continuing his exploration further. The Cow's Mouth chuckled again, as a fresh jet of water forced its way through the formless jaws.
'Oh, dry up!'he muttered impatiently, staring through the half light that veiled all.
He dropped a piece of rock on the mud under the lip of the ledge, then tested it with a cautious foot, found that it bore, and decided to walk round the tank. As there were more trees to the right of the ledge than to the left, he stepped off on the mud from the right, holding cautiously to the branches and the tufts of grass in case of any false step.
When the tank was first made its rock walls had been perfectly perpendicular, but time and weather and the war of the tree roots had broken and scarred the stone in a thousand places, giving a scant foothold here and there.
Tarvin crept along the right side of the tank, resolved, whatever might come, to go round it. The gloom deepened as he came directly under the largest fig-tree, throwing a thousand arms across the water, and buttressing the rock with snake-like roots as thick as a man's body. Here, sitting on a root, he rested and looked at the ledge. The sun, shooting down the path that he had trampled through the tall grass, threw one patch of light on the discoloured marble of the ledge and on the blunt muzzle of the cow's head but where Tarvin rested under the fig-tree there was darkness, and an intolerable scent of musk. The blue water was not inviting to watch; he turned his face inward to the rock and the trees, and looking up, caught the emerald-green of a parrot's wing moving among the upper branches. Never in his life had Tarvin so acutely desired the blessed sunshine. He was cold and damp, and conscious that a gentle breeze was blowing in his face from between the snaky tree roots.
It was the sense of space more than actual sight that told him that there was a passage before him shrouded by the roots on which he sat, and it was his racial instinct of curiosity rather than any love of adventure that led him to throw himself at the darkness, which parted before and closed behind him. He could feel that his feet were treading on cut stone overlaid with a thin layer of dried mud, and, extending his arms, found masonry on either side. Then he lighted a match, and, congratulated himself that his ignorance of cows' mouths had not led him to bring a lantern with him. The first match flickered in the draught and went out, and before the flame had died he heard a sound in front of him like the shivering backward draw of a wave on a pebbly beach. The noise was not inspiriting, but Tarvin pressed on for a few steps, looking back to see that the dull glimmer of the outer day was still behind him, and lighted another match, guarding it with his hands. At his next step he shuddered from head to foot. His heel had crashed through a skull on the ground.
The match showed him that he had quitted the passage, and was standing in a black space of unknown dimensions. He fancied that he saw the outline of a pillar, or rows of pillars, flickering drunkenly in the gloom, and was all too sure that the ground beneath him was strewn with bones. Then he became aware of pale emerald eyes watching him fixedly, and perceived that there was deep breathing in the place other than his own. He flung the match down, the eyes retreated, there was a wild rattle and crash in the darkness, a howl that might have been bestial or human, and Tarvin, panting between the tree roots, swung himself to the left, and fled back over the mud-banks to the ledge, where he stood, his back to the Cow's Mouth and his revolver in his hand.
In that moment of waiting for what might emerge from the hole in the side of the tank, Tarvin tasted all the agonies of pure physical terror. Then he noted with the tail of his eye that a length of mud-bank to his left--half the mud-bank, in fact--was moving slowly into the water. It floated slowly across the tank, a long welt of filth and slime. Nothing came out of the hole between the fig-tree roots, but the mud-bank grounded under the ledge almost at Tarvin's feet, and opened horny eyelids, heavy with green slime.
The Western man is familiar with many strange things, but the alligator does not come within the common range of his experiences. A second time Tarvin moved from point to point without being able to explain the steps he took to that end. He found himself sitting in the sunshine at the head of the slippery path that led downwards. His hands were full of the
