land at Cape Surville； for the whole station would be on the alert； so Blunt； as night was falling； stood off a little across the mouth of Pirates' Bay。 He was walking the deck； groaning at the folly of the expedition； when a strange appearance on the southern horn of the bay made him come to a sudden halt。 There was a furnace blazing in the bowels of the mountain！ Blunt rubbed his eyes and stared。 He looked at the man at the helm。 〃Do you see anything yonder； Jem？〃
Jema Sydney man； who had never been round that coast before briefly remarked； 〃Lighthouse。〃
Blunt stumped into the cabin and got out his charts。 No lighthouse was laid down there； only a mark like an anchor； and a note； 〃Remarkable Hole at this Point。〃 A remarkable hole indeed； a remarkable 〃lime kiln〃 would have been more to the purpose！
Blunt called up his mate； William Staples； a fellow whom Sarah Purfoy's gold had bought body and soul。 William Staples looked at the waxing and waning glow for a while； and then said； in tones trembling with greed； 〃It's a fire。 Lie to； and lower away the jolly…boat。 Old man； that's our bird for a thousand pounds！〃
The Pretty Mary shortened sail； and Blunt and Staples got into the jolly…boat。
〃Goin' a…hoysterin'； sir？〃 said one of the crew； with a grin； as Blunt threw a bundle into the stern…sheets。
Staples thrust his tongue into his cheek。 The object of the voyage was now pretty well understood among the carefully picked crew。 Blunt had not chosen men who were likely to betray him； though； for that matter； Rex had suggested a precaution which rendered betrayal almost impossible。
〃What's in the bundle； old man？〃 asked Will Staples； after they had got clear of the ship。
〃Clothes；〃 returned Blunt。 〃We can't bring him off； if it is him； in his canaries。 He puts on these duds； d'ye see； sinks Her Majesty's livery； and comes aboard； a 'shipwrecked mariner'。〃
〃That's well thought of。 Whose notion's that？ The Madam's； I'll be bound。〃
〃Ay。〃
〃She's a knowing one。〃
And the sinister laughter of the pair floated across the violet water。
〃Go easy； man；〃 said Blunt； as they neared the shore。 〃They're all awake at Eaglehawk； and if those cursed dogs give tongue there'll be a boat out in a twinkling。 It's lucky the wind's off shore。〃
Staples lay on his oar and listened。 The night was moonless； and the ship had already disappeared from view。 They were approaching the promontory from the south…east； and this isthmus of the guarded Neck was hidden by the outlying cliff。 In the south…western angle of this cliff； about midway between the summit and the sea； was an arch； which vomited a red and flickering light； that faintly shone upon the sea in the track of the boat。 The light was lambent and uncertain； now sinking almost into insignificance； and now leaping up with a fierceness that caused a deep glow to throb in the very heart of the mountain。 Sometimes a black figure would pass across this gigantic furnace…mouth； stooping and rising； as though feeding the fire。 One might have imagined that a door in Vulcan's Smithy had been left inadvertently open； and that the old hero was forging arms for a demigod。
Blunt turned pale。 〃It's no mortal；〃 he whispered。 〃Let's go back。〃
〃And what will Madam say？〃 returned dare…devil Will Staples who would have plunged into Mount Erebus had he been paid for it。 Thus appealed to in the name of his ruling passion； Blunt turned his head； and the boat sped onward。
CHAPTER XXVI。
THE WORK OF THE SEA。
The lift of the water…spout had saved John Rex's life。 At the moment when it struck him he was on his hands and knees at the entrance of the cavern。 The wave； gushing upwards； at the same time expanded； laterally； and this lateral force drove the convict into the mouth of the subterranean passage。 The passage trended downwards； and for some seconds he was rolled over and over； the rush of water wedging him at length into a crevice between two enormous stones； which overhung a still more formidable abyss。 Fortunately for the preservation of his hard…fought…for life； this very fury of incoming water prevented him from being washed out again with the recoil of the wave。 He could hear the water dashing with frightful echoes far down into the depths beyond him； but it was evident that the two stones against which he had been thrust acted as breakwaters to the torrent poured in from the outside； and repelled the main body of the stream in the fashion he had observed from his position on the ledge。 In a few seconds the cavern was empty。
Painfully extricating himself； and feeling as yet doubtful of his safety； John Rex essayed to climb the twin…blocks that barred the unknown depths below him。 The first movement he made caused him to shriek aloud。 His left armwith which he clung to the ropehung powerless。 Ground against the ragged entrance； it was momentarily paralysed。 For an instant the unfortunate wretch sank despairingly on the wet and rugged floor of the cave； then a terrible gurgling beneath his feet warned him of the approaching torrent； and； collecting all his energies； he scrambled up the incline。 Though nigh fainting with pain and exhaustion； he pressed desperately higher and higher。 He heard the hideous shriek of the whirlpool which was beneath him grow louder and louder。 He saw the darkness grow darker as the rising water…spout covered the mouth of the cave。 He felt the salt spray sting his face； and the wrathful tide lick the hand that hung over the shelf on which he fell。 But that was all。 He was out of danger at last！ And as the thought blessed his senses； his eyes closed； and the wonderful courage and strength which had sustained the villain so long exhaled in stupor。
When he awoke the cavern was filled with the soft light of dawn。 Raising his eyes； he beheld； high above his head； a roof of rock； on which the reflection of the sunbeams； playing upwards through a pool of water； cast flickering colours。 On his right hand was the mouth of the cave； on his left a terrific abyss； at the bottom of which he could hear the sea faintly lapping and washing。 He raised himself and stretched his stiffened limbs。 Despite his injured shoulder； it was imperative that he should bestir himself。 He knew not if his escape had been noticed； or if the cavern had another inlet； by which McNab； returning； might penetrate。 Moreover； he was wet and famished。 To preserve the life which he had torn from the sea； he must have fire and food。 First he examined the crevice by which he had entered。 It was shaped like an irregular triangle； hollowed at the base by the action of the water which in such storms as that of the preceding night was forced into it by the rising of the sea。 John Rex dared not crawl too near the edge； lest he should slide out of the damp and slippery orifice； and be dashed upon the rocks at the bottom of the Blow…hole。 Craning his neck； he could see； a hundred feet below him； the sullenly frothing water； gurgling； spouting； and creaming； in huge turbid eddies； occasionally leaping upwards as though it longed for another storm to send it raging up to the man who had escaped its fury。 It was impossible to get down that way。 He turned back into the cavern； and began to explore in that direction。 The twin…rocks against which he had been hurled were； in fact； pillars which supported the roof of the water…drive。 Beyond them lay a great grey shadow which was emptiness； faintly illumined by the sea…light cast up through the bottom of the gulf。 Midway across the grey shadow fell a strange beam of dusky brilliance； which cast its flickering light upon a wilderness of waving sea…weeds。 Even in the desperate position in which he found himself； there survived in the vagabond's nature sufficient poetry to make him value the natural marvel upon which he had so strangely stumbled。 The immense promontory； which； viewed from the outside； seemed as solid as a mountain； was in reality but a hollow cone； reft and split into a thousand fissures by the unsuspected action of the sea for centuries。 The Blow…hole was but an insignificant cranny compared with this enormous chasm。 Descending with difficulty the steep incline； he found himself on the brink of a gallery of rock； which； jutting out over the pool； bore on its moist and weed…bearded edges signs of frequent submersion。 It must be low tide without the rock。 Clinging to the rough and root…like algae that fringed the ever…moist walls； John Rex crept round the projection of the gallery； and passed at once from dimness to daylight。 There was a broad loop…hole in the side of the honey…combed and wave…perforated cliff。 The cloudless heaven expanded above him； a fresh breeze kissed his cheek and； sixty feet below him； the sea wrinkled all its lazy length； sparkling in myriad wavelets beneath the bright beams of morning。 Not a sign of the recent tempest marred the exquisite harmony of the picture。 Not a sign of human life gave evidence of the grim neighbourhood of the prison。 From the recess out of which he peered nothing was visible but a sky of turquoise smiling upon a sea of sapphire。
The placidity of Nature was； however； to the hunted convict a new source of alarm。 It was a reason why the Blow…hole and its neighbourhood should be thoroughly searched。 He guessed that the favourable weather would be an additional inducement to McNab and Burgess to satisfy themselves as to the fate of their late prisoner。 He turned from the opening； and prepared to descend still farther intO the rock pathway。 The sunshine had revived and cheered him； and a sort of instinct told him that the cliff； so honey…combed above； could not be without some gully or chink at its base； which at low tide would give upon the rocky shore。 It grew darker as he descended； and twice he almost turned back in dread of the gulfs on either side of him。 It seemed to him； also； that the gullet of weed…clad rock through which he was crawling doubled upon itself； and led only into the bowels of the mountain。 Gnawed by hunger； and conscious that in a few hours at most the rising tide would fill the subterranean passage and cut off his retreat； he pushed desperately onwards。 He had descended some ninety feet； and had lost； in the deviou