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I cannot say what we expected； for we knew not what to expect。
Many conjectures entered my mind； but none of them approached the fact。 But； thinking that our guide might now return at any moment to lead us below； and not caring to be surprised by an attack from behind on that narrow precipice； I moved across to the rear； where I could keep my eyes on the alcove opposite； and at the same time watch the stone slab which closed the opening to the spiral stairway。 A word to Harry and he joined me。
〃Perhaps we can open it from above；〃 he suggested。
〃Not likely；〃 I answered； 〃and； anyway； what's the use？〃
He knelt down and tugged at it； but there was no edge on which to obtain a purchase。 The thing was immovable。
Five minutes passed； during which there was no movement； either in the audience on the stone seats or in the alcove。 But there was an indefinable air of expectancy on the faces of the king and those surrounding him； and I kept a sharp eye on the stone slab。
Another five minutes and still nothing happened。 Harry called across to Desiree； or rather began to call； for I stopped him with a jerk。 It was impossible for her to aid us； and her situation was already sufficiently perilous。
Then； being impatient； I decided to try to move the stone slab myself。 Kneeling down； I placed the palms of my hands firmly against its surface and pressed with all my weight。
And then I knew。 plete prehension flashed through my brain on the instant。 I sprang to my feet； and my thought must have shown on my face； for Harry looked at me in surprise； demanding：
〃What is it？ What is it； Paul？〃
And I answered calmly：
〃We're caught； Hal。 Like rats in a trap。 Oh； the black devils！ Listen！ We have no time to lose。 Bend over and touch the palm of your hand to the ground。〃
He did so； plainly puzzled。 Then he drew his hand hastily away； exclaiming： 〃It's hot！〃
〃Yes。〃 I spoke quickly。 〃Our boots kept us from feeling it before； and the stone doesn't throw out enough heat to feel it in the air。 They've built a fire under us in the column。 The stone is thick and heats slowly。〃
〃But what…that means…〃
〃It means one of two things。 In a few minutes this floor will be baking hot。 Then we either fry on their stone griddle or drown in the lake。 You see the distance below…only a man crazed by suffering or one incredibly brave would take that leap。 This is their little entertainment…they expect us to dance for them。〃
〃But the lake！ If we could take it clean…〃
I saw that the lake was our only chance； if there could be said to be any in so desperate a situation。 To be sure； there seemed to be no possibility of escaping； even if we took the water without injury。 On every side its bank was lined with the watching Incas； and the bank itself was so steep that to ascend it would have required wings。
The heat began to be felt even through the soles of our heavy boots； involuntarily I lifted one foot； then the other。 I saw the Child of the Sun in the alcove lean forward with an appreciative grin。 Another minute… I jerked my wits together…never did my brain answer with better speed。 And then I remembered that flash of water I had seen under the spiral stairway at the base of the column。 I had thought at the time that it might be connected with the lake itself。 If that were so… I turned to Harry and conveyed my idea to him in as few words as possible as we walked up and down； side by side。 It was impossible longer to stand still…the stone was so hot that the bare hand could not be held against it for an instant。 I saw that he did not prehend what I said about the water in the column； but he did understand my instructions； and that was all that was necessary。
We ran to the edge of the column nearest the alcove。
Removing our woolen knickerbockers…for better ease in the water…we placed them on the hot stone； and on top of them our boots； which we had also removed。 Thus our feet were protected as we stood on the extreme edge of the column； taking a deep breath for strength and nerve。
I saw the thousands of black savages…who had been cheated of their dance…crane their necks forward eagerly。
I saw the king gesture excitedly to an attendant； who turned and flew from the alcove。
I saw Desiree spring up from the golden throne and run to the edge of the alcove； crying to us in a tone of despair。 But I did not hear her words； for I myself was calling：
〃Take it clean； Hal。 Ready…go！〃
The next instant we were flying headlong through the air toward the surface of the lake a hundred feet below。
Men have told me since that I never made that dive； or that I greatly overestimated the distance； and I admit that as I look back at it now it appears incredible。 Well； they are wele to their opinion； but I would not advise them to try to argue the matter with Harry。
The impact with the water all but pletely stunned me； as I struck the surface it seemed that a thousand cannons had exploded in my ears。 Down； down I went…lucky for us that the lake was apparently bottomless！
I seemed to have gone as far below the water as I had been above it before I was able to twist myself about and meet it with my belly。 Then； striking out with every ounce of strength in me； I made for the surface as rapidly as possible。 I had started with my lungs full of air； but that headlong plunge had emptied them。
I made the surface at last and looked round for Harry； calling his name。 For perhaps thirty seconds I called in vain； then there came an unanswering shout off to the left。 The urns were far above us now； and the light on the surface of the lake was very dim； but soon I made out Harry's head。 He was swimming easily toward me； apparently unhurt。
〃All right； Hal？〃
〃Right。 And you？〃
〃Sound as a whistle。 Now make for the column。〃
At the instant that we turned to swim toward the column I became aware of a strong current in the water carrying us off to the right。 It was inexplicable； but there was no time then for speculation； and we struck out with bold； sweeping strokes。
The Incas had left the stone seats and advanced to the water's edge。 I could see their black； sinister faces； thousands of them； peering intently at us through the dim light； but they made no sound。
Once I cast a glance over my shoulder and saw Desiree standing at the edge of the alcove with her clenched fists pressed to her throat。 Beside her stood the Child of the Sun。 Harry； too； saw her and sent her a shout of farewell； but there was no answer。
We were now less than thirty feet from the column。 Its jeweled sides sparkled and shone before us； looking up； our eyes were dazzled。 Something struck the water near me。 I glanced to the right and saw what moved me to hasten my stroke and call to Harry to do likewise。
The black devils were increasing the fun by hurling stones at us from the bank…apparently with the kind approval of Pachacamac。
As we neared the column the current which tended to carry us to the right became stronger； but still we seemed not to be approaching the bank。 What could it mean？ The struggle against it was fast taking our strength。
Looking up； I saw that we had swung round to the other side of the column…it was between us and the