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Some of these questions I answered for myself； others remained unsolved for many months； until I had opportunity to avail myself of knowledge more profound than my own。 Easy enough to guess that the hidden deposits of the mountain had yielded oil which needed only a spark from a piece of flint to fire it； and any one who knows anything of the geological formation of the Andes will not wonder at their supply of air。
Nature is not yet ready for man in those wild regions。 Huge upheavals and convulsions are of continual occurrence； underground streams are known which rise in the eastern Cordillera and emerge on the side of the Pacific slope。 And air circulates through these passages as well as water。
Their silence remains inexplicable； but it was probably the result of the nature of their surroundings。 I have spoken before of the innumerable echoes and reverberations that followed every sound of the voice above a whisper。 At times it was literally deafening； and time may have made it so in reality。
The natural effect through many generations of this inconvenience or danger would be the stoppage of speech； leading possibly to a plete loss of the faculty。 I am satisfied that they were incapable of vocalization； for even the women did not talk！ But that is ahead of the story。
I occupied myself with these reflections； and found amusement in them； but it was impossible to lead Harry into a discussion。
His mind was anything but scientific； anyway； and he was pletely obsessed by fear for the safety of Desiree。 And I wasn't sorry for it； it is better that a man should worry about some one else than about himself。
Our chance of rescuing her； or even of saving ourselves； appeared to me woefully slim。 One fear at least was gone； for the descendants of Incas could scarcely be cannibals； but there are other fates equally final； if less distasteful。 The fact that they had not even taken the trouble to bind us was an indication of the strictness of their watch。
The hours crept by。 At regular intervals our food was replenished and we kept the platter empty； storing what we could not eat in our ponchos against a possible need。
It was always the same…dried fish of the consistency of leather and a most aggressive taste。 I tried to convey to one of our captors the idea that a change of diet would be agreeable； but either he did not understand me or didn't want to。
Gradually our strength returned； and with it hope。 Harry began to be impatient； urging action。 I was waiting for two things besides the return of strength； first； to lay in a supply of food that would be sufficient for many days in case we escaped； and second； to allow our eyes to accustom themselves better to the darkness。
Already we were able to see with a fair amount of clearness； we could easily distinguish the forms of those who came to bring us food and water when they were fifteen or twenty feet away。 But the cavern in which we were confined must have been a large one； for we were unable to see a wall in any direction； and we did not venture to explore for fear our captors would be moved to bind us。
But Harry became so insistent that I finally consented to a scouting expedition。 Caution seemed useless； if the darkness had eyes that beheld us； doubly so。 We strapped our ponchos； heavy with their food； to our backs； and set out at random across the cavern。
We went slowly； straining our eyes ahead and from side to side。 It was folly； of course； in the darkness…like trying to beat a gambler at his own game。 But we moved on as noiselessly as possible。
Suddenly a wall loomed up before us not ten feet away。 I gave a tug at Harry's arm； and he nodded。 We approached the wall； then turned to the right and proceeded parallel with it； watching for a break that would mean the way to freedom。
I noticed a dark line that extended along the base of the wall； reaching up its side to a height of about two feet and seemingly melting away into the ground。 At first I took it for a separate strata of rock； darker than that above。 But there was a strange brokenness about its appearance that made me consider it more carefully。
It appeared to be posed of curious knots and protuberances。
I stopped short； and； advancing a step or two toward the wall； gazed intently。 Then I saw that the dark line was not a part of the wall at all； and then…well； then I laughed aloud in spite of myself。 The thing was too ludicrous。
For that 〃dark line〃 along the bottom of the wall was a row of squatting Incas！ There they sat； silent； motionless； even when my laugh rang out through the cavern they gave not the slightest sign that they either heard or saw。 Yet it was certain that they had watched our every move。
There was nothing for it but retreat。 With our knives we might have fought our way through； but we were unarmed； and we had felt one or two proofs of their strength。
Harry took it with more philosophy than I had expected。 As for me； I had not yet finished my laugh。 We sought our former resting…place； recognizing it by the platter and basin which we had emptied before our famous and daring attempt to escape。
Soon Harry began：
〃I'll tell you what they are； Paul； they're frogs。 Nothing but frogs。 Did you see 'em？ The little black devils！ And Lord； how they smell！〃
〃That；〃 I answered； 〃is the effect of…〃
〃To the deuce with your mineralogy or anthromorphism or whatever you call it。 I don't care what makes 'em smell。 I only know they do…as Kipling says of the oonts…'most awful vile。' And there the beggars sit； and here we sit！〃
〃If we could only see…〃 I began。
〃And what good would that do us？ Could we fight？ No。 They'd smother us in a minute。 Say； wasn't there a king in that cave the other day？〃
〃Yes； on a golden throne。 An ugly little devil…the ugliest of all。〃
〃Sure； that why he's got the job。 Did he say anything？〃
〃Not a word； merely stuck out his arm and out we went。〃
〃Why the deuce don't they talk？〃
I explained my theory at some length； with many and various scientific digressions。 Harry listened politely。
〃I don't know what you mean；〃 said he when I had finished； 〃but I believe you。 Anyway； it's all a stupendous joke。 In the first place； we shouldn't be here at all。 And； secondly； why should they want us to stay？〃
〃How should I know？ Ask the king。 And don't bother me； I'm going to sleep。〃
〃You are not。 I want to talk。 Now； they must want us for something。 They can't intend to eat us； because there isn't enough to go around。 And there is Desiree。 What the deuce was she doing up there without any clothes on？ I say； Paul； we've got to find her。〃
〃With pleasure。 But； first； how are we going to get out of this？〃
〃I mean； when we get out。〃
Thus we rattled on； arriving nowhere。 Harry's loquacity I understood； the poor lad meant to show me that he had resolved not to 〃whine。〃 Yet his cheerfulness was but partly assumed； and it was most wele。 My own temper was getting sadly frayed about the edge。
We slept through another watch uneventfully； and when we woke found our platter of fish and basin of water beside us。 I estimated that some seventy…two hours had then passed since we had been carried from the cavern； Harry said not l