WhenIreturnedtopartiallifemyfacewaswetwithtears. HowlongthatstateofinsensibilityhadlastedIcannotsay. Ihadnomeansnowoftakingaccountoftime. Neverwassolitudeequaltothis,neverhadanylivingbeingbeensoutterlyforsaken. AftermyfallIhadlostagooddealofblood.Ifeltitflowingoverme.Ah! howhappyIshouldhavebeencouldIhavedied,andifdeathwerenotyettobegonethrough.Iwouldthinknolonger. Idroveawayeveryidea,and,conqueredbymygrief,Irolledmyselftothefootoftheoppositewall. AlreadyIwasfeelingtheapproachofanotherfaint,andwashopingforcompleteannihilation,whenaloudnoisereachedme. Itwaslikethedistantrumbleofcontinuousthunder,andIcouldhearitssoundingundulationsrollingfarawayintotheremoterecessesoftheabyss. Whencecouldthisnoiseproceed?ItmustbefromsomephenomenonproceedinginthegreatdepthsamidstwhichIlayhelpless.Wasitanexplosionofgas? Wasitthefallofsomemightypillaroftheglobe? Ilistenedstill.Iwantedtoknowifthenoisewouldberepeated.Aquarterofanhourpassedaway.Silencereignedinthisgallery.Icouldnotheareventhebeatingofmyheart. Suddenlymyear,restingbychanceagainstthewall,caught,orseemedtocatch,certainvague,indescribable,distant,articulatesounds,asofwords. "Thisisadelusion,"Ithought. Butitwasnot.Listeningmoreattentively,Iheardinrealityamurmuringofvoices.Butmyweaknesspreventedmefromunderstandingwhatthevoicessaid.Yetitwaslanguage,Iwassureofit. ForamomentIfearedthewordsmightbemyown,broughtbackbytheecho.PerhapsIhadbeencryingoutunknowntomyself.Iclosedmylipsfirmly,andlaidmyearagainstthewallagain. "Yes,truly,someoneisspeaking;thosearewords!" EvenafewfeetfromthewallIcouldheardistinctly. Isucceededincatchinguncertain,strange,undistinguishablewords. Theycameasifpronouncedinlowmurmuredwhispers. Theword'forlorad'wasseveraltimesrepeatedinatoneofsympathyandsorrow. "Help!"Icriedwithallmymight."Help!" Ilistened,Iwatchedinthedarknessforananswer,acry,amerebreathofsound,butnothingcame.Someminutespassed. Awholeworldofideashadopenedinmymind. Ithoughtthatmyweakenedvoicecouldneverpenetratetomycompanions. "Itisthey,"Irepeated."Whatothermencanbethirtyleaguesunderground?" Iagainbegantolisten.Passingmyearoverthewallfromoneplacetoanother,Ifoundthepointwherethevoicesseemedtobebestheard. Theword'forlorad'againreturned;thentherollingofthunderwhichhadrousedmefrommylethargy. "No,"Isaid,"no;itisnotthroughsuchamassthatavoicecanbeheard. Iamsurroundedbygranitewalls,andtheloudestexplosioncouldneverbeheardhere!Thisnoisecomesalongthegallery. Theremustbeheresomeremarkableexerciseofacousticlaws!" Ilistenedagain,andthistime,yesthistime,Ididdistinctlyhearmynamepronouncedacrossthewideinterval. Itwasmyuncle'sownvoice!Hewastalkingtotheguide.And'forlorad'isaDanishword. ThenIunderstooditall.Tomakemyselfheard,Imustspeakalongthiswall,whichwouldconductthesoundofmyvoicejustaswireconductselectricity. Buttherewasnotimetolose.Ifmycompanionsmovedbutafewstepsaway,theacousticphenomenonwouldcease.Ithereforeapproachedthewall,andpronouncedthesewordsasclearlyaspossible: Iwaitedwiththedeepestanxiety.Sounddoesnottravelwithgreatvelocity. Evenincreaseddensityairhasnoeffectuponitsrateoftravelling;itmerelyaugmentsitsintensity. Seconds,whichseemedages,passedaway,andatlastthesewordsreachedme: "Lost,inthedeepestdarkness." "Wait!Iamexhausted!Ican'tanswer.Speaktome!" "Courage,"resumedmyuncle."Don'tspeak.Listentome. Wehavelookedforyouupthegalleryanddownthegallery.Couldnotfindyou.Iweptforyou,mypoorboy. Atlast,supposingyouwerestillontheHansbach,wefiredourguns. Ourvoicesareaudibletoeachother,butourhandscannottouch.Butdon'tdespair,Axel! Itisagreatthingthatwecanheareachother." DuringthistimeIhadbeenreflecting.Avaguehopewasreturningtomyheart.TherewasonethingImustknowtobeginwith.Iplacedmylipsclosetothewall,saying: "Myboy!"cametomeafterafewseconds. "Wemustknowhowfarweareapart." "Youhaveyourchronometer?" "Well,takeit.Pronouncemyname,notingexactlythesecondwhenyouspeak.Iwillrepeatitassoonasitshallcometome,andyouwillobservetheexactmomentwhenyougetmyanswer." "Yes;andhalfthetimebetweenmycallandyouranswerwillexactlyindicatethatwhichmyvoicewilltakeincomingtoyou." "Now,attention.Iamgoingtocallyourname." Iputmyeartothewall,andassoonasthename'Axel'cameIimmediatelyreplied"Axel,"thenwaited. "Fortyseconds,"saidmyuncle."Fortysecondsbetweenthetwowords;sothesoundtakestwentysecondsincoming. Now,attherateof1,120feetinasecond,thisis22,400feet,orfourmilesandaquarter,nearly." "Fourmilesandaquarter!"Imurmured. "Down–forthisreason:Weareinavastchamber,withendlessgalleries. Yoursmustleadintoit,foritseemsasifallthecleftsandfracturesofthegloberadiatedroundthisvastcavern.Sogetup,andbeginwalking. Walkon,dragyourselfalong,ifnecessaryslidedownthesteepplaces,andattheendyouwillfindusreadytoreceiveyou.Nowbeginmoving." "Goodbye,uncle."Icried."Iamgoing.TherewillbenomorevoicesheardwhenonceIhavestarted.Sogoodbye!" ThesewerethelastwordsIheard. Thiswonderfulundergroundconversation,carriedonwithadistanceoffourmilesandaquarterbetweenus,concludedwiththesewordsofhope. IthankedGodfrommyheart,foritwasHewhohadconductedmethroughthosevastsolitudestothepointwhere,aloneofallothersperhaps,thevoicesofmycompanionscouldhavereachedme. Thisacousticeffectiseasilyexplainedonscientificgrounds. Itarosefromtheconcaveformofthegalleryandtheconductingpoweroftherock. Therearemanyexamplesofthispropagationofsoundswhichremainunheardintheintermediatespace. Irememberthatasimilarphenomenonhasbeenobservedinmanyplaces;amongstothersontheinternalsurfaceofthegalleryofthedomeofSt.Paul'sinLondon,andespeciallyinthemidstofthecuriouscavernsamongthequarriesnearSyracuse,themostwonderfulofwhichiscalledDionysius'Ear. Theseremembrancescameintomymind,andIclearlysawthatsincemyuncle'svoicereallyreachedme,therecouldbenoobstaclebetweenus. Followingthedirectionbywhichthesoundcame,ofcourseIshouldarriveinhispresence,ifmystrengthdidnotfailme. Ithereforerose;Iratherdraggedmyselfthanwalked.Theslopewasrapid,andIsliddown. Soontheswiftnessofthedescentincreasedhorribly,andthreatenedtobecomeafall.Inolongerhadthestrengthtostopmyself. Suddenlytherewasnogroundunderme.Ifeltmyselfrevolvinginair,strikingandreboundingagainstthecraggyprojectionsofaverticalgallery,quiteawell;myheadstruckagainstasharpcorneroftherock,andIbecameunconscious.