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The Rescue in the Whispering Gallery

           "Downforthisreason:Weareinavastchamber,withendlessgalleries.Yoursmustleadintoit,foritseemsasifallthecleftsandfracturesofthegloberadiatedroundthisvastcavern.Sogetup,andbeginwalking.Walkon,dragyourselfalong,ifnecessaryslidedownthesteepplaces,andattheendyouwillfindusreadytoreceiveyou.Nowbeginmoving."

           ....

           Thesewordscheeredmeup.

           "Goodbye,uncle."Icried."Iamgoing.TherewillbenomorevoicesheardwhenonceIhavestarted.Sogoodbye!"

           ....

           "Goodbye,Axel,aurevoir!"

           ....

           ThesewerethelastwordsIheard.

           Thiswonderfulundergroundconversation,carriedonwithadistanceoffourmilesandaquarterbetweenus,concludedwiththesewordsofhope.IthankedGodfrommyheart,foritwasHewhohadconductedmethroughthosevastsolitudestothepointwhere,aloneofallothersperhaps,thevoicesofmycompanionscouldhavereachedme.

           Thisacousticeffectiseasilyexplainedonscientificgrounds.Itarosefromtheconcaveformofthegalleryandtheconductingpoweroftherock.Therearemanyexamplesofthispropagationofsoundswhichremainunheardintheintermediatespace.

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