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Chapter 4. Ned Land

           "Well,Ned,Irepeatitwithaconvictionrestingonthelogicoffacts.Ibelieveintheexistenceofamammalpowerfullyorganised,belongingtothebranchofvertebrata,likethewhales,thecachalots,orthedolphins,andfurnishedwithahornofdefenceofgreatpenetratingpower."

           "Hum!"saidtheharpooner,shakinghisheadwiththeairofamanwhowouldnotbeconvinced.

           "Noticeonething,myworthyCanadian,"Iresumed."Ifsuchananimalisinexistence,ifitinhabitsthedepthsoftheocean,ifitfrequentsthestratalyingmilesbelowthesurfaceofthewater,itmustnecessarilypossessanorganisationthestrengthofwhichwoulddefyallcomparison."

           "Andwhythispowerfulorganisation?"demandedNed.

           "Becauseitrequiresincalculablestrengthtokeepone’sselfinthesestrataandresisttheirpressure.Listentome.Letusadmitthatthepressureoftheatmosphereisrepresentedbytheweightofacolumnofwaterthirtytwofeethigh.Inrealitythecolumnofwaterwouldbeshorter,aswearespeakingofseawater,thedensityofwhichisgreaterthanthatoffreshwater.Verywell,whenyoudive,Ned,asmanytimes32feetofwaterasthereareaboveyou,somanytimesdoesyourbodybearapressureequaltothatoftheatmosphere,thatistosay,15lb.foreachsquareinchofitssurface.Itfollows,then,thatat320feetthispressureequalsthatof10atmospheres,of100atmospheresat3,200feet,andof1,000atmospheresat32,000feet,thatis,about6miles;whichisequivalenttosayingthatifyoucouldattainthisdepthintheocean,eachsquarethree-eighthsofaninchofthesurfaceofyourbodywouldbearapressureof5,600lb.Ah!mybraveNed,doyouknowhowmanysquareinchesyoucarryonthesurfaceofyourbody?"

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