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Chapter 23. “Aegri Somnia”

           WouldhecomebackatlasttothePacific,wherehisNautiluscouldsailfreeandindependently?Timewouldshow.

           AfterhavingskirtedthesandsofCartier,ofHibernia,Seringapatam,andScott,lasteffortsofthesolidagainsttheliquidelement,onthe14thofJanuarywelostsightoflandaltogether.ThespeedoftheNautiluswasconsiderablyabated,andwithirregularcourseshesometimesswaminthebosomofthewaters,sometimesfloatedontheirsurface.

           Duringthisperiodofthevoyage,CaptainNemomadesomeinterestingexperimentsonthevariedtemperatureofthesea,indifferentbeds.Underordinaryconditionstheseobservationsaremadebymeansofrathercomplicatedinstruments,andwithsomewhatdoubtfulresults,bymeansofthermometricalsounding-leads,theglassesoftenbreakingunderthepressureofthewater,oranapparatusgroundedonthevariationsoftheresistanceofmetalstotheelectriccurrents.Resultssoobtainedcouldnotbecorrectlycalculated.Onthecontrary,CaptainNemowenthimselftotestthetemperatureinthedepthsofthesea,andhisthermometer,placedincommunicationwiththedifferentsheetsofwater,gavehimtherequireddegreeimmediatelyandaccurately.

           Itwasthusthat,eitherbyoverloadingherreservoirsorbydescendingobliquelybymeansofherinclinedplanes,theNautilussuccessivelyattainedthedepthofthree,four,five,seven,nine,andtenthousandyards,andthedefiniteresultofthisexperiencewasthattheseapreservedanaveragetemperatureoffourdegreesandahalfatadepthoffivethousandfathomsunderalllatitudes.

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