Таємничий острів

           Onthisgroundheplacedalayerofbranchesandchoppedwood,onwhichwerepiledsomepiecesofshistosepyrites,buttressedoneagainsttheother,thewholebeingcoveredwithathinlayerofpyrites,previouslyreducedtothesizeofanut.

           Thisdone,theysetfiretothewood,theheatwascommunicatedtotheshist,whichsoonkindled,sinceitcontainscoalandsulphur.Thennewlayersofbruisedpyriteswerearrangedsoastoformanimmenseheap,theexteriorofwhichwascoveredwithearthandgrass,severalair-holesbeingleft,asifitwasastackofwoodwhichwastobecarbonizedtomakecharcoal.

           Theythenleftthetransformationtocompleteitself,anditwouldnottakelessthantenortwelvedaysforthesulphuretofirontobechangedtosulphateofironandthealuminaintosulphateofalumina,twoequallysolublesubstances,theothers,flint,burntcoal,andcinders,notbeingso.

           Whilethischemicalworkwasgoingon,CyrusHardingproceededwithotheroperations,whichwerepursuedwithmorethanzeal,itwaseagerness.

           NebandPencrofthadtakenawaythefatfromthedugong,andplaceditinlargeearthenpots.Itwasthennecessarytoseparatetheglycerinefromthefatbysaponifyingit.Now,toobtainthisresult,ithadtobetreatedeitherwithsodaorlime.Infact,oneorotherofthesesubstances,afterhavingattackedthefat,wouldformasoapbyseparatingtheglycerine,anditwasjustthisglycerinewhichtheengineerwishedtoobtain.

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