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Exciting Discussions About an Unparalleled Enterprise

           "Becausethisliquidmasswouldbesubject,liketheocean,tothelunarattraction,andthereforetwiceeverydaytherewouldbeinternaltides,which,upheavingtheterrestrialcrust,wouldcauseperiodicalearthquakes!"

           "Yetitisevidentthatthesurfaceoftheglobehasbeensubjecttotheactionoffire,"Ireplied,"anditisquitereasonabletosupposethattheexternalcrustcooleddownfirst,whilsttheheattookrefugedowntothecentre."

           "Quiteamistake,"myuncleanswered."Theearthhasbeenheatedbycombustiononitssurface,thatisall.Itssurfacewascomposedofagreatnumberofmetals,suchaspotassiumandsodium,whichhavethepeculiarpropertyofignitingatthemerecontactwithairandwater;thesemetalskindledwhentheatmosphericvapoursfellinrainuponthesoil;andbyandby,whenthewaterspenetratedintothefissuresofthecrustoftheearth,theybrokeoutintofreshcombustionwithexplosionsanderuptions.Suchwasthecauseofthenumerousvolcanoesattheoriginoftheearth."

           "Uponmyword,thisisaverycleverhypothesis,"Iexclaimed,inspiteratherofmyself.

           "AndwhichHumphryDavydemonstratedtomebyasimpleexperiment.HeformedasmallballofthemetalswhichIhavenamed,andwhichwasaveryfairrepresentationofourglobe;wheneverhecausedafinedewofraintofalluponitssurface,itheavedupintolittlemonticules,itbecameoxydizedandformedminiaturemountains;acraterbrokeopenatoneofitssummits;theeruptiontookplace,andcommunicatedtothewholeoftheballsuchaheatthatitcouldnotbeheldinthehand."

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