Thetotallengthofthischasm，commencingattheopeningaandproceedingroundthecurve_b_totheextremity_d_，isfivehundredandfiftyyards。At_c_wediscoveredasmallaperturesimilartotheonethroughwhichwehadissuedfromtheotherchasm，andthiswaschokedupinthesamemannerwithbramblesandaquantityofthewhitearrowheadflints。Weforcedourwaythroughit，findingitaboutfortyfeetlong，andemergedintoathirdchasm。This，too，waspreciselylikethefirst，exceptinitslongitudinalshape，whichwasthus。Seefigure3。{image}
Wefoundtheentirelengthofthethirdchasmthreehundredandtwentyyards。Atthepoint_a_wasanopeningaboutsixfeetwide，andextendingfifteenfeetintotherock，whereitterminatedinabedofmarl，therebeingnootherchasmbeyond，aswehadexpected。
Wewereaboutleavingthisfissure，intowhichverylittlelightwasadmitted，whenPeterscalledmyattentiontoarangeofsingular-lookingindenturesinthesurfaceofthemarlformingtheterminationofthe_cul-de-sac_。Withaveryslightexertionoftheimagination，theleft，ormostnorthernoftheseindenturesmighthavebeentakenfortheintentional，althoughrude，representationofahumanfigurestandingerect，withoutstretchedarm。Therestofthemborealsosomelittleresemblancetoalphabeticalcharacters，andPeterswaswilling，atallevents，toadopttheidleopinionthattheywerereallysuch。Iconvincedhimofhiserror，finally，bydirectinghisattentiontothefloorofthefissure，where，amongthepowder，wepickedup，piecebypiece，severallargeflakesofthemarl，whichhadevidentlybeenbrokenoffbysomeconvulsionfromthesurfacewheretheindentureswerefound，andwhichhadprojectingpointsexactlyfittingtheindentures；thusprovingthemtohavebeentheworkofnature。Figure4{image}presentsanaccuratecopyofthewhole。
Aftersatisfyingourselvesthatthesesingularcavernsaffordedusnomeansofescapefromourprison，wemadeourwayback，dejectedanddispirited，tothesummitofthehill。Nothingworthmentioningoccurredduringthenexttwenty-fourhours，exceptthat，inexaminingthegroundtotheeastwardofthethirdchasm，wefoundtwotriangularholesofgreatdepth，andalsowithblackgranitesides。
Intotheseholeswedidnotthinkitworthwhiletoattemptdescending，astheyhadtheappearanceofmerenaturalwells，withoutoutlet。Theywereeachabouttwentyyardsincircumference，andtheirshape，aswellasrelativepositioninregardtothethirdchasm，isshowninfigure5。{image}