\"Butthatistheextremelimitallowedbyscienceforthethicknessoftheearth\'scrust，\"Ireplied，referringtomygeologicalstudies。
\"Idonotcontravenethatassertion，\"washisquietanswer。
\"Andatthisstageofourjourney，accordingtoallknownlawsontheincreaseofheat，thereshouldbehereatemperatureoffifteenhundreddegreesofReaumur。\"
\"Thereshouldbe-yousay，myboy。\"
\"Inwhichcasethisgranitewouldnotexist，butbeinastateoffusion。\"