Difference between the tombs of the Israelites and those of the Egyptians--The reason for this--Jewish catacombs at Rome--Christian catacombs--Puticoli--Numerous catacombs--Those of Syracuse--Those of Paris--Crypts became vaults for kings and nobles--Desecration--That of Louis XI.--The instinct of immortality--Cave burials--In the Petit Morin--Scandinavian burials--Death regarded as suspended animation-- Hervor at the cairn of Angantyr--The cairn-breaking of Gest--The barrow of Gunnar--Sigrun visits her husband in his cairn--The story of Asmund and Asvid--The same ideas in Christian times--Mamertinus and Corcodemus--"De Miraculis Mortuorum"--Ancestor worship--Persistence of usages derived from a remote antiquity--Neglect of thought of the dead --Double nature of man--The spiritual world--A walking postman-- Conclusion INDEX LIST OF ILLUSTRATIONS CLIFF CASTLE, BRENGUES CAVE DWELLERS AT DUCLAIR SAULIAC (_Photo by_ GIBMA) GRIOTEAUX LA ROCHEBRUNE SKETCH PLAN OF ROCK STABLE, COMMARQUES PLAN OF ROCK HOLES IN NOTTINGHAM PARK DRAKELOW AUBETERRE PLAN OF THE REFUGE OF CHÂTEAU ROBIN THE CHÂTEAU OF FAYROLLES CLUSEAU DE FAUROUX LA ROCHE GAGEAC LE PEUCH S. SOUR CAVES OF MESCHERS CAVE REFUGE AT SOULIER DE CHASTEAU LE DÉFILÉ DES ANGLAIS, LOT (_Photo by_ BAUDEL, S. CÉRÉ) CHÂTEAU DES ANGLAIS, BRENGUES CHÂTEAU DU DIABLE, CABRERETS (EXTERIOR) CHÂTEAU DU DIABLE, CABRERETS (INTERIOR) (_Photo by_ BAUDEL, S. CÉRÉ) CORN, LOT (_Photo by_ BAUDEL, S. CÉRÉ) CHÂTEAU DES ANGLAIS, AUTOIRE (_Photo by_ BAUDEL, S. CÉRÉ) COVOLO LA ROCHE DU TAILLEUR KRONMETZ THE PUXERLOCH, STYRIA HABICHSTEIN, BOHEMIA ROCK MONASTERY, NOTTINGHAM PARK ROCK MONASTERY, NOTTINGHAM PARK LA ROCHE CORAIL LA ROCHE CORAIL THE FIRST HALL GUÉ DE LOIR LES ROCHES PLAN OF MARTYRIUM MONOLITHIC CHURCH OF S. EMILION AUBETERRE, CHARENTE, INTERIOR OP MONOLITHIC CHURCH (_Photo by_ DELAGE) ROCAMADOUR (_Photo by_ BAUDEL, S. CÉRÉ) AUBETERRE, CHARENTE (_Photo by_ DELAGE) SUBTERRANEAN CHURCH, AUBETERRE (_Photo by_DELAGE) DOLMEN CHAPEL OF THE SEVEN SLEEPERS PLAN OF DOLMEN CHAPEL NEAR PLOUARET PLAN OF CHAPEL OF S. AMADOU SCULPTURE IN ROYSTON CAVE (_Photo by_ R.H. CLARK, ROYSTON) SCULPTURE IN ROYSTON CAVE (_Photo by_ R.H. CLARK, ROYSTON) ROYSTON CAVE (_Photo by_ R. H. CLARK, ROYSTON) CHATEAU DE RIGNAC LE TROU BOUROU ROCK BAPTISTERY OF ST. MARTIN TRIUMPH OF CHRIST OVER DEATH (_Photo by_ LACROIX) CAVES OF LIGUGÉ NESS CLIFF KYNASTON'S CAVE CLIFF CASTLES AND CAVE DWELLINGS OF EUROPE CHAPTER I PREHISTORIC CAVE-DWELLERS