ChapterLII:MoreConquestsByTheArabs。
PartI。
TheTwoSiegesOfConstantinopleByTheArabs。—TheirInvasionOfFrance，AndDefeatByCharlesMartel。—CivilWarOfTheOmmiadesAndAbbassides。—LearningOfTheArabs。—LuxuryOfTheCaliphs。—NavalEnterprisesOnCrete，Sicily，AndRome。—
DecayAndDivisionOfTheEmpireOfTheCaliphs。—DefeatsAndVictoriesOfTheGreekEmperors。
WhentheArabsfirstissuedfromthedesert，theymusthavebeensurprisedattheeaseandrapidityoftheirownsuccess。