Differences in the dates of events are not unfrequent, occur ring chie?y in translations of Muhammadan histories, — arising partly perhaps from inattention in computing the European from the Hijra reckoning — but also from other sources, — and it is difficult to rectify such differences when they amount to a year or more. When careful research is applied to such matters, cases of the kind will in course of time be cleared up; and though none of them are of great importance, they may be corrected when a second edition of this handbook is required.