The invaluable school history of  india was  constantly revised by the author until his death in 1920.in many ways it is superior to the better known  oxford history of india and is distinguished by its scrupulous accuracy of statement and impartiality of judegment .the work of revision has consisted chiefly in adding information , the work of revision has  consisted chiefly in adding information which has subsequently become available and in carrying the narrative  and choronology of the latter period to the end of 1949.