Eighteen years ago F. W. Maitland edited for the Selden Society the first volume of the Year Books of Edward II. In his introduction to that volume, moved by a pardonable enthusiasm, he wrote-perhaps not altogether advisedly— “It will some day seem a wonderful thing that men once thought that they could write the history of mediaeval England without using the Year Books.”. Since then that sentence has been frequently repeated, although it is to be feared that for the most part historians have turned a deaf ear to its warning: and lately Mr. W. C. Bolland, who has himself edited several volumes of Year Books for the same Society, has reiterated Maitland's plea and, going further, has drawn a damaging comparison between the Year Books and the Plea Rolls. The Year Books, we are told, “are the living body, acting and speaking and thinking and wrangling and changing its mind on the pressure of the moment”: while the Plea Rolls present “the skeleton, the dry bones of the bare facts.” It is true that Mr. Bolland is careful to explain that the Year Book and the Roll each contain matter which is absent from the other, and that for historical purposes neither is complete without the other: but there is no doubt that the general impression left by Mr. Bolland's lectures is that the Year Books are of high historical value, that they contain, in his own words, “innumerable matters of interest, legal, historical, constitutional and social, about which the record is entirely silent.”