The preparation of another revision of the Architecture of Greece and Rome had been considered before the outbreak of the First World War; at that time the plan was to republish the book merely with verbal emendations and corrections, leaving it as a whole essential unaltered. But when the project was taken up again the delay caused by the war, the outlook had changed; it seemed preferable to make the revisiob as thorough as might be necessary in order to make the book more useful and attractive to students, and to embody more of the latest results of excavation and research. To that end the book was divided into its two component parts, each half being entrusted by Mr. Harry Batsford to a specialist in the field concerned.