The aim of the present work is to extract as much information as possible from the early quartos of George Chapman's twelve plays by the various methods which analytical bibliography has recently developed, and to present the results in such a way as to be useful to a prospective editor of the plays. The present work, which has involved an entirely fresh examination of all the quartos, is an original contribution to Chapman studies, but it should also make a general contribution to analytical bibliography with special reference to Elizabethan and Jacobean printed plays. The main body of the present thesis comprises an introduction with a bibliographical description of the play studied; four chapters on, respectively, the nature of the printer's copy, variants, compositorial analyses, and on the characteristics of compositors; and a brief general conclusion. Appendices include bibliographical notes on the Chapman quartos. A bibliography has been provided at the end of the thesis.