This volume serves as the definitive navigational tool for the extensive primary source record of W. E. Gladstone’s political and personal life. As a comprehensive index to the preceding thirteen volumes of diaries, cabinet minutes, and correspondence, this work provides a structured framework for accessing the vast data contained within the collection. It functions as a scholarly apparatus designed to facilitate research into the intricacies of nineteenth-century British governance and the personal intellectual development of one of the era's most prominent figures.

Historians and researchers regard this volume as an indispensable reference tool for navigating the complexities of the Gladstone archive. The index is frequently cited for its meticulous organization and its utility in connecting disparate historical events within the Victorian era.