This volume serves as the comprehensive index to the extensive diary collection of William Ewart Gladstone, providing a systematic key to the political and personal life of a central figure in 19th-century British governance. The work functions as a scholarly apparatus for the preceding thirteen volumes, offering researchers and historians a structured method to navigate the vast documentation of Gladstone's public and private activities between 1830 and 1896. By cataloging persons, subjects, and reading habits, the volume transforms the raw chronological entries into a searchable database of Victorian-era history.

Scholars and historians regard this index as a foundational reference tool for any serious study of Gladstone or the political landscape of the Victorian period. The text is noted for its meticulous organization, which is essential for navigating the dense, multi-decade record of one of Britain's most significant statesmen.