1918. Eleventh edition. 580 pages. No dust jacket. Fully bound red leather with gilt. Black and white diagrams throughout. Presentation plate to front pastedown. Gilt edges to textblock. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have moderate wear with bumped and abraded corners. Spine ends similarly worn and spine itself scuffed. Gilt slightly dulled. Board surfaces scratched and rubbed.