1924. Fifth Edition. 251 pages. No dust jacket. Red cloth. Contains a plate 'Presented to the Royal Institution of Great Britain by the Author', dated 26 Nov 1924. Black and white illustrations throughout. Pages are moderately tanned with noticeable foxing throughout. Page stuck to rear pastedown coming loose. Slight crinkling to paper at gutters, however binding remains firm. Occasional dog-eared corners. Illustrations are bright and clear, with some light tanning and foxing to edges. Boards have heavy edge wear with corner bumping. Moderate tanning to spine and edges with some crushing to spine ends. Gilt lettering is darkened. heavy mottling with bleaching marks to both boards. Book has a slight forward lean.