1914. 164 pages. No dust jacket. Red cloth with gilt lettering. Introduction by Sir Oliver Lodge. Rough cut pages are moderately tanned and thumbed at the edges, creased corners and foxing. Binding has remained firm. Boards are a little rub worn with slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are a mildly crushed, with small splits and chips. Tanning to spine and edges. Boards are bowed. Book has a forward lean. Water marks to boards and spine.