1903. Second edition. 152 pages. No dust jacket. Red cloth covered boards with gilt. Black and white diagrams. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have heavy shelf wear with bumping and fraying to corners and crushing, fraying and tearing to spine ends and edges. All surfaces heavily tanned, particularly spine. Some additional moderate rubbing marks and staining. Gilt lettering remains bright and clear. Boards are slightly bowed.