1926. No edition remarks. 58 pages. No dust jacket. Pictorial paper covered boards with cloth spine. Colour illustration plates and black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Some cracking to gutters with exposed netting. Binding loose. Boards have moderate shelf wear with mild bumping and rubbing to corners and crushing and fraying to spine ends. All surfaces moderately tanned. Boards are slightly bowed.