London: Methuen & Co. Ltd., 1923.
First British edition. xiii, , 626, , 8 pp. Brown cloth with blind stamped front board, gilt lettered spine. A Very Good+ copy with slightly mottled cloth, head and tail a little worn, offsetting to endpapers, nice shape overall. Lacking jacket. The first book by the German theoretical physicist who trained many future Nobel laureates, published in the original German in 1919. Item #140939911