Paris: Gauthier-Villars, Imprimeur-Libraire, 1870. Paperback. SIGNED PRESENTATION COPY. 8vo. Signed by author on front wrapper. Beige paper wrappers with black title to front wrapper. Browning to front wrapper as well as one very small open tear. Minor chipping and creasing to edges of wrappers. Minor browning to edges as well as minor foxing throughout. Text is clean and bright with many graphs and illustrations. 66 pages. SCI/042408. Very Good.