Paris: Gauthier-Villars, 1880. First edition. Small 4to., viii, 58 pp., illustrated. Printed paper wrappers; remnant of a paper label affixed to the top of the front wrapper, slight foxing; very good and unopened. Item #26644
Eder in HISTORY OF PHOTOGRAPHY mentions this title along with those by Abney, Burgess, and Monckhoven, as "some of the earliest technical literature on gelatin silver bromide..." an important advancement in photographic printing.
Roosens and Salu No. 1138.