Paris: Société d'Éditions Scientifiques, 1891. First edition. 12mo., x, 93,  pp., figures in text. Contemporary half morocco gilt and marbled paper over boards. Near fine. Item #53931
A compendium of formulas as applied to making phototypes (collotypes] and photocopies. A second series was publishewd in 1892. Roosens and Salu No. 3987.