In the Technologiste for 1848, M. Niepce de Saint-Victor published his mode of applying albumen to glass plates. M. Blanquart Everard followed, and successively albumen, gelatine, and serum were employed. Messrs. Ross and Thomson, of Edinburgh, have been eminently successful operators with albumen on glass plates, many of their pictures leaving little to be desired. The manipulatory details of the albumen process will be found in the technical division of this work.