THOMAS, R.W. The Modern Practice of Photography. Philadelphia, 1868. FIRST AMERICAN EDITION -- DAVIE, D.D.T. Secrets of the Dark Chamber, being Photographic Formulae, at Present Practiced in the Galleries of Messrs. Gurney, Fredricks, Bogardus, etc., of New York City... New York, 1870. One mounted photographic plate. FIRST EDITION. Together 2 volumes, various 8vo sizes, cloth bindings, condition varies. Roosens & Salu 6405; 3977. (2)