PHOTOGRAPHY WITH EMULSIONS: A TREATISE ON THE THEORY AND PRACTICAL WORKING OF GELATINE AND COLLODION EMULSION PROCESSES.
NY: Scovill Manufacturing Company, 1886. Abney. Second American edition. 8vo., vii, 192 pp., 36 pp. adverts, engraved illustrations. Printed stiff wrappers. The wrappers are lightly chipped, worn and stained; the first 75 pages have a small stain limited to the fore edge. Owner's ink stamp on the title page. A very good copy. Item #54290
A most important manual that covers all processes being practiced during this period with hundreds of emulsion processes and developers detailed in full. Also includes unusual approaches such as beer and coffee preservatives and how to color (safelight) darkroom windows. Abney made important contributions in the field, i.e. hydroquinone as developer  and silver gelatino citrochloride printing-out paper.
Roosens and Salu No. 3516 calls this the second edition and fails to note the 1883 Scovil printing, which is an exact replical of this edition.