Bromide of Potassium.
Bichromates.
Ammonium, Potassium and Sodium.
Powdered Dragon Blood, Light Colored and Dark.
Metcalf Powdered Bitumen of Judea.
:: ALSO ::
Syrian Asphaltum.
Benzole, Chemically Pure,
By Can or Barrel.
Etc., Etc., Etc.

Boston, U. S. A.

The Grammar of Photo-Engraving.

BY H. D. FARQUHAR.

(Number Forty-five of the Scovill Photographic Series.)
CONTAINING INSTRUCTION IN
Drawing, Chemistry and Optics, as applied to Photo-Engraving.
AND A PRACTICAL TREATISE ON THE ART OF
Half-Tone, Zinc Etching, Swelled Gelatine, Lithotype and
Chalk Plate Engraving, as Practiced in the
United States.

ILLUSTRATED.