THE HISTORY AND PRACTICE OF THE ART OF PHOTOGRAPHY; OR THE PRODUCTION OF PICTURES THROUGH THE AGENCY OF LIGHT. CONTAINING ALL THE INSTRUCTIONS NECESSARY FOR THE COMPLETE PRACTICE OF THE DAGUERREAN AND PHOTOGENIC ART, BOTH ON METALIC, PLATES AND ON PAPER. By HENRY H. SNELLING. ILLUSTRATED WITH WOOD CUTS. New York: PUBLISHED BY G. P.