OTTEWILL'S Registered Double Body Folding Camera, adapted for Landscapes or Portraits, may be had of A. ROSS. Featherstone Buildings, Holborn; the Photographic Institution, Bond Street; and at the Manufactory as above, where every description of Cameras, Slides, and Tripods may be had. The Trade supplied. * * * * * PHOTOGRAPHIC APPARATUS, MATERIALS, and PURE CHEMICAL PREPARATIONS. KNIGHT & SONS' Illustrated Catalogue, containing Description and Price of the best forms of Cameras and other Apparatus. Voightlander and Son's Lenses for Portraits and Views, together with the various Materials, and pure Chemical Preparations required in practising the Photographic Art. Forwarded free on receipt of Six Postage Stamps. Instructions given in every branch of the Art. An extensive Collection of Stereoscopic and other Photographic Specimens. GEORGE KNIGHT & SONS, Foster Lane, London. * * * * * COLLODION PORTRAITS AND VIEWS obtained with the greatest ease and certainty by using BLAND & LONG'S preparation of Soluble Cotton; certainty and uniformity of action over a lengthened period, combined with the most faithful rendering of the half-tones, constitute this a most valuable agent in the hands of the photographer. Albumenized paper, for printing from glass or paper negatives, giving a minuteness of detail unattained by any other method, 5s. per Quire. Waxed and Iodized Papers of tried quality. Instruction in the Processes. BLAND & LONG, Opticians and Photographical Instrument Makers, and Operative Chemists, 153. Fleet Street, London. *** Catalogues sent on application. * * * * * THE SIGHT preserved by the Use of SPECTACLES adapted to suit every variety of Vision by means of SMEE'S OPTOMETER, which effectually prevents Injury to the Eyes from the Selection of Improper Glasses, and is extensively employed by BLAND & LONG, Opticians, 153. Fleet Street, London. * * * * * {412} Sale of Photographic Pictures, Landscape Camera by Horne & Co.; Prints and Drawings. PUTTICK AND SIMPSON, Auctioneers of Literary Property, will SELL by AUCTION, at their Great Room, 191. Piccadilly, early in MAY, an important Collection of Photographic Pictures by the most celebrated Artists and Amateurs; comprising some _chefs d'oeuvre_ of the Art, amongst which are large and interesting Views taken in Paris, Rouen, Brussels, Switzerland, Rome, Venice, various parts of England and Scotland. Rustic Scenes, Architectural Subjects, Antiquities, &c. Also, some interesting Prints and Drawings. Catalogues will be sent on Application (if at a distance, on Receipt of Two Stamps.) * * * * *