* * * * * PHOTOGRAPHIC PICTURES.--A Selection of the above beautiful Productions (comprising Views in VENICE, PARIS, RUSSIA, NUBIA, &c.) may be seen at BLAND & LONG'S, 153. Fleet Street, where may also be procured Apparatus of every Description, and pure Chemicals for the practice of Photography in all its Branches. Calotype, Daguerreotype, and Glass Pictures for the Stereoscope. BLAND & LONG, Opticians, Philosophical and Photographical Instrument Makers, and Operative Chemists, 153. Fleet Street. * * * * * PHOTOGRAPHY.--Collodion (Iodized with the Ammonio-Iodide of Silver).--J. B. HOCKIN & CO., Chemists, 289. Strand, were the first in England who published the application of this agent (see _Athenaeum_, Aug. 14th). Their Collodion (price 9d. per oz.) retains its extraordinary sensitiveness, tenacity, and colour unimpaired for months; it may be exported to any climate, and the Iodizing Compound mixed as required. J. B. HOCKIN & CO. manufacture PURE CHEMICALS and all APPARATUS with the latest Improvements adapted for all the Photographic and Daguerreotype processes. Cameras for Developing in the open Country. GLASS BATHS adapted to any Camera. Lenses from the best Makers. Waxed and Iodized Papers, &c. * * * * * Just published, price 1s., free by Post 1s. 4d., THE WAXED-PAPER PHOTOGRAPHIC PROCESS of GUSTAVE LE GRAY'S NEW EDITION. Translated from the French. Sole Agents in the United Kingdom for VOIGHTLANDER & SON'S celebrated Lenses for Portraits and Views. General Depot for Turner's, Whatman's, Canson Freres', La Croix, and other Talbotype Papers. Pure Photographic Chemicals. Instructions and Specimens in every Branch of the Art. GEORGE KNIGHT & SONS, Foster Lane, London. * * * * * PHOTOGRAPHIC PAPER.--Negative and Positive Papers of Whatman's, Turner's, Sanford's, and Canson Freres' make, Waxed-Paper for Le Gray's Process. Iodized and Sensitive Paper for every kind of Photography. Sold by JOHN SANFORD, Photographic Stationer, Aldine Chambers, 13. Paternoster Row, London. * * * * * BENNETT'S MODEL WATCH, as shown at the GREAT EXHIBITION, No. 1. Class X., in Gold and Silver Cases, in five qualities, and adapted to all Climates, may now be had at the MANUFACTORY, 65. CHEAPSIDE. Superior Gold London-made Patent Levers, 17, 15, and 12 guineas. Ditto, in Silver Cases, 8, 6, and 4 guineas. First-rate Geneva Levers, in Gold Cases, 12, 10, and 8 guineas. Ditto, in Silver Cases, 8, 6, and 5 guineas. Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas. Bennett's Pocket Chronometer, Gold, 50 Guineas; Silver, 40 guineas. Every Watch skilfully examined, timed, and its performance guaranteed. Barometers, 2l., 3l., and 4l. Thermometers from 1s. each.