"Mr. Ross prepares lenses for Portraiture having the greatest intensity yet produced, by procuring the coincidence of the chemical actinic and visual rays. The spherical aberration is also very carefully corrected, both in the central and oblique pencils." "Mr. Ross has exhibited the best Camera in the Exhibition. It is furnished with a double achromatic object-lens, about three inches aperture. There is no stop, the field is flat, and the image very perfect up to the edge." A. R. invites those interested in the art to inspect the large Photographs of Vienna, produced by his Lenses and Apparatus. Catalogues sent upon Application. A. ROSS, 2. Featherstone Buildings, High Holborn * * * * * PHOTOGRAPHIC PICTURES.--A Selection of the above beautiful Productions 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. * * * * * PHOTOGRAPHIC PAPER.--Negative and Positive Papers of Whatman's, Turner's, Sanford's, and Canson Frères 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. * * * * * KERR & STRANG, Perfumers and Wig-Makers, 124. Leadenhall Street, London, respectfully inform the Nobility and Public that they have invented and brought to the greatest perfection the following leading articles, besides numerous others:--Their Ventilating Natural Curl; Ladies and Gentlemen's PERUKES, either Crops or Full Dress, with Partings and Crowns so natural as to defy detection, and with or without their improved Metallic Springs; Ventilating Fronts, Bandeaux, Borders, Nattes, Bands à la Reine, &c.; also their instantaneous Liquid Hair Dye, the only dye that really answers for all colours, and never fades nor acquires that unnatural red or purple tint common to all other dyes; it is permanent, free of any smell, and perfectly harmless. Any lady or gentleman, sceptical of its effects in dyeing any shade of colour, can have it applied, free of any charge, at KERR & STRANG'S, 124. Leadenhall Street. Sold in Cases at 7s. 6d., 15s., and 20s. Samples, 3s. 6d., sent to all parts on receipt of Post-office Order or Stamps. * * * * * LOST.--Two Water-coloured Drawings by MR. DELAMOTTE [engraved in 2nd volume of "Journal of Archæological Institute"] of distemper Paintings in Stanton Harcourt Church. Any person having them, is requested to return them to their owner, MR. DYKE, Jesus College, Oxford. * * * * *