ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the Academy of Sciences in Paris. The Lenses of these Eye-pieces are so constructed that the rays of light fall nearly perpendicular to the surface of the various lenses, by which the aberration is completely removed; and a telescope so fitted give one-third more magnifying power and light than could be obtained by the old Eye-pieces. Prices of the various sizes on application to WM. ACKLAND, Optician, 93. Hatton Garden, London. * * * * * STEEL PENS.--PARTRIDGE & COZEN'S STEEL PENS are the best; made of the purest steel, all selected and warranted. Fine or medium points, 1s. 3d. per box of twelve dozen; broad ditto, 1s. 6d.; extra broad, 1s. 6d., a very easy pen--will write with comfort on brown paper; correspondence pen, 1s. 3d. per box--this pen adapts itself to any hand. P. & C. are the original makers, and although there are many imitations, it is still unequalled. Best magnum bonums, 3s. 6d. per gross; silver pens, 1s., and gold ditto, 2s. each, warranted; patent holders, fit any pen, 6d. dozen, or 5s. gross. A liberal allowance to shippers and the trade. Samples per post, on receipt of six stamps. PARTRIDGE & COZEN'S Cheap Stationery Warehouses, 127. and 128. Chancery Lane. * * * * * JUST PUBLISHED.--A CATALOGUE OF CURIOUS BOOKS, by J. CROZIER, 5. New Turnstile, near Lincoln's Inn Fields, Holborn. Catalogues sent on receipt of One Postage Stamp. {443} * * * * * PREPARING FOR IMMEDIATE PUBLICATION. PHOTOGRAPHIC NOTES: Comprising Plain Directions for the Practice of Photography, including the Collodion Process on Glass; the Paper and Wax-Paper Processes; Printing from Glass and Paper Negatives, &c. By DR. DIAMOND, F.S.A. With Notes on the Application of Photography to Archæology, &c., By WILLIAM J. THOMS, F.S.A. London: GEORGE BELL, 186, Fleet Street. * * * * * PHOTOGRAPHIC SCHOOL.--ROYAL POLYTECHNIC INSTITUTION. The spacious Plate Glass House, 30 feet by 15, with the Class Rooms and Ladies' Apartment, being nearly completed. Classes or Private Lessons, embracing all branches of Photography, will commence May 2nd, 1853, for Gentlemen, and May 3rd, for Ladies. A perfect Apparatus with Ross's finest Lenses has been procured, and every new improvement will be added. The School will be under the joint direction of T. A. MALONE, Esq., who has been long connected with Photography, and J. H. PEPPER, Esq., the Chemist to the Institution. A Prospectus, with terms, may be had at the Institution. * * * * * 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.