HENRY G. BOHN, 4, 5, & 6. York Street, Covent Garden. * * * * * {530} 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. * * * * * IMPROVEMENT IN COLLODION.--J. B. HOCKIN & CO., Chemists, 289. Strand, have, by an improved mode of Iodizing, succeeded in producing a Collodion equal, they may say superior, in sensitiveness and density of Negative, to any other hitherto published; without diminishing the keeping properties and appreciation of half tint for which their manufacture has been esteemed. Apparatus, pure Chemicals, and all the requirements for the practice of Photography. Instruction in the Art. * * * * * ALLEN'S ILLUSTRATED CATALOGUE, containing Size, Price, and Description of upwards of 100 articles, consisting of PORTMANTEAUS, TRAVELLING-BAGS, Ladies' Portmanteaus, DESPATCH-BOXES, WRITING-DESKS, DRESSING-CASES, and other travelling requisites, Gratis on application, or sent free by Post on receipt of Two Stamps. MESSRS. ALLEN'S registered Despatch-box and Writing-desk, their Travelling-bag with the opening as large as the bag, and the new Portmanteau containing four compartments, are undoubtedly the best articles of the kind ever produced. J. W. & T. ALLEN, 18. & 22. West Strand. * * * * * W. H. HART, RECORD AGENT and LEGAL ANTIQUARIAN (who is in the possession of Indices to many of the early Public Records whereby his Inquiries are greatly facilitated) begs to inform Authors and Gentlemen engaged in Antiquarian or Literary Pursuits, that he is prepared to undertake searches among the Public Records, MSS. in the British Museum, Ancient Wills, or other Depositories of a similar Nature, in any Branch of Literature, History, Topography, Genealogy, or the like, and in which he has had considerable experience. 1. ALBERT TERRACE, NEW CROSS, HATCHAM, SURREY. * * * * *