A panoramic view of Rome, by M. Petagna, is a great achievement in panoramic photography. There are seven impressions from 15 by 12 plates, all carefully joined, and of equal tone. The point of view is "Tasso's Oak," and the panorama gives us an excellent idea of Rome at the present day. The British part of the Photographic Exhibition in Dublin might be very properly denominated an enlargement of the Society's exhibition now open in Conduit Street, London. Nearly all the principal exhibitors there have sent duplicates of their chief works to the Dublin Exhibition. There is Robinson's beautiful picture of "Brenda," his "May Gatherers," "Sunshine," "Autumn," "Somebody Coming," "Bringing home the May," &c., all old and familiar pictures, every one of which we have seen before. Robinson himself in his study--a beautiful piece of photography, even to his black velvet coat. Blanchard also repeats his "Zealot," and other subjects, and sends a frame full of his exquisite stereographs. England also sends some of his charming stereoscopic pictures of Switzerland and Savoy. Bedford's contribution is much the same as his pictures in the London exhibition. Among them are his lovely Warwickshire pictures. Wet-plate photography is well represented, both in landscape, portraiture, and composition. Among the latter, Rejlander is most prominent. One frame containing some pictures showing the "expression" of the hands, illustrates Rejlander's artistic knowledge and ability more than many of his other pictures. None but a thoughtful and accomplished artist could have disposed of those members in such a skilful manner. His pictures of "Grief," "The Mote," "The Wayfarer," "'Tis Light within--Dark without," and his "Home, Sweet Home," reveal exquisite feeling in his treatment of such subjects. Thurston Thompson also exhibits some of his fine reproductions of Turner. There is "Crossing the Brook," and "Childe Harold's Pilgrimage;" but a much larger collection of these beautiful copies of Turner's pictures are now on view at Marion's, in Soho Square. Dry plate photography is exemplified in all its phases, from the oldest form of albumen alone, to the latest modifications with collodion, collodio-albumen, Fothergill, tannin, malt, &c. The most prominent and largest contributor to this department is Mr. Mudd. In addition to the duplicates in the London Exhibition, he sends a few others, the most remarkable of which is a large view of "Borrowdale," a noble picture, exquisitely treated, showing masses of light and shade and pleasing composition which stamp it at once as a work of art. Mr. G. S. Penny exhibits some very fine examples of the tannin and malt process. They are soft and delicate, and possess sufficient force to give powerful contrasts when necessary. Mr. Bull's tannin and malt pictures are also very good; his "Menai Bridge" particularly so.