A Manual Of Photography

1852.] GRIFFIN’S SCIENTIFIC CIRCULAR. 111 MINERALOGY AND GEOLOGY. In addition to the CABINETS of ROCKS, MINERALS, and FOSSILS, described in former parts of the Scientific Circular (see pages, 9, 11, 14, 70, 71, 72), we beg to announce that we have now on sale the following important Collections :— 2806. The HEIDELBERG SUBSCRIPTION COLLECTION of ROCKS and FOSSILS, prepared under the superintendence of Professors LEON- HARD and BRONN. Seven Hundred Specimens. The size of these specimens is 9 square inches, each specimen is accompanied by a printed descriptive ticket in English, French, and German, and there is a printed Catalogue of the whole. Great labour and expense have been incurred to ensure for this Geological Collection the character of unusual completeness and usefulness. It contains not only a collection of well-characterised specimens of all the Rocks and Fossils of most frequent occurrence, but also specimens of great rareness and excellence, including complete suites from the Paris Basin, the Vienna Basin, the Tyrol, from Sicily, North America, Brazil, &c. The names of the specimens being given on the authority of those eminent Geologists, Professors Leonhard and Bronn, may be implicitly relied on, which gives a high scientific character to this Collection. Messrs. JOHN J. Griffin & Co. having been appointed by the Heidelberg Mineral Institution to be their Sole Agents in England, are enabled to offer this Magnificent Geological Collection of Seven Hundred Specimens for the low price of 20 guineas, delivered in London free of expense. MINERALS.—Several fine Collections of 200, 300, 400, and 500 Specimens, prepared by the Heidelberg Mineral Institution, for sale at moderate prices. ELEMENTARY COLLECTIONS IN CABINETS. The following collections are recommended to those who are commencing the study of Mineralogy and Geology. They are all contained in handsome polished Mahogany Cabinets, opening with doors, and containing mahogany drawers. Every specimen is placed in a separate pasteboard tray, covered with enamelled green paper. Size of Specimens about three square inches. 2807. Cabinet of 100 simple Minerals, 21. 12s. 6^. 2808. Cabinet of 100 Rocks and Fossils, 2l. 12s. 6^. 2809. Cabinet of 150 simple Minerals, 4L 4s. 2810. Cabinet of 150 Rocks and Fossils, 4L 4s. 2811. Cabinet of 200 Minerals, Rocks, and Fossils, 5l. 5s. 2812. ELEMENTS of MINERALOGY and GEOLOGY. By PROFESSOR SCHOEDLER. Edited by H. Medlock, F.C.S., Senior Assistant in the Royal College of Chemistry, London. Illustrated by 128 woodcuts, 2s. 6^. cloth. 2813. The same work, interleaved with ruled paper,for writing Notes, or Catalogue of Specimens, bound in cloth, 5s. MEDICAL CHEMISTRY. 2814 CABINET OF APPARATUS AND MATERIALS FOR THE ANALYSIS OF URINARY DEPOSITS, according to Dr. GOLDING BIRD. See his work entitled “ Urinary Deposits, their Diagnosis, Pathology, and Thera- peutical Indications. By GOLDING Bird, A.M., M.D., F.R.S., F.L.S.,&c. Third Edition, 8vo. London, 1851.” In a polished mahogany divided Cabinet, with lock and key, 2l. 12s. 6d.