Monthly Microscopical Journal, Jan. 1, 1870. MICROSCOPIC OBJECTS. Classified Catalogue Post Free. Specimens of the highest attainable perfection. New and Rare Objects. Möller's Typen Plattes. Nobert's Lines. Microscopes, and all Materials and Instruments for Mounting. EDMUND WHEELER, 48m, Tollington Road, Holloway, London, N. J. B. DANCER, OPTICIAN, MANCHESTER. THE NEW CHEAP MICROSCOPE, Adapted for the use of everybody, supplied with a dividing Objective, with Standard Screw, of really good performance (own make), giving powers, with Draw Tube, from 50 to 250 diameters. Micrometer Head to fine motion, which enables the observer to measure the thickness of objects to both of an inch. Workmanship good and substantial, price 63s. Stand, without Objective, 55s. Cheap and efficient Polarizing Apparatus, Micrometer for Eye-piece, Erect Eye-piece, and Condenser supplied to this Instrument. 36 NEW OBJECTS FOR THE MICROSCOPE. 12 Polarizing, 12 various, and 12 Microphotographs, in boxes of 12 each, at 10s. 6d. MICROSCOPES, TELESCOPES OF ALL DESCRIPTIONS. Catalogues on application, Two Stamps. FOSSILS FROM OUR CRAGS. ELEMENTARY COLLECTIONS OF SHELLS, ETC. FOR THE SCHOOL Mounted and Labelled by a Clergyman. From 10s. 6d. upwards. THE MONTHLY MICROSCOPICAL JOURNAL,' 192, Piccadilly, W. Just published, price 12s. 6d. FLORA OF MIDDLESEX: A TOPOGRAPHICAL AND HISTORICAL ACCOUNT OF THE PLANTS FOUND IN THE COUNTY; WITH SKETCHES OF ITS PHYSICAL GEOGRAPHY AND CLIMATE, AND OF THE PROGRESS OF MIDDLESEX BOTANY DURING THE LAST THREE CENTURIES. By HENRY TRIMEN, M.B. (LOND.), F.L.S., Botanical Department, British Museum, and Lecturer on Botany; St. Mary's Hospital; and WILLIAM T. THISELTON DYER, B.A., late Junior Student, Christ Church, Oxford, Professor of Natural History, Royal Agricultural College, Cirencester. With a Aap of Botanical Districts. The object of this book is to give a complete and accurate Catalogue of the Plants which have at any time been recorded to grow in Middlesex, either as natives or in a more or less completely naturalized state, to indicate the special localities where they have been found, and to trace the history of their discovery. The existence of many of these is attested only by records in scarce or little-known books, or by the original specimens preserved in old collections. Fcap. 8vo, cloth, with Illustrations on Stone and Wood, price 28. 6d. HALF-HOURS WITH THE TELESCOPE, Being a Popular Guide to the Use of the Telescope as a means of Amusement and Instruction Adapted to inexpensive Instruments. By R. A. PROCTOR, B.A., F.R.A.S. Demy 4to, cloth, price 58. HALF-HOURS WITH THE STARS. A Plain and Easy Guide to the Knowledge of the Constellations. Showing in Twelve Maps the position of the principal Star-Groups night after night throughout the year. With Introduction, and a separate explanation of each Map. True for every year. By RICHARD A. PROCTOR, B.A., F.R.A.S., Author of Half-hours with the Telescope.' London: ROBERT HARDWICKE, 192, PICCADILLY, W. 1910 MICROSCOPE OBJECTIVES. REVISED PRICE LIST. Ar the suggestion of Drs. Carpenter, Michael Foster, and other eminent Microscopists, Mr. HENRY CROUCH has, during the last two years, carried out a series of experiments, with the view of producing MICROSCOPE OBJECTIVES of the highest class, at a cost that will bring them within the reach of all Students of Natural History, &c., Professional or Amateur. As the result, he is enabled to offer them at the following reduced prices : From the in. to the in. this series is fitted with a new Adjustment for covered and uncovered. A new Illustrated Catalogue of Microscopes, &c., will be ready in a few days, and forwarded on receipt of Four Stamps. Post-office Orders to be made payable at Lombard Street Office. HENRY CROUCH, 51, LONDON WALL, LONDON, E.C. THREE DOORS FROM LATE ADDRESS. a |