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W. W^ATSON & SON'S 

 NEW MIOEOSCOPE STAND (PATENTED), 



The most perfect Instrument for the employment of light at great 

 angle of obliquity ever introduced. 



W. & S.'s PATENT MECHANICAL STAGE 



Is graduated to degrees — ^Rotates concentric, and will revolve completely round, with any 

 instrument — has mechanical movements in vertical, horizontal, and oblique directions, 

 and is the thinnest and most perfect mechanical stage ever introduced. 



See description in the Royal Microscopical Journal, April and June, 1881. 



Ittttstrated Catalogue of above, and all descriptions of Microscopes arid Apparatus, 



post free 2d. 



W. WATSON & SONS, 313, High Holborn, London, W.O. 



TO 3VII CROSOOP ISTS. 



PREPAHATIONS OF FRESH WATER ALGiE, j 



Including Desmidie^, DiATOMACEiE, and OSdogonie^ ; also Fungi, Mosses, &c., showing: 



well their Structural Development and Mode of Reproduction, 15«. per doz. slides. 



A few very good sets of Opaque Lichens, suitable for low powers with the Binocular. 



These will have especial interest to the Student, showing the true character of the. 

 thallus, its colour and mode of growth, and as type specimens from which Herbaria may 

 be named will be invaluable. 



Apply: W. JOSHUA, F.L.S., CIRENCESTER. 



New and Second-hand Microscopes, Objectives, and Accessories. 



A Large Assortment by Eoss, Beck, Collins, Swift, and other first-class Makers, on Sale, 



at a Great Redtjctiok in Price. •; 



MICEOSCOPICAL OBJECTS in great variety. Sp&ialit€. Phtsiglogical and Pathological Tissues, j 



A choice variety of prepared Physiological Sections ready for Mounting. 



PHOTOGRAPHIC LENSES, CAMERAS, and APPARATUS, by Ross, Dallmeter, and all other esteeme* 



Makers. Largest, Cheapest, and Best Stock in London. New Cataxogues Post Free. 



HUNTER & SANDS, 20, CRANBOURN STREET, LONDON. 



LIVING SPECIMENS FOR THE MICROSCOPE. 



THOMAS BOLTON, 57, Newhall Street, Bipmingham. 

 SPECIMEN TUBE, ONE SHILLING. 



A Series of Twekty-six Tdbes in course of Six Months (or as required) for a Subscbiption, 

 in advance, of £1 is. 



Portfolio of Drawing's, Eight Parts, One Shilling each. 



Bints on the Preservation of Living Objects, and their Examination under the Microscope, 3d. 



UNMOUNTED OBJECTS FOR THE MICROSCOPE, 



PREPARED FOE MOaNTING, WITH INSTRUCTIONS, 



Will be ready immediately — 



Series D*— 24 Australian Zoophytes. Series E*— 12 Palates of Mollusca. 



Series F* — 24 Mosses and Hepatics. 



PRICE 2s. EACH SEEIES, POST-FREE, 2s. Id. 



Brown Cement, the best for Microscopic Work, post-free, is. 3d. 



Every requisite for Microscopic work. 



EDWARD WARD, 29, BURLINGTON STREET, OXFORD ROAD, MANCHESTER. 



A Large Series of Rock Sections, comprising Anamesite, Aplite, Basalt, Diabase^ 



Diorite, Dolerite, Elvans, Gabbro, Gneiss, Granite, Granvilite, Lava, 



Liparite, Napoleonite, NeppelLrite, Obsidian, Pikrite, Porphyry, Phonolite, 



Quartzite, Rhyolite, Syenite, Tachylite, &c., Is. 6d. and 2s. each. 



Sections of Organic Rocks, showing Foraminifera, Sponge Structure, Corals, Shells, &a 



THOMAS D. RUSSELL, 48, Essex Street, Strand, W.C 



