( 16 ) 

 W. V/ATSON & SON'S 



NEW mOROSCOPE STAND (PATENTED), 



Th.e most perfect Instrument for the emplojrment of light at great 

 angle of obliqmty ever introduced. 



W. & S.'s PATENT MECHANICAIi STAGE 



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

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

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



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



Illustrated Catalogue of above, and all descriptions of Microscopes and Apparatus, 



post free 2d. 



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

 TO MI CR-OSCOF ISTfe. 



PREPABATIONS OF FRESH WATER ALGiE, 



Including DzsMiDiEiE, DiATOiiACEiE, and CEdogoxie^ ; eJso Fcxgi, Mosses, &c., showing 



■well their Structural Development and Mode of Reproduction, 158. per doz. slides. 



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



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

 thallu^, its colour and mode of growth, and as type specimens frtsn 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, CoLLrss, Swift, and other flrst-clasa Makers, on Sale, 



at a Great Reduction in Price. 



MICROSCOPICAL OBJECTS in great variety. Spdcialit^. Phtsiologicai, and Pathological Tissues. 



A choice variety of prepared Physiological Sections ready for Mounting. 



PHOTOGRAPHIC LENSES, CAMERAS, and APPARATUS, by Ross. Dallmeter, and all other esteemed 



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



HUNTER & SANDS, 20, CRANBOURN STREET, LONDON. 



LIVING SPECIMENS FOR THE MICROSCOPE. 



THOMAS BOLTON, 67, Newhall Street, Birmingham. 

 SPECIMEN TUBE, ONE SHILLING. 



A Series of Twentt-six Tubes in course of Six Months (or as required) for a Scbscbiption, 

 in advance, of £1 Is. 



Portfolio of Drawings, Eigrht Parts, One Shilling: each.. 

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



UNMOUNTED OBJECTS FOR THE MICROSCOPE. 



PREPARED FOR MOUNTING, WITH INSTRUCTIONS, 



Will be ready immediately — 



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



Series F* — 24 Mosses and Hepatics. 



PRICE 2s. EACH SERIE.S, POST-FREE, 2s. Id. 



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



Every requisite for Microscopic icorfc. 



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



A Large Series of Eock Sections, comprising Anamesite, Aplite, Basalt, Diabase, 



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



Liparite, Napoleonite, Neppeltrite, Obsidian, Pikrite, Porphyry, Phonolite, 



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



Sections of Organic Eocks, showing Foraminifera, Sponge Structure, Corals, Shells, &c. 



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



