Walker (C. V., F.R.S ), Death of, 228 Wallace (A. R.): Difficult Cases of Mimicry, 481; on the Value Ward (H. Marshall), on the Genus Meliola, 234 Wilson (A. S.), Potato Disease, 523 Wind, Increase in Velocity of, with Altitude, E. D. Archibald, Winlock (W. C.), t e Comet, 128 "Winners in Life's Race," Arabella Buckley, 51 Winter (Karl), Death of, 229 Wire Guns, James A. Longridge, II, 35, 53 Wissmann and Pogge's African Expedition, 92, 341, 401 Wolf on Methods employed in Astronomical Physics, 372 Ward (Rowland), the Sportsman's Handbook to Practical Col- Worthington (A. M.), the Magnetic Storm and Aurora, 85; Warmbrunn, Fulgurite found near, 540 Wartmann's Rheolyzer, E. von Fleische, 127 Warwick Museum, 539 Washing on Observatory, U.S., 300 Waste Paper in China, 588 Watch and Clockmaker's Handbook F. J. Britten, H. Dent Water, Sounds produced by Outflow of, Signor Martini, 183 Waterspouts on Land: James Hosack, 79; J. G. 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Mr. JAMES WHITE, 241, Sauchiehall Street, Glasgow, is now prepared to supply Galvanometers, constructed in accordance with Sir William Thomson's Patent, Dec. 1881. These instruments are Portable Galvanometers of two classes-one designed for measuring Electric Currents and the other for measuring Differences of Electric Potential. The Current Galvanometer measures Currents of from o'or of an ampère to 100 ampères. Galvanometers specially constructed to measure currents of ampère to 500 ampères and upwards. The Potential Galvanometer measures differences of Electric Potential of from o'r of a volt to 200 volts. PRICES.-Potential Galvanometer, with Controlling Magnets, Flexible Electrodes, &c., £20. Current Galvanometer, do. do., £15. S [All Rights are Reserved. A PLEA FOR THE RAIN-BAND. Now ready, a New Edition of this Celebrated Pamphlet, BY J. RAND CAPRON ESQ., F.R.A.S. With TWO PLATES by the Author. PRICE 4d. SENT FREE FOR FOUR STAMPS BY JOHN BROWNING, 63, STRAND, LONDON, W.C. 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The earlier Lectures will have reference to units of weight and measure, to the calculations necessitated by Chemical Operations, and to the nature and laws both of the Chemical Process and its results, as illustrated in Chemical Technology. Fee for the Course, One Guinea. Subsidiary Course.-A subsequent Course of Thirty Lectures will be delivered on Mondays, Tuesdays, and Wednesdays, at 10 a.m. These Lectures are more particularly intended for Dyers, Colour Manufacturers, Brewers and Distillers, Tar Rectifiers Drysalters, and others interested in a knowledge of Technical ORGANIC Chemistry. Fee for the Course, Two Guineas. Evening Courses.-Special Evening Course of Twenty-five Lectures on each of the following subjects:-Bleaching, Dyeing and Printing, by Prof. Mills; Iron and Steel Manufacture, and Fuel, by Mr. J. Snodgrass, Senior Assistant, are now in progress. These Lectures will qualify for the May Examinations of the City and Guilds of London Institute. 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MOORE, C.A., Secretary. Glasgow, 128, Hope Street, 26th October, 1882. NORMAL SCHOOL OF SCIENCE AND ROYAL SCHOOL OF MINES. Mr. WARINGTON W. SMYTH, F.R.S., Professor of Mining, will deliver a Course of about 60 Lectures at the Geological Museum, Jermyn Street, on Mondays, Wednesdays, Thursdays, and Fridays at 3.30 p.m. Fee for the Course £4. The first Lecture will be on Monday, NOVEMBER 6. Instruction in Mining, Surveying, Plan-drawing, &c., will be given on every day, beginning on Monday, 13th NOVEMBER, at 10 a.m. Fee for the whole Course £12. Apply to the REGISTRAR, Normal School of Science, South Kensington. LIVING SPECIMENS FOR THE MICROSCOPE. THOMAS BOLTON, NATURALISTS' and MICROSCOPISTS' STUDIO, 57, NEWHALL STREET, BIRMINGHAM. T. B. has last week sent to his subscribers the Trachelius ovum, with sketch and description. He has also sent out Lucernaria auricula, Lophopus crystallinus, Palludicella Ehrenbergi, Stephanoceros Eichornii, Melicerta ringens, Cephalosiphon limnias, Vorticella, Hydra, Amoeba, Nitella, &c. Weekly Announcements will be made in this place of Organisms T. B. is supplying. Specimen Tube, One Shilling, post-free. Twenty-six Tubes in course of Six Months for Subscription of £1 15. or Twelve Tubes for 10s. 6d. Portfolio of Drawings, Eight Parts, 1s. each. MICRO-PETROLOGY. A large series of Rock Sections, comprising Anamesite, Aplite, Basalt, Diabase, Diorite, Dolerite, Elvans, Gabbro, Gaiss, Granite, Granulite, Lava, Liparite, Napoleonite, Nephelenite, Obsidian, Perthite, Pikrite, Pitchstone, Porphyry, Phonolite, Quartzite, Rhyolite, Schorlite, Syenite, Tachylite, Trachyte, &c., 15. Ed. and 25. each. Sections of Sedimentary Rocks, showing Foraminifera, Sponge Structure, Corals, Shells, Xanthidiæ, &c. THOMAS D. RUSSELL, 48, ESSEX STREET, STRAND, W.C. GEOLOGY AND MINERALOGY. Specimens, Collections, Cabinets, Hammers, Satchels, and every necessary for the Study, Preservation, and Display of Specimens in Museums, &c. STUDENTS' COLLECTIONS—SPECIAL. New Lists of Collections, Cabinets, Books, Sections of Rocks and Minerals for Microscope free on application of JAMES R. GREGORY, Extensive Geological Stores, 88, CHARLOTTE STREET, FITZROY SQUARE, LONDON. MINERALOGY AND GEOLOGY. Mr. HENSON has just received a most beautiful and UNIQUE SPECIMEN OF CLEAR APATITE. Hammers, Chisels, and Hammer Straps. PRIVATE LESSONS AND EVENING CLASSES. Blowpipe Cases and Apparatus. SAMUEL HENSON, 277, STRAND, LONDON, Opposite Norfolk Street. ELECTRICAL AND SCIENTIFIC APPARATUS.-New Edition of our complete and comprehensive Descriptive Catalogue of Electric Appliances, Instruments, and Materials, fully Illustrated. 72 pages, post free, Four Stamps. Special Terms to Science Teachers and Schools.-H. and E. J. DALE, Manufacturing Electricians, 4, Little Britain, London, E. C. 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