clxxviii 



NATURE 



{SepL 25, 1879 



CHEMICAL & PHYSICAL APPARATUS 



BOTTLES, PURE CHEMICALS, 



And every requirement for Science Classes, Private Study, or Business 

 Purposes 



Illustrated Priced Catalogues post free for six stamps. 



Carriage allowed to any station in England or Wales, on orders of 40J, 

 value and upwards. 



MOTTERSHEAD AND CO. 



7, EXCHANGE STREET. & 10, HALF MOON STREET, 

 MANCHESTER. 



DRAPER'S INK (DICHROICX 



THE NEW BLACK INK 



DIFFERING FROM ANYTHING ELSE EVER PRODUCED. 



Writing becomes a pleasure when this Ink is used. It has been adopted 

 by the principal Banks, Public Offices, and Railway Companies throughout 



Ireland. 

 It writes almost instantly Full Black. 1 Flows easily from the Pen. 

 Does not corrode Steel Pens. Blotting-paper may be applied at the 



Is cleanly to me, and not liable to Blot. | moment of writing. 



Can be obtained in London, through Messrs. Barclay & Sons, Farring 

 don Street; W. Edwards, Old Change; F. Newbery & Sons, Newgate 

 Street; Wm. Mather, London and Manchester; J. Austin &; Co., Duke 

 Street, Liverpool; and Stacy & Cook, Paternoster Row; and to be had of 

 all Stationers. 



BEWLEY & DRAPER (Limited), Dublin. 



MINERALS, ROCKS, AND FOSSILS. 



COLLECTIONS IN CABINETS. 



Two Hundred Specimens, a,os. ; 150 do., 301. ; 100 do., 20J. ; 50 do., lof. 

 Size of Specimens, 2 square inches. Naming and Localities guaranteed. 



Superior Cabinets fitted with Card-Trays and Catalogue included. 



" 1 he Popular Scientific Pocket Cabinet Series *' comprises 9 Cabinets and 

 224 Specimens, is. 6d. each Cabinet, free delivery, \d. (See Nature, 

 March 13, No. 489, page 447.) 



The Collector's Field Apparatus complete, 21*. Hammer-holder and 

 Waist-strap, price zs. Collecting-bag (figured and described), price ^$. 



THOMAS J. DOWNING, Geologist, &c., 



38, WHISKIN STREET, LONDON, E.C. 



Catalogue, Lists, and " Quarterly Circular " free on receipt of 2d. postage. 



THE "HANSA," 



Published since 1864, in Hamburg, is the only independent professional 

 paper in Germany, dedicated exclusively to Maritime Objects. Essays, 

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THE BEST FARMER S' NEWSPAPER, 



THE CHAMBER OF 

 AGRICULTURE JOURNAL 



AND FARMERS* CHRONICLE, 



Edited by John Algernon Clarke, Secretary to tbe Central CHiamber 



of Agriculture, 

 Devotes special attention to the discussions and proceedings of the (Chamber 

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 intelligence of particulai value to the agnculiunst. 



The London Com, Seed, Hop, Cattle, and other Markets of Monday are 

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Published bv W. PICKERING, 21. Arundel Street, Strand, W.C, 



THE ENTOMOLOGIST'S MONTHLY 

 MAGAZINE. 



Price Sixpence, Monthly, 24 pages 8vo, with occasional Illustrationi. 



Conduaed by J, W. Douglas, R. McLachlan, F.R.S., E. C. Ryb, F.Z.S, 



and H. T. Stainton, F.R.S. 



This Magazine, commenced in 1864, contains standard articles and notes 



on all subjects connected with Entomology and especially on the Insects of 



the British Isles. 



Subscription — Six Shillings per Volume, post free. The volumes com- 

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Vols. i. toV (strongly bound in cloth) may be obtained by purchasers of 

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London :jruHN VAN VOfjRST, 1, Paternoster Row. 

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MINERALOGY AND GEOLOGY. 



A New List of Collections of Fossils, Minerals, and Rocks now ready, 

 including Special Collections to illustrate the various Text-books, la 

 Cabinets. List of Sections of Rocks for the Microscope. Blowpipe Appa- 

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JAMES R. GREGORY, 



MUSEUM OF GEOLOGV, 



88, CHARLOTTE STREET, FITZROY SQUARE. 



LABORATORY, 38, GRACECHURCH STREET, LONDON, E.C. 



A. ANTHONY NESBIT, F.C.S., 



WATER ANALYST, 



Performs every description of Water Analysis on moderate terms, K 



Properly cleansed bottles for the reception of samples sent to any part W 

 the Kingdom. 



EUDOLPH KOENIG, 



(DR. PHIL.) 

 MANUFACTURER OF 



ACOUSTICAL INSTRUMENTS.1 



TO ILLUSTRATE THE LAWS 



AND TO PRODUCE THE PHENOMENA OF SOUND. 



PARIS, 26, BUE DE POHTOISE. 



PRICE LISTS FREE. 



NEW ILLUSTRATED CATALOGUE of ELECTRIC 



SIGNALS, &c., with Instructions for Fixing. 150 Diagrams. Justout, 

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EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Manufacturer, 



3, BEDFORD COURT, COVENT GARDEN, LONDON 



STEAM WORKS, GRAY'S INN ROAD. 



Experiments in Electric Lighting carried out. 



Electrical Apparatus of all Descriptions for Lecture Purposes Loaned out, 



APPARATUS for CLASS DEMONSTRATION and for SCIUNCE 



SCHOOLS. 

 ELECTRIC LIGHT APPARATUS. 

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for Hire and Purchase. 

 LARGE ASSORTMENT of RUHMKORFF COILS and VACUUM 



TUBES. 

 PROFESSOR HUGHES' MICROPHONE. 

 ELECTRIC BELLS and INDICATORS. 

 TELEPHONES and TELEPHONE CALL BELLS, WIRE, Sfcc, for 



Fixing. 

 EDISON'S ELECTRIC PEN li is. 



ELECTRIC and MAGNETIC APPARATUS of all Descriptions. 

 Illustrated Catalogue Electrical Apparatus, Part i. Post free, 6 Stamps, 

 do do Electric Signals, Part 2. Post free, 6 Stamps. 



To be published early in October. 



STUDIES on FERMENTATION. 



The 



Diseases of Beer : their Causes and the Means of Preventing them. 

 By L. PASTEUR. A Translation of "Etudes sur la Biere,"* with 

 Notes, Illustrations, &c. By F. Faulkner and D. C. Robb, B.A. 

 8vo. 



MACMILLAN & CO.. LONDON. 



Extra fcap. Bvo, 3*. ^. 



METALS and their CHIEF INDUSTRIAL 



APPLICATIONS. By C. ALDER WRIGHT, D.Sc, Lecturer on 

 Chemistry in St. Mary's Hospital Medical School. With Illustrations. 



MACMILLAN & CO., London. 



HOLLOVWVYS PILLS 



THIS 



MEDICINE 



Is a Certain Cure for aU Disorders of the IIVEB, STOMACH 

 AND BOWELS. A Great PUEIFIEE of the BLOOD; a 

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 iND DEBILITY, and is uneaualUd in Female Complaints. 



