CCIV 



NATURE 



{April 24, 1879 



Just published, with Illustrations, fcap. 8vo, cloth, 45. 



A MANUAL of ORGANIC CHEMISTRY, 



PRACTICAL and THEORETICAL, for Colleges and Schools, 

 Medical and Civil Service Examinations, and for Elementary, Ad- 

 vanced and Honours Students at the Classes of the Science and Art 

 Department, South Kensington. By HUGH CLEMENTS. 

 London: BLACKIE & SON, 49 and 50, Old Bailey. 

 Glasgow, Edinburgh, and Dublin. 



BARCLAY & SON, 



138, REGENT STREET, LONDON. 



To Her Majesty and H.R.H. the Prince */ Wales. 



DUPLEX LAMPS. 

 MODERATOR LAMPS. 



READING LAMPS. 



MICROSCOPE LAMPS. 



BEST COLZA OIL. 



A I KEROSINE OIL. 



WAX, SPERM, 



AND 



PARAFFINE CANDLES. 



ILLUSTRATED CATALOGUES POST FREE. 



O. TI8LEY & Co. 



OPTICIANS, *' 

 X72, BROMPTON ROAD, S.W. 



(Close to South Kensington Museum). 



THE PHONEIDOSCOPE 



An Instrtiment for Observing the Colour-Figures of Liquid Films under the 

 action of Sonorous Vibrations. 



Being a visible demonstration of the Vibratory and Molecular Motion of a 

 Telephone Plate. 



The PHONEIDOSCOPE, with 3 Discs, Bottle of Solution, Descriptive 

 Pamphlet, &c., in Cardboard Box, lar. (>d. 



mani;factured and sold wholesale and retail by 



S. C. TISLEY & CO., 172, BROMPTON ROAD, LONDON, S.W. 



TELEPHONIC ELECTRICITY. All Materials supplied for experi- 

 mental purposes. 



Price Lists of Electrical and Acoustic Apparatus, with Dtawings and 

 Descrijititn of tlu Harmenazrafh, Post Free, 2d. 



MICROSCOPES, OBJECTIVES, &c. 



CENTENNIAL EXHIBITION. PHILADELPHIA. U.S.A. 



The Medal and Highest Award has been given for Design, 

 Construction, Optical Excellence, and Moderation in Price, to 



HENRY CBOUCH, 



66, BARBICAN, LONDON, E.C. 



Fully Illustrated Catalogue and full Instmctions by Post, 6 Stamps. 

 Mailed abroad free. 



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. 



FOR CLASS 



DEMON- 



APPARATUS 



STRATKJN and for SCIENCE SCHOOLS. 



ELECTRIC LIGHT APPARATUS. 

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MACHINES and LAMPS for Hire and Purchase. 



LARGE ASSORTMENTofRUHMKORFF 



COILS and VACUUM TUBES. 



PROFESSOR HUGHES' MICROPHONE. 

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BELLS, WIRE, &c., for Fixing. 



PROF. S. P. THOMPSON'S LANTERN 



SLIDE GALVANOMETER, aoj. 



EDISON'S ELECTRIC PEN £8 8s. 



ELECTRIC and MAGNETIC APPA- 

 RATUS of all Descriptions. 



New Illustrated Catalogue of (>o pages post free 6 stamps. 



Orders over £,1 carriage paid to any part of the United Kingdom. 



NO\A^ READY, 



SECOND EDITION, 



GRIFFIN'S 



CHEMICAL HANDICRAFT. 



PRICE 4^. 7^. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS: 



ILLUSTRATED, CLASSIFIED, DESCRIPTIVE. 



Demy 8vo, 480 pp., Illustrated witli i,6oo Woodcuts. 

 Most Complete and Cheapest List of Apparatus. 



JOHN J. GRIFFIN and SONS, 22, GARRICK STREET, 

 LONDON, W.C. 



W. LADD & CO., 



Scientific Instrament Manufactursrs 



{fiy Appointtntnt to the Royal Institution of Great Britain), 



II & 12, BEAK STREET, REGENT STREET, W. 



BYRNE'S PATENT COMPOUND PLATE PNEU- 

 MATIC BATTERY for Cautery and general purposes. 



EDMUNDS' PHONOSCOPE for raaking Vocal Vibra- 

 tions visible in a Vacuum Tube. 



HUGHES' MICROPHONE. 



TELEPHONIC APPARATUS, &c. 



LADD'S IMPROVED SELF-CHARGING HOLTZ 

 ELECTRICAL MACHINE, with 4 to 12 Plates, in- 

 closed in a Mahogany and Glass Case. This instrument is 

 immediately available in any condition of the atmosphere. 

 Philosophical Apparatus of every Description. 



Illustrated Catalogue, Sixpence. 



DRAPER'S INK (DICHROIC). 



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 througliout 



Ireland. 

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

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



Is cleanly to use, and not liable toBIot. | moment of writing. 



Can be obt^ned in London, through Messrs. Barclay & Sons, Earring- 

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. BEWLEV & DRAPER (Limited). Dublin. 



