xxxviu 



NATURE 



{Dec. 5, 1S78 



W. LADD & CO., 



{Scientific Instrument Manolacturers 



(By Appoimtnent to tht Rsyal Imtitution 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 making Vocal Vibra- 

 tions visible in a Vacuum Tube. 



HUGHES' MICROPHONE. 



TELEPHONIC APPARATUS, &c. 



JLADD'S IMPROVED SELF-CHARGINQ 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. 



THE MINIATURE MIGR08C0PE LAMP 



(REGISTERED) 

 PRICE i4f. PORTABLE TIN CASE FOR DITTO, 2*. ta. 



JAMES HOW & Co., 

 SCIENTIFIC INSTRUMENT MAKERS, 



S, ST. BRIDE ST. {late 2, Foster Lane), LONDON. 



HOLIOWAYS OINTMENT 



A CERTAIN 

 REMEDY 



For BAD BEEASTS, OLD WOUNDS, and SOSES. If 

 effectually rubbed on the Neck and Chest, it cures SOEE 

 THROATS, BRONCHITIS, COUGHS and COLDS; and for 

 GOUT, BHEUHATISK, and all Skin Diseases it is oneqLualled. 



. EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Manufacturer, 

 3. BEDFORD COURT, COVENT GARDEN, LONDON. 



APPARATUS FOR CLASS Demon- 

 stration and for SCIENCE SCHOOLS. 



ELECTRIC LIGHT APPARATUS. 

 SIEMEN'S DYNAMO MACHINE for 



Hire. 



LARGE ASSORTMENT of RUHMKORFF 



COILS and VACUUM TUBES. 



PROFESSOR HUGHES' MICROPHONE. 

 COOKE'S TELEPHONE ALARUM. 

 ELECTRIC BELLS and INDICATORS. 

 TELEPHONES and TELEPHONE CALL 



BELLS, WIRE, &c., for Fixing. 



ELECTRO - METALLURGICAL CABI- 



N ETS, from £\ to £ii. 



PROF. S. P. THOMPSON'S LANTERN 



SLIDE GALVANOMETER, atw. 



EDISON'S ELECTRIC PEN £8 8s. 

 ELECTRIC and MAGNETIC APPA- 

 RATUS or all Descriptions. 

 New Illustrated Catalogue 0/ 60 pages post free 6 stamps. 

 Orders over £i carriage paid to .any part of the United Kingdoia. 



S. 0. TISLEY* Co., 



17 2, 



OPTICIANS. 

 BROMPTON ROAD, 



(Close to South Kensington Museum). 



s.w. 



THE PHONEIDOSCOPE. 



An Instrument for Observing the Colour-Fig^ires of Liquid Films under tha 



action of Sonorous Vibrations. 



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



Telephone Plate. 



The PHONEIDOSCOPE, with 3 DUcs, Bottle of SoluUon, Descriptive 



Pamphlet, &c., im Card^xnrd Box, lor. 64. 



MAMUFACTURKB AMD SOLD WHOLKSALK ANB RETAIL BV 



S. C. TISLEY & CO., i7», BROMPTON ROAD, LONDON. S.W. 

 TELEPHONIC ELECTRICITY. All Materials suppUed for experi- 

 mental purposes. 

 Price Littt »f Electrical and Acjustic Apparatus, nrntk Drawings and 

 Description of the Harmenosrraph, Post Free, 2d. 



JUST PUBLISHED. 



GEGENBAUR'S COMPARATIVE ANATOMY. 



A Translation by F. JEFFREY BELL, B.A. 



REVISED WITH PREFACE BY PROF. E. RAY LANKESTER, F.R.S. 



With numerous Illustrations. Medium 8vo. 21s. 



MACMILLAN & CO., LONDON. 



NOW READY. 



COAL, ITS HISTORY AND ITS USES. 



By Professors GREEN, MIALL, THORPE, RUCKER, and MARSHALL, 

 Of the Yorkshire College, Leeds. 

 With numerous Illustrations. 8vo. 12s. 6d. 



MACMILLAN & CO., LONDON. 



JUST PUBLISHED. 



SPORT AND WORK ON THE NEPAUL FRONTIER; 



(?/?, TWELVE YEARS' SPORTING REMINISCENCES OF AN INDIGO PLANTER. 



By "MAORI." 



With Illustrations. 8vo. Price 14J. 

 MACMILLAN & CO., LONDON. 



