June 12, 1879] 



NATURE 



Iv 



W. L A D D & CO., 



Scientific Instrament Manofactarers 



(5y Appointnunt to tk4 Royal Institiitton 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. 



LADD'S IMPROVED SELF CHARGING HOLTZ 

 ELECTRICAL MACHINE, with 4 to 12 Plates, in- 

 closed in a Mahogany and Glass Case. This instrament is 

 immediately available in any condition of the atmosphere. 

 Philosophical Apparatus of every Description. 



llhatraUd Caiah^tu, Sixpenct, 



THE MINIATURE MICROSCOPE LAMP 



(REGISTERED) 

 PRICE u'- PORTABLE TIN CASE FOR DITTO, ar. 6d. 



JAMES HOW & Co., 



SCIENTIFIC INSTRUMENT MAKERS, 



5, ST. BRIDE ST. (latt a, Foster Lane), LONDON. 



C. TISLEY.SC0., 



OPTICIANS. 

 173, BROMPTON ROAD, S.W. 



(Close to South Kensington Museum). 



THE PHONEIDOSCOPE 



An Instrument 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, loj. 6d. 



MANUFACTUHED 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 Dtawin^s and 

 Description of the Hartnonos^aph^ Post Free, %d. 



HORNE'S POMFEIAN DECORATIONS. 

 ROBERT HORNE, 



HOUSE DECORATOR and PAPER-HANGING 



MANUFACTURER, 



41, GRACECHURCH STREET, LONDON, E.G. 



By Special Appotntment to His Majesty the King of Italy. 



GOLD MEDAL, 

 PARIS EXHIBITION. 



In Packets and Tins. Pure 



Cocoa (inly, with the super- 



flujuft oil extracted. 



"If properly prepared, there is no nicer ^^•^m^^mm^ m ^^v^V* 

 or more wholesome preparation of L^ jy ^g [3 y\ W ^ I 

 cocoa."— ^ocrf. Water, and Air, t.#X I llA^^^ I 

 edited by Dr. Hasiall. 



FRY'S 



COCOA 



J. S. FRY & SONS, Bristol and London, 



BARCLAY & SON, 



138, REGENT STREET, LONDON. 

 To Her Majesty and H.R.H. the Prince *f 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, 

 ENGRAVINGS AND ELECTROTYPES 



FOR SALE, at prices ranging from is. to loj., in good condition, ready for 

 printing. Small, medium size, and large engravings, comprising a great 

 variety of subjects, suitable for Publishers, Advertisers, and Amateurs. 

 Specimen of any subject required sent post free on application. 



FACSIMILE OF SIGNATURE for sj. An exact copy of any name 

 guaranteed. These signatures being engraved in bold relief, are useful for 

 Stampine Books, Circulars, and Documents, or Marking Linen, and made 

 type-high for ordinary Letterpress Printing. 



Sent post free to any address on receipt of 36 stamps. 



75, FLEET STREET, LONDON, E.G. 

 ARTISTIC— To Ladies and Gentlemen with 



some leisure time, desiring to supplement their incomes, an opportunity 

 is offered of acquiring the ART of DRAWING and ENGRAVING 

 on WOOD in a thoroughly satisfactory aid perfect style. The temu 

 are moderate, and the hours can be made to suit the convenience of 

 pupils. Persons residing in the country can receive full instructio* by 

 correspondence. For further particulars call or address Mr. J. FkaN£- 

 LiM Nash, Artist and Engraver. 75, Fleet Street, London, E.C. 



OLDRIDGE'S BALM OF COLUMBIA 



Prevents Baldness and the Hair turning Grey, and forms the 



Basis of a Magnificent Head of Hair, Strengthens Weak Hair, 



and causes the 



WHISKERS AND MOUSTACHIOS to GROW FREELY. 



Sold everywhere, 3j. ()d., 6s. 6d., and lis., 



Wholesale and Retail. 



M, WELLINGTON STREET, STRAND, LONDON, W.C. 

 Established Sixty Ykars. 



HOLLOWAYS PIUS 



THIS 

 MEDICINE 



I« a Certain Cur» for all Disorders of the LIVKE, STOMACH 

 AND BOWELS. A Great PtJSIFIKE of the BLOOD; • 

 Powerful Invigorator of the Byattem, in cases of WEAKNESB 

 AND DEBILITY, and U nneiinalled In Female Complainta. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scifntilic opinion livenu to GENUINENESS, PURITY 

 and VALUE.-'Bkyce VVkight, «<>, GrsulliuMU SlrMt,.Lo«dM, 



