CCXVlll 



NATURE 



[Oct. 30, 1879 



ADVERTISING. 

 C. H. M A Y cSj, C O., 



GENERAL ADVERTISING OFFICES, 

 78, GRACECHURCH STREET, LONDON, E.C, 



(The only Address.) 

 ESTABLISHED 1846. 



Advertisements of every description received for insertion in all News- 

 papers, Magazines, Reviews, &c., at the same rates as at the offices of the 

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Estimates for General Advertising. Reduction for a series. 



Liberal terms to large advertisers. 



Advertisements are also received for all newspapers, which may be ad- 

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C. H. MAY & CO., having special communication with the leading news- 

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The Press Manual for 1879, containing a complete List of Newspapers 

 published in the United Kingdom. Post free, 6d. 



NOW READY, 

 SECOND EDITION, 



GRIFFIN'S 



CHEMICAL HANDICRAFT. 



PRICE 4*. 7d. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS; 



ILLUSTRATED, CLASSIFIED, DESCRIPTIVE. 



Demy 8vo, 480 pp.. Illustrated with 1,600 Woodcuts. 



Most Complete and Cheapest List of Apparatus. 



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

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^ C. T18LEY cfe Co. 



OPTICIANS, '' 

 XT 2, 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 

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MANUFACTURED AND SOLD WHOLESALE AND RETAIL BV 



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



TELEPHONIC ELECTRICITY. All Materials suppUed for experi- 

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Prici Lisix of Electrical and Acoustic Apparatus^ with Drawings and 

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NOTICE OF REMOVAL. 



JAMES HOW & CO., 



SCIENTIFIC INSTRUMENT MAKERS 



73, FAREINGDON ST., LONDON 



(Late of 5, St. Bride St., and 2, Foster Lane). 



HOW'S STUDENT'S MICROSCOPE. HOW'S MICROSCOPE LAMP. 



Rock Sections i.nd other Objects for the Microscope. 



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A CEBTAIN 

 REMEDY 



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FLETCHER'S SOLID FLAME 



TKAUE m,\rk. 



BURNER 



will with equal 

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 melt half a hun- 

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 lead in an iron 

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 will melt 6 lbs. 

 of lead or solder 

 in an iron ladle 

 in 7 minutes. 



Height, 5 inche.s. Price, in galvanised iron, 4^. 6d. 

 Complete List of Gas Furnaces fur all purposes ; Hot and Cold Blast 

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THOS. FLETCHER, Museum Street, Warrington. 

 DIAMONDS AND OTHER PRECIOUS 



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BUDOLPH KOENia 



(DR. PHIL.) 

 MANUFACTURER OF 



ACOUSTICAL INSTRUMENTS. 



TO ILLUSTRATE THE LAWS 

 AND TO PRODUCE THE PHENOMENA OF SOUND. 



PARIS, 26, RUE DE PONTOISE. 



PRICE LISTS FREE. 



EAGLE INSURANCE COMPANY, 



79, PALL MALL. 

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GEORGE HUMPHREYS. Actuary and Secretary. 



THE SOiOPTICON. 



CATALOGUES FREE. 



THE SCIOPTICOE COMPANY, 

 GREAT 



PORTLAND 



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LONDON, W. 



R. W. NEEYES, 

 PHILOSOPHICAL INSTRUMENT 



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PRICE LIST, FOUR STAMPS. 



11, SIDMOUTH STREET, LONDON, W.C. 



