Oct. 2, 1879] 



NATURE 



clxxxv 



SUBSCRIPTIONS TO NATURE 



Yearly i%s. 



Half-yearly 14?. 6rf. 



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To the Colonies, United States, the Continent, and 

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Yearly 301. 6d. 



Half-yearly 15^. dd. 



Quarterly is. 



Office : 29, Bedford Street, Strand. 



Now ready, a Revised Edition, 



NEGRETTI & ZAMBRA'S 



encyclop,5;dic 



Illustrated and Descriptive 



CATALOGUE OF 



iCIENTIFIC INSTRUMENTS. 



(Containing very numerous Comparative Tables of Reference and 



lustrated by upwards of TWELVE HUNDRED ENGRAVINGS. 



Six Hundred Pages, Royal Svo, cloth, gilt lettered. Price $s. 6d.) 



ftical, Mathematical, Philosophical, Photographic, 



AND 



STANDARD METEOROLOGICAL 



INSTRUMENTS. 



MANUFACTURED AND SOLD BY 



NEGRETTI AND ZAMBRA, 



Opticians and Scietitific Instrument Makers to 



i"he RoyalObservator^*, Greenwich ; the Admiralty ; Hon. Board of Ordnance 



Hoard of Trade ; the British Meteorological Society; the Observatories 



Kew, Toronto, Washington, Victoria; East Indian Government. 



HOLBORN VIADUCT, E.G. 



ALSO AT 



45, CORNHILL, E.G.. & 122, REGENT STREET, W., 

 LONDON. 



3T. THOMASES HOSPITAL MEDICAL 

 SCHOOL. 



ALBERT EMBANKMENT, LONDON, S.E. 



The WINTER SESSION 1870-80 will commence on October ist. 



TWO ENTRANCE SCIENCE SCHOLARSHIPS of /60 and li,o, 

 '.pen to all First Years' Students without the condition of their having first 

 entered to the Hospital, will be awarded after an examination in Cheinistry 

 and Physics, with cither Botany or Zoology at the option cf the Candidates, 

 tj be held on October 2nd, 3rd, and 4th. Instruction by Special Classes in 

 all the subjects of the PRELIMINARY SCIENTIFIC EXAMINATION 

 (,f the University of London, with practical work in the Laboratories and 

 Museums, is given from October to July ; and for the ist M.B. EXAMINA- 

 1 ION from January to July. All the Hospital Appointments are open to 

 the Students without charge. SCHOLARSHIPS and PRIZES to the 

 value of over ^300 are awarded at the end of the Winter and Summer Exa- 

 minations, as also the following Silver and Gold Medals, S:c., viz., the 

 '* Mead,** the "Cheselden," the "Solly," and the "Treasurer's" Medals, 

 and the " Grainger" and " Solly '* Prizes. The fees may be paid in one 

 /.uiii or by instalments; special entries may be made to Lectures or to Hos- 

 pital Practice, and Qualified Practitioners are admitted to Perpetual Attend- 

 ance for a small fee. SpecLil arrangements are made for Students joining in 

 their 2nd or subsc(juent years, and also for Dental Students. Several Medical 

 Practitioners residing in the neighbourhood receive Students lor residence 

 and snpenifiion, and a register or inspected and approved lodgings is kept in 

 the Secretary's Office. For Prospectus and ail particulars apply to Dr. 

 Gillespie, the Secretary, at the Hospital. 



W. M. ORD, M.D.. Dean. 



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



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



WATER ANALYST, 



Performs every description of Water Analysis on moderate terms. 



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



the Kingdom. 



LIGHTNING CONDUCTORS. 



Experience, accumulated since the time of Benjamin Franklin, proves 

 conclusively that a Conductor made of Copper of adequate size is the best 

 of all appliances for the protection of every description of building from the 

 destructive effects of lightning. 



NEWALL & CO.'S 



PATENT COPPER LIGHTNING CONDUCTOR, 



As applied to all kinds cf Buildings and Shipping in all parts of the world 

 with unvarying success, is the most Reliable, most Effective, and Cheapest 

 Conductor ever offered to the public. 



It is simple in its application, no insulators being required, and it costs 

 only one shilling per foot for the standard size, wliich is safe in any storm. 



R. S. NEWALL & CO., 130, STRAND, W.C 



36, WATERLOO ROAD, LIVERPOOL. 

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138, REGENT STREET, LONDON. 

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DUPLEX LAMPS. 

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READING LAMPS. 



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ILLUSTRATED CATALOGUES POST FREE. 



NOW READY, 

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CHEMICAL HANDICRAFT. 



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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, 

 LONDON, W.C. __^ 



MINERALOGY AND GEOLOGY. 



A New List of Collections of Foisils, Minerali, and Rocks now ready, 

 incltiding Si>ecia! Collections to illustrate the various Text-books, m 

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

 ratus and Materials of alt kinds in Cases or separately. New Patterns ofi 

 Geological Hammers, with prices. List of Now and Second-hand Books of 



JAMES R. GREGORY, 



MUSEUM OF GEOLOGY. 



88, CHARLOTTE STREET, FITZROY SQUARE. 



