Sept. 4, 1879] 



NATURE 



cli 



DIAMONDS IN MATRIX. 



R. C. NOCKOLD, Diamond and Oriental Stone Cutter and Dealer, has 

 for sale specimens of the above; also Cut Precious Stoues in all Colours. 



12, FRITH STREET. SOHO. W. 



ELECTRICAL APPARATUS. — Science 



Teachers, Lecturers, and Amateurs, should send for Special Reduced 

 "List. FRICITONAL APPARATUS of new patterns and improved 

 insulation. HOLTZ MACHINES, warranted reliable in all weathers, 

 from;^4. Large set of IJrass Induction Conductors, 2 i2-inch Cylin- 

 \3ers. Sphere, Hiot's Hemispheres, 6^-inch, eb'^nite mounted, 50J. Large 

 Uranium Glass Aurora Tubes. P^jWERFUL LEYDEN BAT- 

 TERIfc;S, new construction, half cost cf usual jar>. VOLTAIC AP- 

 PARATUS. — Batteries, Quart Bunsen's, ^s. and 4s. 6d. ^-gallon 

 Bichromate, 12 Cells, in Case, £,%. Grove and all other Cells. M EUI- 

 CAL BATTERIES. ELECTRIC LAMP for lantern use, £6 6f. ; 

 action equalling the most expensive. Cheaper Lamps. Coils, own 

 make, i-inch Spark, 7Sf. Bells, Wires, Carbuns, and all requirements. 



F. H. BROOK, 107, Lorrimore Road, Londcn. S.E. 



ROYAL SCHOOL OF MINES. 



DEPARTMENT OF SCIENCE AND ART. 



During the Twenty-nirth Sefsion. 1879-80, which will commence rn the 

 ist of October, the following COURSES of LECTURES and PRACTI- 

 CAL DEMONSTRATIONS will be given :— 



Chemistry. 

 Metallurgj'. 



By E. FrankJand, Ph.D.. F.R.S. 



By John Percy, M.D., F.R.S. 



3. Biology. ByT. H. Huxley, LL.D., F.R.S. 



4. Mineralogy. 1 By Wariogton W. Smyth, M.A., F.R.S., 



5. Mining. J Chairman. 



6. Geology. By John W. Judd, F.R S. 



7. Applied Mechanics. By T. M. Goodeve, M.A. 



8. Physics. By Frederick Guthrie. Ph.D., F.R.S. 



9. Mechanical Drawing. By Rev. J. H. Edgar, M.A. 



The Lecture Fees for Students desirous of becoming Associates are ^^30 

 in one sum, on entrance, or two annual payments of ;^2o, exclusive of the 

 J-aboratories. 



Ticlteis to separate Courses of Lectures are issued at jf 3 and £,\ each. 



Officers in the Queen's Service, Her Majesty's Consuls, Acting Mining 

 Agents and Managers, may obtain Tickets at reduced prices. 



Science Teachers are also admitted to the Lectures at reduced fees. 



For Particulars (free) or for Official Prospectus (price ^., by post ^d^ 

 jFply to the Registrar, Royal School of Mines, Jermyn Street, London, 



F. W. RUDLER, Regiitrar. 



ST. THOMAS'S HOSPITAL, ALBERT 

 EMBANKMENT, S.E. 



The WINTER SESSION. 1879-80. will commence on OGTTOBER ist. 



TWO ENTRANCE SCIENCE SCHOLARSHIPS of /60 and £,^0, 

 OPEN to all First Year's Students, without the condition of their having 

 iirst entered as Students of the Hospital, will be awarded in the first week or 

 Oaober. Subjects : Chemistry and Physics, with either Botany or Zoology, 

 at option. SPECIAL CLASSES for the PRELIMINARY SCIENTIFIC 

 of University of London, with Practical Work in Laboratories and Museums, 

 ■re to be held from October to July, and for the ist M.B. from January to 



Several Medical Practitioners in the neighbourhood receive Students for 

 residence and supervision, and a register of mspected and approved lodgings 

 is kept in the Stcretaiy's office. 



Prospectus and all particulars may be obtained from the Secretary, Dr. 

 Gillespie, at the HospitaL 



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



SHEPPEY FOSSILS. 



W. H. SHRUBSOLE, F.G.S., Shfkrnkss-on-Ska, h.iving a large 

 quantity of the above on hand, offers. FOR A FEW WEEKS ONLY, 

 100 good Specimens, correctly named, for 5^. ; 100 assorted Specimens, un- 

 named, 3*. Not less than 50 sent at these rates. 



Mn TENNANT, F.G.S., Professor of 



Mineralogy »nd Geology, Mineralogist by Appoinemcnt to Her Majesty 

 and the Baroness Burdett-Coutts, 1^9. Strand, London, W.C.. having 

 been fifty years ia business, contemplates shortly RETIRING, and 

 offers for SALE several of his extensive COLLECTIONS of Minerals, 

 Rocks, and Fossils. They are well adapted for first-class Educational 

 Establishments, Provincial or Colonial Museums, or for the Private 

 Study of any Scientific Person wishing to become acquainted with the 

 above-menlioned Sciences. From C\,aoa to 5,000 Gumeas. Students' 

 Collections at 2, 5, 10, 20, to 50 Guineas. 



tABORATORY, 38. GRACECHURCH STREET, LONDON, E.C. 



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



WATER ANALYST, 



Performs every description of Water Analysis on moderate termi. 



ftroperly cleansed bottlej for the reception of samplei senj to any p«rt of 

 the K<agdjm. 



^ale i)B Auction. 



NATURAL HISTORY SPECIMENS. 



MR. J. C. STEVENS will SELL by AUG- 



TION, at his Great Rooms, 38, King Street, Covent Garden, on 

 TUESDAY, September 9th, at Half-past Twelve, precisely, several 

 small Collections of British and Foreign Lepidoptera, Insect Cabineis 

 and B;'xe<:, Bird and Animal Skiasj Shel's and Fossils> and other sped* 

 mens of Na'.ural Histjry. 



May be viewed the Morning of Sale, and Catalogues had. 



THIN GLASS FOR MICROSCOPIC 



td. 



MOUNTING, of best quality. Circles, v. td. per ounce ; Squares, 

 ar. 9</. ; post free rtd. extra : Ground edged Slips, s*. per gross : also 

 ot'ier Mounting Materials and Objects prepared for mounting.— CHAS. 

 PETIT. 151, High Street. Stoke Newington. N. 



ELECTRICAL and SCIENTIFIC APPA- 



RATUS. — MicDphones 06 every form. Hughes' Induction Balance, 

 Electric Bells, Indicators, Fire- and Thief -Alarms, New Constant 

 Batteries, Induction-Coils and Frictional Machines. Magnets. Insulated 

 Wire.«, Screws, and all materials. liberal Terms to Schjols and 

 Science Teachers. Apparatus on hire. Complete Electric Catalogue, 

 2 stamps. Optical and Photographic List, i stamp.— DALE and 

 CRAMPTON, Manufacturing Electr.cians, 4, Little Britain, London, 



FLETCHER'S 

 SOLID FLAME BURNER. 



rOR COOKING, LABORATORY WORK. 



SMALL STEAM ENGINES, ' ' ' 



ZINC AND LEAD MELTING, &c. 



The most perfect burner known, will burn in one SOLID 



flame any quantity of gas, and is by far the cheapest both in 



first cost and economy of gas. Made in all sizes, in both brass 



and iron for all purposes. 



ILLUSTRATED LIST ON APPLICATION. 



ALSO OF 



GAS FURNACES FOR ALL PURPOSES 



INSTANTANEOUS WATER HEATERS 



HOT AND COLD BLAST BLOWPIPES 



AUTOMATIC FOOT AND HAND BLOWERS, &c. 



THOS. FLETCHER, 



MUSEUM STREET, WARRINGTON. 



NEW ILLUSTRATED CATALOGUE of ELECTRIC 



SIGNALS, &c., with Instructions for Filling. 150 Diagrams. Justout. 

 post free, 6 Stamps. j—.i^ui, 



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. 



Elntrictl A//aratus of all Dtscrifllans for Lecluri Purposes Loaiud out. 

 ^^'sCHOOLS '°' ^^^^^ DEMONSTRATION Md tor SCIENCE 

 ELECTRIC LIGHT APPARATUS. 



SIEMEN'S »nd GRAMME-S DYNAMO MACHINES and LAMPS 

 for Hire and Purch,ase. 



^'VS'-'i,*!^^'*'**'^'^''^ °f RUHMKORFF COILS and VACUUM 



PROFESSOR HUGHES' MICROPHONE. 



ELECTRIC BELLS and INDICATORS 



TELEPHONES aad TELEPHONE CALL BELLS, WIRE. 4c., for 



EDISO.VS ELECTRIC PEN 1% ts 



ELECTRIC and MAGNETIC APPARATUS of all De«:riptionfc 

 llJuitrated Catalogue fcectrical Apparatus. Part i. Post free. 6 Sumpfc 

 do do Electric SignaU, Part .. Post free, 6 Stamps. 



