NEW WATER MOTOR. For Chemical and Physical Laboratories, A, £1 168... B, £2 10s... C, £8 6s. D. £18. Aneroid Barometer with Altitude Scale, Compass with Patent Dial and Thermometer for Air Temperatures (or a Clinical Thermometer may be substituted) PRICE £4 10s. to £7 10s. Illustrated Price Lists posted free to all parts of the World. NEGRETTI & ZAMBRA, TRINIDAD. ASSISTANT TO GOVERNMENT ANALYST. Salary, 150, and Free Passage to Colony. Must have attended a Full Course of Lectures on Inorganic and Organic Chemistry at the Royal College of Science, South Kensington, or some other College of equally high standing as a School of Chemistry: experience in Quantitative Analysis essential, and a knowledge of Agriculture desirable. Duties are to assist generally in the analytical and educational work of the Government Laboratory. Candidates must be unmarried. Applications, which should be in writing, should be addressed to the ASSISTANT PRIVATE SECRETARY, Colonial Office, Downing Street, London, on or before MARCH 22. DEMONSTRATOR AND ASSISTANT LECTURER IN ELECTRO-TECHNOLOGY. The Senate of University College, Liverpool, wish to appoint, soon after Easter, to the DEMONSTRATORSHIP in ELECTRO-TECHNOLOGY, a Competent Lecturer who has had actual experience in Electrical Works, as well as a sound training in General Physics. He will have to take charge of the Electro-Technical Laboratory, and be responsible to the Professor of Physics for the instruction of Electrical Engineering Students, and also of Evening Students once or twice a week. The Salary offered is £200 a Year. Apply to Prof. OLIVER LODGE. UNIVERSITY COLLEGE, DUNDEE. SECRETARY AND REGISTRAR. The Council is prepared to receive Applications for the above Post, vacant in consequence of the present Secretary's election to the Clerkship of the Glasgow School Board The Salary is £150 per annum, and the appointment includes the Secretaryship of the Technical Institute. The successful Candidate will be expected to enter on his duties as soon as possible. Particulars may be obtained from the undersigned, to whom Candidates are requested to forward not more than Four Testimonials (twenty-five copies), with References, on or before MONDAY, MARCH 21. G W. ALEXANDER, M.A., Secretary. THE GLASGOW AND WEST OF SCOTLAND TECHNICAL COLLEGE. PROFESSORSHIP OF CHEMISTRY VACANT. The Governors are prepared to receive applications for the "Freeland" Chair of Chemistry, which has been instituted under the reorganization of the whole Chemical Department consequent upon the death of Prof. DITTMAR. Information as to duties, salary, &c., may be obtained on application. JOHN YOUNG, M.A., B.Sc., Secretary. 38 Bath Street, Glasgow. THE VICTORIA UNIVERSITY. A GILCHRIST SCHOLARSHIP, of the value of £50 per annum, and tenable foor Three Years, in Owens College, Manchester, or in University College, Liverpool, or in Yorkshire College, Leeds, will be awarded on the results of the Preliminary Examination held in June 1892. Candidates, who must not be more than eighteen years of age, are required to send in their names to the VICE-CHANCELLOR, on or before June 1. Further Particulars can be obtained from the UNIVERSITY REGISTRAR, or from the REGISTRAR of either of the Colleges above-named. Manchester, February 1892. OWENS COLLEGE, MANCHESTER. COMMERCIAL GEOGRAPHY, whose engagement will extend from The Council is prepared to appoint a LECTURER in POLITICAL and the end of MARCH to the early part of JUNE, and will be renewable. Applications, with references, should be forwarded not later than MARCH 15, to the REGISTRAR, who will furnish information as to duties and emoluments. H. W. HOLDER, M.A., Registrar. UNIVERSITY COLLEGE, NOTTINGHAM. A SCHOLARSHIP of £150 per annum, open to those who have been Students for Three Years at this College, will be filled up early in April. The successful Candidate will have to devote himself to research in either Physics, Chemistry, or Engineering, during the tenure of his Scholarship. Particulars may be had at the SECRETARY'S Office. GUY'S HOSPITAL. ENTRANCE SCHOLARSHIPS IN SEPTEMBER, 1892. Four OPEN SCHOLARSHIPS, two (125 Guineas and 50 Guineas) in Science, and two (100 Guineas and 50 Guineas) in Arts. Particulars and Copies of Examination Papers on application to the DEAN, THOMAS E. BOLTON (Son and Successor of the late THOMAS BOLTON, F.R. M.S., to whom was awarded a Gold Medal at the Fisheries Exhibition, 1883), FARLEY ROAD, MALVERN. MINERALOGY. SAMUEL HENSON, 97 REGENT STREET, LONDON, W. ESTABLISHED 1840. Late 277 STRAND. Choice Mineral Specimens, Gem Stones, Carved Opals, Polished Agates, Rock Crystal Balls, Fossils, Rocks, and Rock Sections. LATEST ARRIVALS. A Magnificently Crystallized Realgar. Crystallized Pyrrhotine, Altaite (very rare), Wheal Maudlin Chalybite, Pink Grossular Garnets, Gummite, Auerlite, Pyrrhite, Brookite, Tremadoc, Blue Topazes, and Crystallized Gold Nuggets from South Africa. Also Diatomaceous Earth from Hakodati Japan. F. H. BUTLER, M.A. Oxon., Assoc.R.S.Mines, NATURAL HISTORY AGENCY, 158 BROMPTON ROAD, LONDON, Dealer in Rocks, Minerals, Fossils, and other Objects of Scientific Interest. Mr. BUTLER has now on view a large and varied series of example of the Volcanic Rocks of PANTELLERIA, Italy (hitherto but little known to British collectors), obtained by him during his recent visit to that island. Micro-sections of these, including products of the submarine erup tor in October last, are in course of preparation. Characteristic sets or single specimens can be furnished on application. The collection of rocks formed by Mr. Butler in Vulcano, Lipari, Salina, and the Vesuvian area is now also on view. Among the last additions to stock are Micro-sections of the lately-described Riebeckite rock from Mynydd Mawr. COLLECTIONS OF MINERALS, ROCKS, OR FOSSILS, For the Use of Students, Science Teachers, Prospectors, &c., and to illustrate the leading Text-books, in Boxes, with Trays. 50 Specimens, 10s. 6d. ; 100 do., 21s.; 200 do., 42s. New Price List of Minerals, Rocks, and Stratigraphical Series of Fossils Post Free. ROCK SECTIONS for the MICROSCOPE from 1s. 6d. each, Post Free. CATALOGUES GRATIS. CABINETS, GLASS-CAPPED BOXES, TRAYS, HAMMERS, &c. always in Stock. THOMAS D. RUSSELL, 78 NEWGATE STREET, LONDON, E.C. JAMES R. GREGORY, MINERALOGIST AND GEOLOGIST. SPECIAL AND TYPICAL COLLECTIONS FOR STUDENTS, LECTURERS, MUSEUMS, &c., As supplied to the Science and Art Department, South Kensington. EVERY REQUISITE FOR PRACTICAL WORK, Also, Museum Fittings, Cases, and all Materials for Display, &c., of Specimens. COLLECTIONS OF MINERALS, FOSSILS, & ROCKS, To Illustrate all Elementary Works. SPECIAL COLLECTIONS FOR EACH WORK. NEW LISTS NOW READY, And may be had Post free on application at the Repository and Museum, 88 CHARLOTTE STREET, FITZROY SQUARE, Complete, with Oil Lamp or Gas Jet, Sale by Auction. MONDAY, MARCH 21. NATURAL HISTORY SPECIMENS. MR. J. C. STEVENS will sell by Auction On view the Saturday prior, from 10 till 4, and Morning of Sale, and GLASS-TOPPED BOXES. 1 inches by 14 inches, depth 1 inch, per dozen is. 4d. IS. 6d. 25. od. Circular Boxes, Card Trays, Glass Tubes, &c. HUGH FULTON, hour, and the dots an Sole Agent in this country- WIMSHURST MACHINE. Best made, Studded Plates. WITH 15-INCH PLATES, £4 10 O NEW POLARIZING PRISM. СНЕАР SCHOOL APPARATUS HARVEY PEAK, 56 CHARING CROSS ROAD, W.C. PERKEN, SON, & RAYMENT, Each Magic Lantern is efficient for exhibitions. The Lens gives crisp definition, being a superior Achromatic Photographic Combination (large diameter back lens), with rack and pinion. It is fitted to a telescopic lengthening tube, so gaining increased focal accommodation. The Condenser is composed of two plano-convex lenses of 4 inches diameter. The Refulgent Lamp has 3 wicks (or 4 wicks 2s. extra) yielding a brilliantly-illuminated picture. Each is complete in Box. BOOK ON THE MAGIC LANTERN: ITS CONSTRUCTION AND USE. OPTIMUS" PROJECTOR, FOR SKETCHING. Any photograph or sketch inserted in the stage is projected on to a sheet of canvas or paper placed below, so that an enlarged or reduced Contains Complete Instructions (Cloth Covers), Price 6d. LANTERN PHOTOGRAPHS, 125. per doz. PLAIN, 18s. 6d. per doz. COLOURED. Perforated Russian Japanned Metal Magic Iron Body. Brass Sliding Lantern, Tubes, Mahogany outside Body, CATALOGUE POST FREE AN ENTIRELY NEW YEAR-BOOK. THE YEAR-BOOK OF SCIENCE. Edited by Prof. BONNEY, F.R.S., And containing Contributions by leading Scientific Writers. "THE YEAR-BOOK OF SCIENCE" is intended to be a chronicle of the progress made annually in those branches of knowledge which are commonly included under the title of Natural Sciences. It is prepared not for specialists only, but for the information of those persons who take a general interest either in certain branches of science or in scientific work as a whole. A Prospectus will be sent Post-free on Application. CASSELL & COMPANY, LIMITED, London, Paris, and Melbourne. Just Published, Price 4d. Natural History and Scientific Book Circular, No. 115, PHYSICAL GEOGRAPHY, AERONAUTICS, ELEC- Extract from review in Symons's Monthly Meteorological "During the existence of the Meteorological Magazine-i.e. during more than a quarter of a century, no English bookseller has, to our recollection, published a catalogue which, as regards meteorology, can compare with the above. . . . The majority of the works are modern, and both among the early and the late ones there are books which we have never before seen, and which may be regarded as rarities. . The misprints would be few in number were the work a bibliography, for a sale catalogue they are excep tionally rare." W. WESLEY & SON, 28 ESSEX STREET, STRAND, LONDON. ON SALE BY MACMILLAN AND BOWES, CAMBRIDGE. TRANSACTIONS OF THE ROYAL SOCIETY OF MEMOIRS OF THE ROYAL ASTRONOMICAL MONTHLY NOTICES OF THE ASTRONOMICAL PEARSON, W.-Introduction to Practical Astronomy. 2 (No. 238). A CATALOGUE OF BOOKS IN GENE- YOUNG J. PENTLAND'S LIST. Ready this Day, Crown 8vo, Pp. xvi., 642, with 32 Pages of Illustrations, OUTLINES OF ZOOLOGY. By J. ARTHUR Just Published, Crown 8vo, Cloth, Pp. xvi., 260, with 164 Illustrations and Crown 4to, Extra Cloth, Gilt Top, with 70 Plates, Exhibiting over 400 IN ILLUSTRATIONS OF ZOOLOGY. Second Edition, 8vo, Pp. viii., 374, with 408 Wood Engravings, Prices. By Dr. W. J. BEHRENS. Translated from the German. Revised by Dundee. THE EVOLUTION OF SEX. By Prof. PATRICK GEDDES and J. ELECTRICITY IN MODERN LIFE. By G. W. DE TUNZELMANN. THE CRIMINAL. By HAVELOCK ELLIS. SANITY AND INSANITY. By Dr. C. MERCIER. MANUAL TRAINING. By Dr. C. M. WOODWARD. SCIENCE OF FAIRY TALES. By E. SIDNEY HARTLAND. PRIMITIVE FOLK. By ELIE RECLUS. THE EVOLUTION OF MARRIAGE. By Prof. CHAS. LETOURNEAU THE MAN OF GENIUS. By Prof. LOMBROSO. London: WALTER SCOTT, 24 Warwick Lane, Paternoster Row. DIARY OF SOCIETIES. LONDON. THURSDAY, MARCH 10. ROYAL SOCIETY. at 4.30.-The Bakerian Lecture-The Grand Currents of Atmospheric Circulation: Prof. James Thomson, F. R.S. (To be read by the President.) MATHEMATICAL SOCIETY, at 8.-On the Analytical Theory of the Con- LONDON INSTITUTION, at 6.-The Diamond (Illustrated): F. W. Rudler. FRIDAY, MARCH 11. PHYSICAL SOCIETY, at 5.-Thermodynamics and the Action of Light on Silver: H. M. Elder.-On Choking Coils: Prof. J. Perry, F.R.S. INSTITUTION OF CIVIL ENGINEERS, at 7.30.-The Manufacture of OilGas at the Holloway Works of the Great Northern Railway Company: James B. Ball. ROYAL INSTITUTION, at 9.-Japanesque: F. T. Piggott. AMATEUR SCIENTIFIC SOCIETY, at 8.-The Labradorite Rocks of Volhynia: W. F. Hume.-Recent Investigations on Flame-Structure (with Experiments): S. Pace. ZOOLOGICAL SOCIETY, at 8.30.-On the Classification of Birds: Dr. H INSTITUTION OF CIVIL ENGINEERS, at 8.-Petroleum Engines: Prof. W. ROYAL INSTITUTION, at 3.-The Brain: Prof. Victor Horsley, F.R.S. WEDNESDAY, MARCH 16. SOCIETY OF ARTS, at 8.-Iceland: Dr. Tempest Anderson. ROYAL MICROSCOPICAL SOCIETY, at 8.-Virtual Images and Initial Magni- ROYAL SOCIETY, at 4.30.-The following papers will probably be read:- INSTITUTION OF ELECTRICAL ENGINEERS, at 8. ROYAL INSTITUTION, at 3.-The Progress of Romance in the Middle Ages: Prof. W. P. Ker. LONDON INSTITUTION, at 6.-The Chief Astronomical Observatories of the World: Dr. A. A. Common, F.R.S. FRIDAY, MARCH 18. INSTITUTION OF CIVIL ENGINEERS, at 1. 30.-Students' Visit to the Salopian Wharf, Lots Road, Chelsea, to inspect the Works of the Refuse Disposal Company; and subsequently to the Destructor Works of the Ealing Local Board. ROYAL INSTITUTION, at 9.-Modern Satire in Black and White : George Du Maurier. SATURDAY, MARCH 19. ROYAL INSTITUTION, at 3.-Matter; at Rest and in Motion: Right Hon Lord Rayleigh, F.R.S. STANLEY Mathematical Instrument Manufacturer to H.M. Government, Council of India, Science and Art Department, Admiralty, &c. Mathematical, Drawing, and Surveying Instruments of every description, Of the Highest Quality and Finish, at the most Moderate Prices. Illustrated Price List Post Free. W. F. S. obtained the only Medal in the Great Exhibition of 1862 for Excellence of Construction of Mathematical Instruments, and the only GOLD MEDAL in the International Inventions Exhibition 1885 for Mathematical Work. Silver Medal, Architects' Exhibition, 1886. Address:-GREAT TURNSTILE, HOLBORN, LONDON, W.C. TRANSIT INSTRUMENTS. CLARK'S PATENT TRANSIT INSTRUMENTS may be obtained as usual. A. J. FROST, II Victoria Street, Westminster. TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LANTERN, used by late W. LANT CARPENTER, Esq., Prof. FORBES. New Triple constructed for B. J. MALDEN, Esq., this season. New Oxyhydro. gen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, Madame ADELINA PATTI, &c. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Best. Elaborately Illustrated Catalogue, 300 Pages, 15.; Postage, 5d. Smaller do., 6d. Pamphlets Free.-HUGHES, Specialist, Brewster House, Mortimer Road, Kingsland, N. Instrument Company, Cambridge. Address all communications "Instrument Company. Cambridge." Price List of Scientific Instruments, sent post free. Illustrated Descriptive List sent on receipt of is. 6d. The Cambridge Scientific Instrument Company, St. Tibb's Row, Cambridge. RECENT SHELLS. Marine, Land, and Freshwater Shells from all Parts of the World. SELECTIONS SENT ON APPROVAL. SPECIMENS EXCHANGED. COLLECTIONS PURCHASED |