CONCHOLOGY. New and interesting Species of Recent Shells from Borneo, Philippine COLLECTIONS AND SPECIMENS BOUGHT. COLLECTIONS FOR MUSEUMS FROM £5 TO £300. EXCHANGES MADE FOR SPECIES NOT IN STOCK. GLASS-TOPPED BOXES, CARD TRAYS, &c. All kinds of Glass-Topped Boxes, &c., manufactured on the premises, and supplied promptly at moderate prices. Rectangular, from 1s. 3d. per dozen. Card Trays, 45. gross; Glass Tubes, 45. gross. HUGH FULTON (Conchologist), SAMUEL HENSON, LAPIDARY MINERALOGIST, &c. Precious Stones Cut and Mounted to any Design. Always on hand. Beautiful Carved Queensland Opals, Labradorite, Rock Crystal, Agate, &c. &c. Choice Specimens of New Minerals suitable for Collectors and Museums. The Finest Collection of Mocha Stones ever made now on View. Diatomaceous Earth, Hakodadi, Japan. Collections and Apparatus for Student or Prospector. LESSONS GIVEN. SAMUEL HENSON, 97 REGENT STREET, LONDON, W. MESSRS. MACMILLAN AND CO.'S NEW BOOKS. THE COLLECTED WORKS OF THOMAS HENRY HUXLEY, F.R.S. In Monthly Volumes from October 1. Globe 8vo. 5s. each Volume. (THE EVERSLEY SERIES.) A TREATISE ON THE THEORY OF FUNCTIONS. BY JAMES HARKNESS, A SHORT COURSE IN THE THEORY OF DETERMINANTS. BY LAENAS AN ESSAY ON NEWTON'S PRINCIPIA. By WALTER W. ROUSE BALL, Fellow and Assistant Tutor of Trinity College, Cambridge. Crown 8vo, 6s. net. UTILITY OF QUATERNIONS IN PHYSICS. By ALEXANDER MCAULAY, M.A., Lecturer in Mathematics and Physics in the University of Tasmania. 8vo, 5s. net. INORGANIC CHEMISTRY FOR BEGINNERS. F.R.S. Assisted by JOSEPH LUNT, B.Sc. (Victoria). Globe 8vo, 2s. 6d. BY SIR HENRY ROSCOE, TEXT-BOOK OF GEOLOGY. By Sir ARCHIBALD GEIKIE, F.R.S. Third Edition. Medium 8vo, 28s. TABLES FOR THE DETERMINATION [Immediately. OF THE ROCK-FORMING MINERALS. Compiled by F. LOEWINSON-LESSING, Professor of Geology at the University of Dorpat. Translated from the Russian by J. W. GREGORY, B.Sc., F.G. S., of the British Museum (Natural History). With a chapter on the Petrological Microscope by Prof. G. A. J. COLE, M. R.I.A., F.G. S. Super Royal 8vo. 4s. 6d. net. INTRODUCTION TO THE STUDY OF POLITICAL ECONOMY. Being an entirely rewritten third edition of the Guide to the Study of Political Economy by LUIGI COSSA, Professor in the Royal University of Pavia. Translated by LOUIS DYER. Crown 8vo, 8s. 6d. net. MICROSCOPES AND APPARATUS. WATSON & SONS' VAN HEURCK MICROSCOPE WATSON & SON'S perfected form of FINE ADJUST- Full IllustratedCatalogue of Microscopes and Apparatus sent Postfreeon application to GAS ENGINES. 'SNOS 8 NOSLVM M Highest Award to Gas Engines. Crystal Palace Exhibition Opticians to II. M. Government, 313, HIGH HOLBORN, LONDON, W.C., FRY'S Pure Concentrated COCOA 60 Prize Medals Awarded to the Firm. BE CAREFUL TO ASK FOR FRY'S PURE CONCENTRATED COCOA. PERKEN, SON, AND RAYMENT, MANUFACTURERS. WRITE FOR OUR CATALOGUE. IT IS SENT POST FREE. Printed by RICHARD CLAY AND SONS. LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published by MACMILLAN AND Co., at 29 Bedford Street, London. W.C., and 112 Fourth Avenue, New York.-THURSDAY, September 28, 1893 NEWTON'S PATENT Scientist's Biunial Lantern, NALDER BROS. & CO., Cambridge and London University 16, RED LION STREET, CLERKENWELL Extension Lecturers, &c. By Special Appointinent TO THE ROYAL INSTITUTION OF GREAT 3 FLEET STREET, LONDON. GRIFFIN'S NEW CATALOGUE OF PURE CHEMICALS, REAGENTS, AND LONDON, E.C. 4, 5, or 6 inch, with Patent Indestructible and Magnifying Index, 5s. 6d. each, in Metal Case. 4, 5, or 6 inch, with Patent Indestructible and Magnifying Lens Front, 7s. 6d. each, in Metal Case. Half a Dozen sent free by Registered Post, and insured against loss of breakage, to any country within the Postal Union, on receipt of Remittance. NEGRETTI & ZAMBRA are the Inventors and Patentees of the Indestructible Index, upon which principle all Clinical Thermometers of the present day are made MINERALS FOR ANALYSIS. NEGRETTI & ZAMBRA, POST FREE UPON APPLICATION. JOHN J. GRIFFIN & SONS, L 22 GARRICK STREET, LONDON, W.C. Scientific Instrument Makers to H. M. the Queen and Royal Family, Ob. DEPARTMENT OF SCIENCE AND ART. STEPHEN'S GREEN, DUBLIN. The Royal College of Science supplies Courses of Instruction in the Sciences applicable to the Industrial Arts, especially those which may be classed broadly under the heads CHEMICAL MANUFACTURES, ENGINEERING, and MINING. A Diploma of Associate of the College (A. R.C. Sc., I.) is granted at the end of the Three Years' Course, the required conditions being complied with. Four Royal Scholarships, of the value of £50 yearly each, with free admission to the Lectures and Laboratories, are attached to the College. Two are offered for competition each year to Associate Students not being Royal Exhibitioners, on the completion of their First Year's Course. The Fees payable by Non-Associate Students are-2 for each separate Course of Lectures, £3 for Session-Pure Mathematics, 1st year, £2 for term, do., do. FOR ANALYTICAL CHEMISTRY-£2 for a Special Course of One Month; £5 for Three Months: £9 for Six Months; 12 for the entire Session. FOR PHYSICAL LABORATORY-£2 for a Special Course of One Month; 64 per Month (for Six Hours a Day): or £6 for the Session (One Hour per Day); £12 for the entire Session. FOR ASSAYING-£5 for Three Months; £9 for Six Months; £12 for the entire Session. FOR ZOOLOGICAL LABORATORY-£2 for a Special Course of One Month; £3 for 1st Medical or 2nd Arts Course Royal University of Ireland; or £5 for a Special Course of Three Months. FOR BOTANICAL LABORATORY-Same as Zoological Laboratory. FOR GEOLOGICAL LABORATORY-£2 for a Special Course of One Month. FOR DRAWING SCHOOL-65 for the Session: £3 for One Term. The Chemical, Physical, Botanical, and Zoological Laboratories and the Drawing Schools are open Daily for Practical Instruction, and the Geological Laboratory is open for Non-Associate Students at hours to be arranged with the Professor. The Courses of Chemistry, Physics, Botany, Zoology, Geology, and Mineralogy are recognised by the Royal University of Ireland, and Certifi cates of Attendance are granted to Medical and other Students attending the Courses, and the Chemical, Physical, Botanical, and Zoological Laboratories. Programmes may be obtained on application at the College; or by letter addressed to "The Secretary, Royal College of Science, Stephen's Green, Dublin." The First Term of the Session will commence on MONDAY, OCTOBER 2, 1893. NOTE.-Intending Associate Students will be required to pass an Entrance Examination in Elementary Mathematics and Elementary Practical Geometry, as indicated on p. 5 of Programme, copies of which may be had on applicaion from the Secretaay. Prof. J. P. O'REILLY, Secretary. UNIVERSITY COLLEGE, LONDON. DEPARTMENT OF GENERAL PATHOLOGY AND BACTERIOLOGY. BALLIOL COLLEGE, CHRISTCHURCH, AND TRINITY COLLEGE, OXFORD. NATURAL SCIENCE SCHOLARSHIPS AND EXHIBITIONS A combined Examination for Natural Science Scholarships and Exhibi tions will be held by the above Colleges, beginning on TUESDAY, NOVEMBER 21. 1893. Three Scholarships and Three Exhibitions will be offered, the Scholarships being worth £80 a year. The subjects for examination will be Physics, Chemistry, and Biology, tu: Candidates will not be expected to offer themselves in more than two of these. Particulars may be obtained by application to A. VERNON HARCOURT, Christ Church, Oxford. GENERAL ENGINEERING COLLEGE, AND SCHOOL OF SCIENCE. PENYWERN HOUSE, 2 and 4, PENYWERN ROAD, EARL'S COURT, S. W. PRINCIPAL-G. W. DE TUNZELMANN, B.Sc., M.I.E.E. SENIOR-INSTRUCTOR-C, CAPITO, M.I.E.E., M.I.M.E. Laboratories, Dynamo Room, Steam Engine, Engineering Workshop with Machine Tools, Pattern Shop, &c. The College provides a Training for Electrical, Mechanical, Civil, and Mining Engineers. for Science Students in Mathematics, Physics, Chemistry, Biology, Geology, and Mineralogy, and Preliminary Training for Students entering Cooper's Hill and the Central Institution. Sale by Auction. TUESDAY NEXT, OCTOBER 10. IMPORTANT ON SALE BY BOOKS VALUABLE COLLECTION OF HORNS, ANIMAL SKINS, MACMILLAN & BOWES, INSECTS, ETC. MR J. C. STEVENS will Sell by Auction, at his Great Rooms, 38, King Street, Covent Garden, on TUESDAY, Next, OCTOBER 10, at half-past 12 precisely, a Valuable Collection of Horns, Animal Skins, Exotic Insects, Minerals, Fossils, Shells. British Lepidoptera, Birds' Skins, Eggs, and other Natural History Specimens, Books, &c., &c. On view the Day prior, to till 5, and Morning of Sale, and Catalogues had. DUST IN AIR. CAMBRIDGE. HARRIOT.-Artis Analytica Praxis. 1631. 125. HERSCHEL, CAROLINE.-Catalogue of Stars. 1798. HOUEL.-Calcul Infinitesimal. 4 vols. 1878-81. Fine copy. £2 25. 95. HUYGHENS.-Opera. 4 vols. 1724-28. 215. JACOBI.-Werke. Vols. 1 to 6, and Supplement Band. 1881-91. £4 185. Instruments designed by JOHN AITKEN, Esq., F.R.S., &c., JACOBI.-Canon Arithmeticus. 1839. 155. and made by WILLIAM HUME, Edinburgh. THE POCKET DUST COUNTER Has Moist Chamber, Millimetre Scale on glass, Viewing Lens, Graduated Measuring Air-pump, 2 Stopcocks. In Case. 41 x 3 x 11: Weight, 10 ozs. PRICE £6 6s. THE KONISCOPE, For the Study of the Colour Phenomena of Cloudy Condensation, due to dust. Half-metre Moist Chamber Glass Ends, Air-pump and Stopcock; Weight, 1 lb. 14 ozs. PRICE £3 3s. PLATTNER'S COMPLETE BLOWPIPE FOR GEOLOGISTS, MINERALOGISTS, AND SCIENTIFIC For the Qualitative and Quantitative Analysis of Minerals, including very numerous Assay and Blowpipe Tools and Reagents, with a fine Balance in collapsible glass case. Travelling Case measures 214 X 17 X 18; weighs 50 lbs. PRICE £25 12s. 6d. THE CANTILEVER PROJECTION LANTERN. Flat and Open Stage, for use at Science Lectures, Physical and Chemical Experiments. Shows Lung and Whole Brain Sections for Physiologists and Pathologists. Condensers 5 to 16 inches diameter. PRICES from £6 10s. ILLUSTRATED DESCRIPTIVE PAMPHLET. WILLIAM HUME, SCIENTIFIC INSTRUMENT MAKER, 2 WEST COLLEGE STREET, EDINBURGH. SCIENCE MASTER wanted at once for CHEMISTRY and PHYSICS in good School. Graduate or Royal College of Science. Salary £130 (about), resident. SECRETARY, Association of Assistant Masters' School, Victoria Park, N. E. Fee, half-a-crown. No other charges. JAMIN AND BOUTY.-Cours de Physique. 4 vols. in II. 1881-83. £2 25. JELLETT, J. H.-Calculus of Variations. 1850. 50s. JOULE, J. PRESCOTT.-Scientific Papers. 2 Vols. 1884-87. 275. KAESTNER.-Geschichte der Mathematik. 4 Vols. 17961800. 145. KEPLER.-Nova Stereometria, &c. 1616. 36s. KERSEY.-Algebra. 2 Vols. 1673-74. 10s. 6d. KIRCHER.-Item Extaticum Coeleste. 1660. 155. LACROIX.-Calcul Differentiel et Calcul Integral, 3 Vols. 1810. 325. LAGRANGE.-Euvres. 14 Vols. 1867-92. 13 10s. LAPLACE. -Mecanique celeste, trans. by BOWDITCH. 4 Vols. 17 175. LAPLACE.-System of the World, trans. HARTE. 2 Vols. 3 Vols. |