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Crown 8vo, Cloth, 78. 6d. NEERS OF SCIENCE. By OLIVER LODGE, F.R.S., Professor of Physics in the Victoria University College, Liverpool. With Portraits and other Illustrations. Extra Crown 8vo, Cloth, 7s. 6d. course of lectures on the lives of epoch-making men, principally in the Department of Astronomy, giving an account of their and tracing their influence on the development of human thought. The first part of the course, called " From Dusk to Daylight," of nine lectures on the men from Copernicus to Newton inclusive, especially Tycho, Kepler, Galileo, Descartes, and aims at ring the scientific aspect of their work in a clear and intelligible manner with copious illustrations. The second part of the consists of nine lectures on such subjects as the Velocity of Light; Herschel and the Stars ; the discoveries of Astervids and of ve; Comets and Meteors ; and the Tides; with some biographical details and much scientific exposition addressed to persons try education. ATURE :-“Dr. Lodge has been able, by judiciously combining clear statements of scientific facts and laws wth interesting 11 details, to give his lectures all the charm of a romance. The book is an admirable introduction to the study of astronomy, better gift for a beginner could well be chosen ; while to those to whom many of its details are already familiar, the Sheridan Lea. THE SECOND VOLUME OF PROF. GRAY'S WELL-KNOWN WORK. ELECTRICITY AND MAGNETISM. By ANDREW GRAY, M.A., Professor of Physics in the University llege of North Wales. Vol. II., in two Parts, crown 8vo, 25s. Vol. 1., already published, price 12s. 6d. NEW WORK BY MR. R. B. HAYWARD. · ALGEBRA OF COPLANAR VECTORS AND TRIGONOMETRY. Jy R. BALDWIN HAYWARD, M.A., F.R.S., Senior Mathematical Master in Harrow School, formerly Fellow of t. John's College, Camlıridge. Crown 8vo, Clo:h, 8s, 6d. ITURH:-“This work is constructed on the methods of the school of mathematicians who derived their inspiration from hing of De Morgan, a school which is represented by many of the most influential of our recent writers on mathematical It is intende i to occupy the place of the 'Trigonometry and Double Algebra,' published in 1819 and now a long time int, at the same time incorporating such improvements in elementary treatment as have been evolved out of half a century's in of the foundations of Algebra. Those who are acquainted with Mr. Hayward's other writings, such as his ‘Elements Geometry,' will expect a fresh and interesting treatment of his subject ; and they will not be disappointed. On turning pages we constantly come across elegant touches and happy turns of expression, and historical appreciations-the stuff ostitutes the basis of literary excellence in mathematical writings. others It differs from The price, which includes Sole Agent in this country, JAMES J. HICKS, 8. 9. & 10 Hatton Garden. HARVEY & PEAK, By Appointment to the Royal Institution of Great Britain. LIGHT, AND HEAT. Catalogue of 340 Illustrations by post, 6d. "OPTIMUS" MAGIC LANTERNS "OPTIMUS” ENLARGING APPARA Adapted for use with limelight. For dissolving, two lanterns are necessary Patent Quick-Acting Rack Adjustment. FACH Lantern is efficient for exhibitions. THIS Apparatus comprises superior Mahogany Body Lane 1 The Lens gives crisp definition, being a T Bellows Camera, adjusted by Rack and Pinion superior Achromatic Photographic Combi fitted with powerful Refulgent Lamp, with three wicks, guide nation, with Rack and Pinion. Compound illumination. Compound Condensers. Condenser of 4-in, diameter, 3-wick Refulgent If with Rassis Lamp. 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BROWNING'S NEWTON'S PATENT AS MADE FOR Extension Lecturers, &c... Japanned Tin Body; 4-inch Compound Lenses, with Rack Adjustment; and power- ful Three-wick Lamp, in Strong Wood Case, Opticians to the Queen and the Government, : : complete, price £1 12s. 6d. . : By Special Appointinent TO THE ROYAL INSTITUTION OF GREAT Or with Four-wick Lamp, £1 16s. 6d. BPITAIN, 3 FLEET STREET, LONDON. | This is an admirable Lantern for making Photo graphic Enlargements. Illustrated Catalogue of Lanterns, 352 pp., Post free. JOHN BROWNING, Optical & Physical Instrument Maker, 63 STRAND, LONDON, W.C. STANDARD METEOROLOGICAL INSTRUMENTS NEW MODEL made NEGRETTI & ZAMBRA, Opticians and Scientific Instrument Makers but is now a hadsome, To Her Majesty the Queen, well-finished Instrument. HOLBORN VIADUCT, | 45 CORNHILL, & 122 REGENT STREET, LONDON. R. & J.BECK, 68 Cornhill, London, E.C. 46 PRICE LISTS TREE BY POST TO ALL PARTS OF THE WORLD. "STAR" MICROSCOPE jun., and BE BRADFORD, Mr. Liber concluded in MAY WANTED—"Nature." ROYAL COLLEGE OF SURGEONS OF LONDON GEOLOGICAL FIELD CLAS ENGLAND. A Course of Four Lectures will be delivered by Praf. H. G SRL LECTURES 1893. F.R.S., on “The Fossil Reptiles of the Thames Basin, ** at the New Hall, Farringdon Street, E.C., at 7 p.m., on FEBRUARY 7 Notice is tereby given that Prof. C. B. PLOWRIGHT will commence a following Tuesday Evenings. 'Course Tickets zs. each to be the course of Three Lectures on “ The Action of Fungi on the Human Body," Hon. Sec., Mr. J. H. HODD, 30 and 31 Hatton Garden, EC on MONDAY, FEBRUARY 6. That Prof. H. J. CAMPBELL will then deliver Three Lectures on “Intestinal Parasites belonging to the Class Neuratoda," commencing on MONDAY, FEBRUARY 20. A CHEMIST requires work as DEMOS That Prof. B. T. 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WANTED.-A Resident Curator, Meteor: Fellows and Members of the College are invited to attend. Gentlemen, LOGICAL OBSERVER, and CARETAKER for the Xis ! not Fellows or Members of the College, will be admitted on presentation of Library Buildings of the Royal Institution of Cornwall, In Su their private visiting card at the door of the Theatre. $50 per Annum, with Rooms, Coal, and Gas Applic EDWARD TRIMMER, Secretary. cates' own handwriting, stating Age and Scientific qualifica. January 28, 1893. Testimonials and References, to be forwarded, aut late RUARY 14, to MAJOR PARKYN, Truro. TELESCOPES FOR SALE, Two very fine reflectors by Cook, diameter of mirror, 81 by ob ALBERT EMBANKMENT, LONDON, S.E. tively, perfect condition. 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PUBLIC SERVICE AND UNIVERSITY DEPARTMENT.–For students preparing THE CRY OF THE CHILDREN.-AX for the various branches of the Public Service or for Scholarships at, or essay on Education by A Free Lance, Author of “On the Oro entrance into, the Universities and Hospitals. of Science" "He will receive in many quarters ceasure we a ENGINEERING DEPARTMENT.-The Complete Courses qualify Students rank as the highest praise” (Chemical Nors). Paper Caves for entry into Cooper's Hill, the Central Institution, the Royal College of net (post-free). WILLIAMS & NORGATE, Londoa. Science, and into Engineering Works. Special Courses in Electrical Engineering The extensive Physical and Chemical Laboratories are fitted up in the most complete manner for both Elementary and Advanced Work. The College is supplied with very complete Geological Collections for practical instruction. Students are regularly sent to the College by Leading Engineers and (Late CHARLES JAMRACH), Scientific Authorities, whose Names are given in the Prospectus. NATURALIST, UNIVERSITY COLLEGE OF SOUTH 180 ST. GEORGE STREET EAST. WALES AND MONMOUTHSHIRE, Implements of Savage Warfare, Idols, Sacred Masks. Perarias Porte CARDIFF. Ne tsukis, China, Lacquer, Gongs, Shells, and other Curios COLLECTIONS OF MINERALS ANATOMY and a PROFESSOR of PHYSIOLOGY. The Stipend in each case will be 6350 per Annum. Applications, together with Printed Copies of Testimonials, must be sent in on or before FEBRUARY 10, 1893. For the Use of Scudents, Science Teachers, Prospectors, &c., and a For further Particulars apply to illustrate the leading Text-books, in Boxes, with Trays IVOR JAMES, Registrar. University College, Cardiff, December 13, 1892. 80 Specimens, 10s. 60.; 100 do., Pls. ; 900 do., 4 Now Price List of Minerals, Rocks, and Stratigrapkical Series Free Post Free. 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Coxway The Transcaspian Territory. -Forests in Russian Turkestan.-Captain the Distribution of Races, &c., &c. W. M. CONWAY. London: EDWARD STANFORD. Price 25. TUESDAY, FEBRUARY 14. OTHER NATURAL HISTORY SPECIMENS. at his Great Rooms, 38 King Street, Covent Garden, W.C., on Heads and Horns of Animals, Cabinets, Birds' Eggs, &c., &c. to view Day prior from 10 till 4 and Morning of Sale, and Catalogues had. CONCHOLOGY. Just Published. Post free, 6d. CATALOGUE, No. 118. Including Sir G. B. AIRY'S Library. Part I. Transactions of Scientific H. F. has just acquired the grand Societies, Periodicals and Serials, Government ReCollection of LAND and FRESH. ports, History of Science. WATER SHELLS formed by the I FOR SALE: FINE COPIES, late Mr ARTHUR. MORELET WILSON (0. S.). THE LARVÆ OF THE BRITISH LEPIDOPTERA AND THEIR FOOD-PLANTS, with Life-sized Figures, drawn and probably the largest Collection ever Coloured from Nature. 367 pp. and 40 Plates, Coloured Figures of 415 Species, with the Plants on which they feed, and 73 Coloured formed by an Amateur, comprising Figures of Varieties. Imperial 8vo, Half Morocco, 1880, £5. HERRICH-SCHAEFFER (C. A. W.). SYSTEMATISCHE BEARBEITUNG nearly 10,000 SPECIES. DER SCHMEITERLINGE VON EUROPA. 636 Plates, Original ITKA FULTONI, Colouring, and 36 Plain Plates. 6 Vols. Text, and 's Vols. Plates, in E. Smith. Vols. 4to, New Half Calf, 1843-56, £45. 28 ESSEX STREET, STRAND, LONDON. HUGH FULTON (Conchologist), ON SALE BY 216 KING'S ROAD, LONDON, S.W. GLASS-TOPPED BOXES, CARD TRAYS, &c. EW MACMILLAN & BOWES, ZOOLOGICAL MICROSCOPICAL SLIDES. CAMBRIDGE, COMPTES RENDUS HEBDOMADAIRES DES PONGES : | ANNELIDA : Heteronereis form of N. Vail SÉANCES DE L'ACADÉMIE DES SCIENCES. 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It contains valuable Courses. mathematical questions and solutions, the republication of which, in book form, did not commence until 1864. Pages 25 to 48 of Vol. 4, and the Title SINEL & HORNELL, Biological Laboratory, Jersey. and Contents of Vol. 40 are wanting ; otherwise it is perfect. : H. BUTLER, M.A. Oxon., Assoc.R.S. Mines. NATURAL HISTORY AGENCY, When this Ink is used writing 158 BROMPTON ROAD, LONDON. becomes a pleasure. lealer in Rocks, Minerals, Fossils, and other objects of Scientific Interest. INK May be had from all Stationers. Now On View:-A large and varied assortment of Rock-specimens re. atly obtained from West Shropshire and North Wales, including numerous abases, variegated Volcanic Ash, Agglomerate, and Breccia, Quartzite In Jars, bd., 1s., & 2s. each. in the Stiper Stones, Spoued Schists, and Granitite; also, a Collection of Can be obtained in London, through Messrs. 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