A Large Collection of Beautiful Mineral Specimens, including a VERY FINE GROUP OF SENARMONTITE CRYSTALS, VERY BRILLIANT MANGANITES, WULFENITES. VANADÍMITES, HARMATOME, from Oberstein and Scotland; NATROLITES, Auvergne ; CHILDRENITES, ARAGONITES, and MELANOPHLOĠITE. FOSSILS, ROCKS, ROCK SECTIONS, HAMMERS, CHISELS, and BLOWPIPE APPARATUS. Precious Stones for Collectors and Mounting. COLLECTIONS FOR STUDENTS AND PROSPECTORS. Lessons given. Catalogues Free. 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, Begs to announce that he has REMOVED his extensive Collections to more Commodious Premises at the above Address, and has thus secured greatly increased facilities for the execution of Orders. A Large Assortment of Hammers of New Pattern, for all classes of Rock-collectors, has just been added to Stock, also a fresh Series of Microsections illustrative of Teall's "British Petrography." MINERALOGY AND GEOLOGY. SPECIAL AND TYPICAL COLLECTIONS FOR STUDENTS, LECTURERS, AND MUSEUMS. EVERY REQUISITE FOR PRACTICAL WORK, CABINETS. CASES, APPARATUS OF ALL KINDS. The Largest Stock in England of Rocks, Rock-Sections, Minerals, Fossils. New Catalogues and Lists now ready, Free, of JAMES R. GREGORY, 88 CHARLOTTE STREET, FITZROY SQUARE, LONDON. Comprising Fossils, Minerals, and Rocks, labelled with Name, Locality and Geological Position, in Mahogany Cabinets. 100 Specimens, 255.; 200 ditto, 50s. The best value obtainable. Micro-sections of Rocks in great variety. Cabinets, Glass-topped Boxes, and other Geological Requisites. THOMAS D. RUSSELL, PRIZE MEDALLIST, HEALTH EXHIBITION, J. T. CROCKETT, Maker of every description of Entomological Cabinets and Apparatus ; Store- and Book-boxes, fitted with Camphor-cells; Setting Boards, Oval or Flat, &c. Cabinets of every description kept in stock. SPECIAL INSECT CABINETS, with Drawers fitted with Glass Tops and Bottoms to show upper and under side without removing insect. Store-boxes specially made for Continental Setting, highly recommended for Beetles. All best work. Lowest possible terms for cash. Prices on Application. Estimates supplied. Trade supplied. Established since 1847. Show Rooms-7A Prince's Street, Cavendish Square, W. (7 doors from Oxford Circus). Factories-34 Ridinghouse Street, and Ogle Street, W. 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. being the Account of a Rough Survey in the Rocky Mountain Region of British Columbia. By WILLIAM SPOTSWOOD REEN, M.L FR.G., A.C., Author of "The High Alps of New Zealand." "Crost 8vo. 78. 6d, ORGANIC EVOLUTION as the RESULT of the INHERITANCE of ACQUIRED CHARACTERS ACCORD ING to the LAWS of ORGANIC GROWTH. By Dr. G. H THEODOR EIMER, Professor of Zoology and Comparative Ana tomy in Tübingen. Tran lated by J. T. CUNNINGHAM, M.A., F.K.S.E., late Fellow of University College, Oxford. 8vo, 125, 6, SCIENTIFIC LECTURES. By Sir John LUBBOCK, F.R.S., D.C.L., LL.D., &c. Second Edition, Revised and Enlarged. 8vo, 8s. 6d. THE THEORY OF DETERMINANTS, in the HISTORICAL ORDER of its DEVELOPMENT. Part 1. Determinants in General; Leibnitz, 1693, to Cayley, 1941 B. THOMAS MUIR, M.A., LL.D, F.R.S.E., Author of A Theory Determinants," &c. Svo, 10s, bl. FOUR FIGURE MATHEMATICAL TABLES. Comprising Logarithmic and Trigonometrical Tables, and Tables of Squares, Square Roots, and Reciprocals. By J. 1 EOT TOMLEV, M.A., F.R.S.E., F.C.S., Lecturer in Natural Philosoph in the University of Glasgow. Second Edition, Enlar、ed. BYO, 15. ft. MACMILLAN AND CO., LONDON. TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LANTERN, used by W. LANT CARPENTER, Esq., Prof. FORBES, B. J. MALDEN, Esq. New Oxyhydrogen Microscope. Grand Results. Docwra Triple, Prize Medal, Highest Award. 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. REMEDY For BAD LEGS, BAD BREASTS, OLD WOUNDS, SORES and MANUSCRIPT COPYING By Typewriter. Special attention given to Papers on Technical Subjects for Public Reading. Price, 1s. 3d. per 1000 Words. Manifold Copies, 1s. per 1000 Words. STANDARD TYPEWRITING CO., 90 & 91 Queen St. (third floor), E.C. and at 38 Arlington Square, N., and 41 Goldney Road, W. Waltham Bros, Brewers. London.S.W. WIMSHURST MACHINE. Works in any Weather. Size giving 4 Sparks, £4 10s. HARVEY & PEAK, 6 CHARING CROSS ROAD, W.C. PERKEN, SON, & RAYMENT, MANUFACTURE PHOTOGRAPHIC APPARATUS Of every description. "OPTIMUS" PHOTOCRAPHIC SETS" OPTIMUS" MACAZINE CAMERA "OPTIMUS" PHOTOGRAPHIC LENSES W. WATSON & SONS. Awarded 20 GOLD AND OTHER MEDALS at various International Exhibitions, including 2 GOLD MEDALS Paris Exhibition, 1890, for Microscopes, &c. Very beautiful Group of Eggs of Butterflies, Moths, &c.-Opaque ... Distillation from Vapour of Coke-for Polariscope s. d. Trans. Section of Tentacle of Sea Anemone, showing Thread Cells, &c. 1 ducts, Uterus, Muscle, &c. Amphioxus-Trans. Section through Pharynx Phantom Shrimp (Caprella linearis) 6 www 10 6 1Ο 6 ... 18 6 Kidney of Snail-Typical Crustacean Sponge Spicules from Jeremie, in Group-very curious.. Pediculus capitis, Male, Female, Egg, and Larva-on One Slide Any of the above forwarded on receipt of Remittance for Price. CLASSIFIED LIST OF 40,000 FIRST-CLASS OBJECTS forwarded Post free on application toW. WATSON & SONS, OPTICIANS TO HER MAJESTY'S GOVERNMENT, 313 HIGH HOLBORN, LONDON, W.C. AND 251 SWANSTON STREET, MELBOURNE, AUSTRALIA. ESTABLISHED 1837. TO H.R.H. THE PRINCE OF WALES, THE EMPRESS OF GERMANY, &c A WORD TO BUSINESS MEN. You cannot afford to do your writing in the old way. The work of our machines is plain and business-like, obviating all mistakes in reading. Several copies can be made at one writing by the use of carbon paper. Excellent letterpress copies can be taken. Our improved machine has been adopted in all the Departments of the Government Service, and is being very generally introduced by all leading business houses. Does not this argue that the Typewriter should be worth something to you? The Machines can be furnished with special key-boards to suit any purchaser's line of business. 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 the Office, 29 and 30 Pedf rd Street, Covent Garden.-THURSDAY, Apr 13. 1890 Registered as a Newspaper at the General Post Office.] NEWTON'S PATENT [PRICE SIXPENCE. [All Rights are Reserved. Scientist's Biunial Lantern, NALDER BROS. & CO. Oxford and London University NEWTON & CO., Opticians to the Queen and 3 FLEET STREET, LONDON. THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, NEGRETTI & ZAMBRA'S ST. TIBB'S ROW, CAMBRIDGE. MAKERS OF PHYSICAL, PHYSIOLOGICAL, BOTANICAL, AND Drawings made on Stone and Wood, and the most refined work in Lithography Sole Authorized Makers of PROF. EWING'S SEISMOMETRIC APPARATUS. Now Ready, Vol. XI., No. 3. Price to Subscribers 215. per Volume, post free. THE JOURNAL OF PHYSIOLOGY. SPECTACLES. WITH FINEST BRAZILIAN PEBBLES, NEGRETTI AND ZAMBRA make a Speciality of Spectacles for 38 HOLBORN VIADUCT, E.C. THE LONDON HOSPITAL MEDICAL LIVING SPECIMENS FOR THE MICROSCOPE. COLLEGE. The SUMMER SESSION will commence on THURSDAY, MAY 1. The Hospital, which is the largest general Hospital in the Kingdom, con. tains nearly 800 beds. all in constant use. There are wards for accidents, surgical and medical cases, diseases of women and children, and ophthalmic cases. Special departments for diseases of the eye, ear, throat, skin, and teeth, and for cancer, tumours, diseases of the bladder, piles, and fistula. Number of in-patients last year, 8873; out-patients, to1,548; accidents, 7456. Surgical operations daily. APPOINTMENTS.-Resident Accoucheur, House Physicians, House Surgeons, &c. Forty of these Appointments are made Annually. Numerous Dressers, Clinical Clerks, Post-mortem Clerks, and Maternity Assistants are appointed every Three Months All Appointments are Free. Holders of Resident Appointments are also provided Free Board. The New College Buildings are now complete, and afford more than double the former accommodation SCHOLARSHIPS AND PRIZES.-Twenty Scholarships and Prizes are given annually. Students entering in May are eligible to compete for the four Entrance Scholarships in September. Luncheons or Dinners, at Moderate Charges, can be obtained in the Students' Club. N B.-Special arrangements have been made to meet the requirements of the Examining Board .n England so as to enable Students entering in May to pass Part I. (Chemistry and Chem cal Physics), and Part II. (Materia Medica and Pharmacy) of the First Examination in July. The London Hospital is now in direct communication with all parts of the Metropolis. The Metropolitan District and other Railways have Stations within a Minute's Walk of the Hospital and College. For further Information apply Personally or by Letter to MUNRO SCOTT, Warden. ROYAL INSTITUTION OF GREAT BRITAIN, ALBEMARLE STREET, PICCADILLY, W. Tuesday Next (April 15). at 3 o'clock-The HON. GEORGE C. BRODERICK, D.C.L.: First of Three Lectures on The Place of Oxford Univers.ty in English History." Half-a-Guinea the Course. Thursday (April 17). at 3 o'clock -Prof. C. V. Boys, F.R.S.: First of Three Lectures on "The Heat of the Moon and Stars." Half-a-Guinea. Saturday (April 19) at 3 o'clock-CAPTAIN W. DE W. ABNEY, R.E., C.B.. F.R S. First of Three Lectures on "Colour and its Chemical Action." Half a-Guinea. Subscription to all the Courses in the Season, Two Guineas. The Friday Evening Meetings will be resumed on April 18, when SIR FREDERICK BRAMWELL, Bart., F. R.S., will give a Discourse on Welding by Electricity," at 9 o'clock. To these Meetings Members and their Frien is only are admitted. ST. THOMAS'S HOSPITAL MEDICAL SCHOOL, ALBERT EMBANKMENT, LONDON, S.E. Students enter The SUMMER SESSION will commence on MAY 1. ing in the Summer are eligible to compete for the Science Scholarships of 125 Guineas and £60 awarded in October. There are numerous Prizes and Scholarships, and all Appointments are open to Students, without extra charge. Special Classes for the Examinations of the University of London are held throughout the year. A Register of approved lodgings, and of private families receiving Students to reside, is kept in the Secretary's Office. Prospectus and all particulars may be obtained from the Medical Secretary, Mr. G. RENDLE. E. NETTLESHIP, Dean. LEEDS MECHANICS' INSTITUTION AND LITERARY SOCIETY. The Directors invite applications for the post of HEAD MASTER of the SCHOOL OF SCIENCE AND TECHNOLOGY and TEACHER OF CHEMISTRY to the Boys' and Girls' Schools in connection with the Institution, the present Head Master having been elected to the Head Mastership of the Merchant Venturers' School, Bristol. The Master appointed will be expected to take the classes in Theoretical and Practical Inorganic and Organic Chemistry, and to exercise a general supervision over the other classes of the School of Science. The School buildings are new, and furnished with all necessary materials and apparatus for science teaching. Salary, partly fixed and partly dependent upon results, amounts to about £280. Full part.culars may be had from the SECRETARY, to whom applications must be sent not later than April 23. LONDON GEOLOGICAL FIELD CLASS, 1890. Directed by Prof. H. G. SEELEY, F.R.S. The Excursions of this Section of the Society are arranged for the Practical Study of Geography. Its method is to visit Types of Rivers, Valleys, Hills, and Hill Ranges on Saturday Afternoons; to observe the Characteristics of these phys.cal features of the Country, and to Study the Conditions which have produced them. First Excursion APRIL 12, 1890. For Particulars, apply to JOHN KIDD, 74 Brighton Road, SouthHornsey, N. N.B. As there are only a few Vacancies to be filled up, early application is requested. GOLD MEDAL awarded at the FISHERIES EXHIBITION 15 THOMAS BOLTON, 83 CAMden Street, Birmingham, Who last week sent to his subscribers Paludicella Ehrenbergi, with sketch and description. He also sent out Lophopus crystallinus, Argulus foliacens, Corethra, Trout Ova, Philodina roseola, Floscularia. Corethra plamicornis, Melicerta ringens, Stephanoceros; also Amoeba, Hydra, Vorticella, Crayfish Dog Fish. Amphioxus, and other Specimens for Biological Laboratory work. Weekly Announcements will be made in this place of organisms T. B. is supplying. Specimen Tube, One Shilling, post free. Twenty-six Tubes in Course of Six Months for Subscription of £3 14., or Twelve Tubes for ios. 6d Portfolio of Drawings, Eleven Parts, 1s. each. UNIVERSITY COLLEGE, LONDON. FACULTY OF MEDICINE. The Classes re-commence on MAY 1, and are so arranged as to afford a convenient opportunity for Students to commence their Medical Course. Full information may be obtained from the Office of the College, Gower Street, W.C. JOHN WILLIAMS. M.D., Dean J. M. HORSBURGH, M.A., Secretary. BIOLOGY (Zoology and Botany). Courses adapted to the requirements of Candidates for the Preliminary Scientific Examination of the University of London under the direction of Prof. KAY LANKESTER and Prof. OLIVER commence on APRIL 15. Students can enter as late as MAY 1. Apply to the SECRETARY or to Prof. LANKESTER at University College, London, Gower Street, W. C. E. RAY LANKESTER, M. A., LL.D., F.R.S., Dean. J. M HORSBURGH, M.A, Secretary. CAVENDISH COLLEGE, CAMBRIDGE. An EXAMINATION will be held on TUESDAY, July 8, and following days, for One Scholarship of £50 and Six Scholarships of £30 a Year, open to Students under 18 Years on October 1, 1890. Candidates may offer ate or more of the following Subjects: Classics, Mathematics. Natural Science, Modern Languages. The College Fee for Board, Lodging, and Tuition is £25 for each of the Three University Terms, and 15 for Residence in the Long Vacacion For further information apply to the MASTER. Two OPEN SCHOLARSHIPS in Classics, Mathematics, and Modern Languages: one of the value of 100 Guineas, open to Candidates under za Years of Age, and one of 50 Guineas open to Candidates under 25 Years of Age. Two OPEN SCHOLARSHIPS in Chemistry, Physics, and Biolegy : one of the value of 125 Guineas and another of 50 Guineas, open to Cand dates under 25 Years of Age. For further particulars, apply to the DEAN, Guy's Hospital, S. E. GUY'S HOSPITAL MEDICAL SCHOOL. UNIVERSITY OF LONDON PRELIMINARY SCIENTIFIC M.B. EXAMINATION. Instruction is given in all the subjects of the above Examination at GUY'S HOSPITAL during the Winter and Summer Sessions. The Fes for the whole Course is Ten Guineas. The Class is not confined to Students of the Hospital. For further particulars, apply to the DEAN, Guy's Hospital, Southwark, S.E. VICTORIA UNIVERSITY. THE YORKSHIRE COLLEGE, LEEDS. THE AGRICULTURAL COLLEGE, PRINCIPAL-DR. H. J. WEBB, B.SC. Thorough practical and scientific Training in Agriculture. Preparation for the Colonies. Students gained the First. Third, and Fourth Scholar ships of the Royal Agricultural Society, 1888. TO SCIENCE LECTURERS. See Mr. HUGHES'S PATENT COMBINATION OPTICAL LAN TERN, used by W. LANT CARPENTER, Esq., Prof. FORBES, B. J. MALDEN, Esq. New Oxyhydrogen Microscope. Grand Results. Docura Triple, Prize Medal, Highest Award. Patent Pamphagos Lantern Science Lecture Sets. Novelties Cheapest and Best. Elaborately Illustrated Catalogue. 300 Pages, 1s. Postage, 5d. Smaller do., 6d. Pamphlets Free. HUGHES, Specialist, Brewster House, Mortimer Road, Kingsland, N. |