Sale by Auction. SHELLS. MONDAY, FEBRUARY 13, AT 12.30. MR. J. C. STEVENS will Sell by Auction, at his Rooms, 38 King Street, Covent Garden, London, W.C., the remaining portion of the large and important Collection of Shells formed by Dr. JAMES C. Cox, of Sydney, author of "Monograph of Australian Land Shells." Full particulars in catalogues, which may be had on application. MICROLOCICAL LABORATORY AND SCHOOL OF NATURAL SCIENCE. GRATIS AND POST FREE. Scientifically arranged Catalogue of Megascopic and Microscopic Specimens is now being prepared. Gentlemen are invited to send in their applications without delay, as only 5000 copies will be issued. Sample Slide of expertly prepared ROCK SECTION, 1/-, post free. Metals, Minerals and Rocks expertly mounted for Microscope, 1/- each, from material supplied. LESSONS IN PRACTICAL LITHOLOGY BY CORRESPONDENCE. A vacancy for one Geological Studen', desirous of passing with high distinction in University or Civil Service. Small premium. Pocket-money allowed. Apply:- THE DIRECTOR, MICROLOGICAL LABORATORY, 11 ASPENLEA ROAD, HAMMERSMITH, LONDON, W. LIVING SPECIMENS FOR Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM. THE LABORATORY, PLYMOUTH. The following animals can always be supplied, either living or preserved by the best methods : Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy. onium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus. Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c. For prices and more detailed lists apply to Biological Laboratory, Plymouth. PHENIX THE DIRECTOR. WATKINS & DONCASTER, Naturalists and Manufacturers of CABINETS AND APPARATUS FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL SPECIAL SHOW-ROOM FOR CABINETS. N. B. For Excellence and Superiority of Cabinets and Apparatus, references are permitted to distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, BIRDS' EGGS AND SKINS. SPECIALITY.-Objects for Nature Study, Drawing Classes, &c. Birds, Mammals, &c., Preserved and Mounted by First-class Workmen true to Nature. All Books and Publications on Natural History supplied. 36 STRAND, LONDON, W.C. (Five Doors from Charing Cross.) Our Catalogue (96 pp.) Post free on application. Special display for Teachers and Students on Saturdays. Open till 7 p.m. RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington, London, S. W. ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES. 25 Specimens, 5/6; 50 do., 10/6; 1oo do., 21/-; 200 do., 42/20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy. A large stock of Minerals, Rocks, Fossils and Microscopic Objects for NEW CATALOGUE POST FREE. THOMAS D. RUSSELL, 78 Newgate St., London, E. C. MICROSCOPICAL PETROGRAPHY. Gentlemen interested in the above study are invited to send to THE TWENTIETH CENTURY ATLAS OF now being issued in Twelve Monthly Parts, each Part containing Four Fine Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s. NOTICE.-Advertisements and business letters for NATURE should be addressed to the Publishers; Editorial Communications to the Editor. The telegraphic address of NATURE is " PHUSIS," LONDON. Applications invited for its receipt post free on publication. As convenient as switching on the Electric Light. ISENTHAL & CO., TOWNSON 85 MORTIMER STREET, LONDON, W. Contractors to the Admiralty, War, India, & Colonial Offices. &c. LATEST IMPROVED FORM 34 CAMOMILE STREET, E.C. THE STEREOSCOPIC COMPANY'S DOUBLE-SURFACE ARTIST'S Patent applied for. CONDENSER. Overcomes the many disadvantages of TO Answers equally well for distillations with direct steam, ordinary distillations, or under reduced pressure. Easily cleansed by removing inner condensing tube. In case of breakage (chances of which are reduced to a minimum), any part may be readily renewed at very small cost, or, in fact, replaced from the stores of any ordinary laboratory. May be used in any position, with or without vacuum. Takes less than one-third the bench room of an ordinary Liebig type condenser. For distillations under reduced pressure, where fractions have to be separated, the fractionating end (as shown in Fig.) will be found extremely useful and convenient. Condenser, 5/6; Fractionating End, 10/6; SOLE MAKERS C. E. MÜLLER, ORME & CO., Ltd., 148 HIGH HOLBORN, LONDON. THE LONDON STEREOSCOPIC CO The Ideal Camera for BIRD PHOTOGRAPHY, NATURAL THE LONDON STEREOSCOPIC COMPANY, Inted by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 I read Street Hill, Queen Victoria Street, in the City o London, and published by MACMILLA AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, Feb. 9, 1905. Containing an original description of the principles and "PHOTOGRAPHIC LENSES: A SIMPLE TREATISE." By CONRAD BECK and HERBERT ANDREWS. 350 Pages, 45 Engravings, 150 Diagrams, Cloth Bound. R. & J. BECK, Ltd., 68 CORNHILL, LONDON. CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied NEGRETTI & ZAMBRA'S SELF-RECORDING METEOROLOGICAL INSTRUMENTS. THE NEW PATTERN COMBINED BARO-THERMOGRAPH. The above instrument combines in one apparatus the Recording Barometer and Recording Thermometer, giving thus on one and the same chart continuous records of the atmospheric pressure and temperature for seven days. VERY SUITABLE FOR PRESENTATION. Illustrated Price List of Self-Recording Meteorological Instruments, or "Special" Illustrated List of Scientific goods suitable for Presents, Post Free to all parts of the World. 38 HOLBORN VIADUCT, E.C. Branches-45 CORNHILL, and 122 REGENT STREET. UNIVERSITY OF BIRMINGHAM. BIRKBECK COLLEGE. Faculties. SCIENCE, Arts, MEDICINE, COMMERCE. SPECIAL SCHOOL OF MODERN LANGUAGES. ENGINEERING, METALLURGY, MINING, BREWING, DENTISTRY, Leading to Degrees and Diplomas. KEBLE COLLEGE, OXFORD. A SCHOLARSHIP of the annual value of £60, together with Laboratory Fees, not exceeding £20 per annum, will be awarded at this College in March, 1905. The Examination commences Tuesday, March 14. Subjects: Chemistry or Biology, with Elementary Mechanics and Physics for all Candidates, and Elementary Chemistry for those who offer Biology. For full particulars apply to Dr. HATCHETT JACKSON, Keble College, Oxford. THE LISTER INSTITUTE OF JENNER MEMORIAL STUDENTSHIP IN BACTERIOLOGY. The Governing Body offers Research Studentship of the value of £150, tenable by a British subject for one year, but renewable for a second year at the option of the Governing Body. Applications to be sent in by March 18, 1905, to the ASSISTANT SECRETARY. The Lister Institute of Preventive Medicine, Chelsea Gardens, Chelsea Bridge Road, London, S. W. RHODES UNIVERSITY COLLEGE, GRAHAMSTOWN, CAPE OF GOOD HOPE. ESTABLISHED BY ACT OF PARLIAMENT, 1904. *Applications are invited for the following Professorships, viz. :— (1) LATIN and CLASSICAL LITERATURE and PHILOLOGY. Salary, £500 per annum. (2) PHILOSOPHY and HISTORY. Salary, £500 per annum. (3) APPLIED MATHEMATICS and PHYSICS. Salary, £500 per annum. (4) GEOLOGY. Salary, £350 per annum. (5) ZOOLOGY. Salary, £350 per annum. The professors of Geology and Zoology will also hold appointments in connection with the Albany Museum, for which they will receive an additional salary of £150 each per annum. Further particulars may be obtained from the AGENT-GENERAL FOR THE CAPE OF GOOD HOPE, 100 Victoria Street, Westminster, Londor, to whom applications, with copies of testimonials, should be sent on or before March 15, 1905. Applicants must be under 40 years of age, and must furnish a certificate of good health. Successful candidates will be required to enter upon their deties at Grahamstown on July 25, 1905. BREAMS BUILDINGS, CHANCERY LANE, E.C. FACULTY OF SCIENCE. Chemistry Physics.. Mathematics Botany ... Zoology.. J. H. MACKENZIE, Ph.D., D.Sc. 1H. WKEN, Ph.D., B A., B.Sc. ALBENT GRIFFITHS. D.Sc. D. OWEN, B A., B.Sc. B. W CLACK, B.Sc. E. H. SMART, M.A. W. G. BIRT, B.A., B.Sc JA. B. RENDLE, M.A., D.Sc. F. E. FRITSCH, Ph.D., B.Sc. H. W. UNTHANK, B.A., B.Sc. Geology & Mineralogy GEO. F. HARRIS, F.G.S. Assaying, Metallurgy & Mining. GEO. PATCHIN, A.R.S.M. RESEARCH in Chemistry and Physics in well-equipped laboratories. French, German, Spanish, Russian, Dutch, & Italian Classes. EVENING CLASSES also in Biology, Physiology, Practical Geometry, Building and Machine Construction, Steam, Theoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating Calendar 6d. (post free 8d.), on application to the SECRETARY The Gas Committee of the City of Birmingham require the services of a thoroughly trained CHEMIST, qualified to take charge of a new 20 too per diem coal testing plant fitted with regenerative retort settings Applicants must be capable of undertaking the following duties:-The analysis of coal and the by-products of coal, the analysis of furnace gases and the regulating of the gas plant, the manufacture of gas, including purification, analysis and test for illuminating power and of calorific value, the testing of all materials used in manufacture, and also the initiation and conduct of experiment and research work to aid the scientific development of the industry. Applicants are required to furnish particulars of their scholastic attainments in chemistry, state their age and experience, and salary required, and forward their application, addressed to the CHAIRMAN of the Works Sub-Committee of the Gas Department, Council House, Birmingham, on or before February 20 next. Council House, Birmingham, January, 1905. G. HAMPTON BARBER, Secretary. CITY AND GUILDS CENTRAL TECHNICAL COLLEGE, EXHIBITION ROAD. CIVIL AND MECHANICAL ENGINEERING DEPARTMENT An ASSISTANT is required who can teach Mechanical Drawing and Mechanism; applicants should have had some experience in the Drawing Office of a Mechanical Engineering Firm. Apply, sending testimonials with a statement of age and particulars of teaching experience, to Prof. W. E. DALBY. Salary, £150 per annum. MATHEMATICAL DEPARTMENT. An ASSISTANT is required immediately who possesses a sound knowledge of Elementary Mathematics and of the Elements of the Differential and Integral Calculus. Some experience in a Mechanical or a Physical Laboratory and some knowledge of Geometrical Drawing is desirable, but not necessary. Salary, 100 per annum. Apply, sending testimonials and a statement of age, to Prof. O. HENRICI. |