MINERALOGY, GEOLOGY & PETROLOGY. Single Specimens and Collections for Prospectors, Teachers and Students. Rock Sections, Well-cut. Fossils from all Formations. Metallic Ores from all Parts. Minerals for Chemical Purposes. LISTS FREE from JAMES R. GREGORY & CO., Mineralogists, 139 FULHAM ROAD, SOUTH KENSINGTON, S.W. Telephone No. 2841 Western. Tel. Add., "Meteorites." London. LIVING SPECIMENS FOR THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price 15. 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, Alcyonium; 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. THE DIRECTOR. WATKINS & DONCASTER, Naturalists and Manufacturers of CABINETS AND APPARATUS FOR ENTOMOLOGY. BIRDS' EGGS AND SKINS, AND ALL SPECIAL SHOW-ROOM FOR CABINETS. 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.) CATALOGUE (102 pp.) POST FREE. Sales by Auction. SALES OF MISCELLANEOUS PROPERTY. MR. J. C. STEVENS begs to announce that SALES are held EVERY FRIDAY, at his Rooms, 38 King Street, Covent Garden, London, WC, for the disposal of MICRO SCOPES, SLIDES, and OBJECTIVES-Telescopes-TheodolitesI evels-Electrical and Scientific Instruments-Cameras, Lenses, and all kinds of Photographic Apparatus-Optical Lanterns with Slides and all Accessories in great variety by Best Makers-Household Furniture-Jewellery-and other Miscellaneous Property. On view Thursday 1.30 to 5.30 and morning of Sale. Minerals, Rocks, Fossils, Metallic Ores, Rough Precious Stones, &c. A Large Assortment from all parts of the world always on view, and a all prices. Inspection invited. Crude Mineral for Chemistry Students and Technical Schools. Single Crystals and Teaching Specimens in Great Variety. RICHARDS' SHOW ROOMS, 3 Beauchamp Place, Brompton Road, South Kensington. London, S. W. Collections of British and Foreign MINERALS, ROCKS, FOSSILS. 25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/-. Inspection invited of a large stock of Minerals, Rocks, Fossils, and THOMAS D. RUSSELL, 11 John St., Bedford Row, London, W.C. 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. Telephone-Gerrard, 8830. S. d. 1 10 6 0 15 6 8 (A charge of 6d. is made for changing Scotch and Irish Cheques.) 2900 Cloth Cases for binding "Nature" are issued at 1s. 6d. each, and can be sent post free for 1s. 9d. Cheques and Money Orders should be made payable to MACMILLAN & CO., Limited. 57556 00000 LEITZ PRISM BINOCULARS J. H. STEWARD'S In a VARIETY OF MODELS for TRAVEL, SPORT, MILITARY, MARINE, and OPERA USES, NATURAL HISTORY and ASTRONOMICAL OBSERVATIONS. Unsurpassed for clearness and defining power. The Prisms are absolutely protected from deposits of dust and vapour, and are warranted to stand climatic influences. Descriptive Price List on request. E. LEITZ, 9 OXFORD HOUSE, from £4 4 0 to £12 12 O Illustrated Catalogue, Part II, Post Free. J. H. STEWARD, W. Watson & Sons' Microscopes. An inexpensive instrument with inclining joint, fitting in a socket in side of its case or to fit into a bench. Price of Instrument with socket... £1 00 Instrument with 1 Eyepiece, combining Objective 2" & " ... £2 3 6 Oak Case, extra WATSON'S UNRIVALLED 7s. 6d. MICRO-OBJECTIVES For the work of the Laboratory, the 1/6 in. (4 mm.) and 1/12 in. (2 mm.) Oil Immersion are unexcelled. The 1/6 in. has the ENORMOUS WORKING DISTANCE of one millimetre; specimens with thick covers can be freely examined. The 1/12 in. is the newly computed Objective that Dr. Spitta, in "Microscopy," refers to as "rivalling, in fact, the performance of several apochromats." Where once these Objectives have been used they have been adopted entirely. Add them to your equipment ! Prices-1/12 in. Oil Imm., 1'30 N.A., £5; 1/12 do., 1'20-1'25 N.A., £4. These are of identical construction. 1/6 in., 74 N. ., £1 10s. Full particulars of all the above are contained in Watson's Catalogue No. 2, post free on request. 313 HIGH HOLBORN, LONDON, ENGLAND, & 16 FORREST ROAD, EDINBURGH. FOR HAND THE CORRESPONDENTS' CAMERA. OR TRIPOD Originally made for the use of Newspaper Men in South Africa, and since used all over the World. THIS Camera has been designed for the use of correspondents, artists, and other travellers who, while requiring a Camera possessing the greatest stability, cannot spare the space for a regular field camera in addition to a hand camera. It is made o. the best mahogany, carefully finished and covered with hard morocco leather, or polished in natural colour or ebonised at the same price. It is admirably adapted for Telephoto work. Owing to the use of wood instead of metal, wherever possible, this camera is lighter than many of less substantial make. EACH SIZE PERMITS OF THE USE OF THE SINGLE COMPONENTS OF A STIGMATIC OR OTHER CONVERTIBLE LENS. PRICE, including 3 Double Slides, but f 41 by 31. 5 by 4. 64 by 41. £6 10s. Od. £7 15s. Od. without Lens or Shutter. £5 15s. 6d. J. H. DALLMEYER, Ltd., DENZIL ROAD, NEASDEN, LONDON, N.W. 2 GRAND PRIZES (Highest Awards) FRANCO-BRITISH EXHIBITION. Show Rooms: 25 NEWMAN STREET, W. MAKERS OF THE CELEBRATED DALLMEYER PORTRAIT LENSES. Printed by RICHARD CLAY & SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, July 1, 1909. Full particulars on application to the Sole Makers NEGRETTI & ZAMBRA, 38 Holborn Viaduct, E.C., -London. Branches: 45 CORNHILL, E.C. ENGINEERING MUNICIPAL ENGINEERING MUNICIPAL ELECTRI. { W. PERROTT, M.A.I., WEMYSS ANDERSON, M.Eng., M. Inst.C.E., M.I. Mech. E. Professor F. S. CAREY, M.A. (Lyon Jones Professor-L. R. WILEER. FORCE, M.A. Grant Professor-J. CAMPBELL BROWN D.Sc., LL.D. (Associate Professor-J. A. F. ASPINALL M.Eng., M. Inst.C.E., M.I. Mech. E. Associate Professor-J. A. BRODIE, {Ascing., M. Ift.C.E., M.1.Mech. E. Associate Professor A. BROMLEY HOLMES, M.Eng., M. Inst.C.E., CAL ENGINEERING...M.I.E.E. The Courses of Study in the Faculty leading to the ordinary degree of Bachelor of Engineering extend over at least three years. They are so arranged as to afford a general scientific training for those who intend, with or without graduating, to become engineers or naval architects, or to enter any allied profession. Students who do not proceed to a University degree may take a course of not less than two years leading to a Certificate in Engineering. The Honours Course enables students to specialise in some branch of the profession, and opportunities are afforded for post-graduate work and research. The special Prospectus of the Faculty may be obtained on application to the undersigned. P. HEBBLETHWAITE, M.A., Registrar. THE DAVY-FARADAY OF THE ROYAL INSTITUTION. DIRECTOR: Professor Sir JAMES DEWAR, M.A., LL.D., D.Sc., F. R.S. SUPERINTENDENT OF THE LABORATORY: DR. ALEXANDER SCOTT, M.A., D.Sc., F.R.S. This Laboratory was founded by Dr. Ludwig Mond, F.R.S., as a Memorial of Davy and Faraday, for the purpose of promoting, by original research, the development and extension of Chemical and Physical Science. Michaelmas Term.-Monday, October 4, to Saturday, December 11. Full Information and Forms of Application can be had from the ASSISTANT SECRETARY, Royal Institution, Albemarle Street, W. To prevent delay Candidates ought to send in their applications for admission during the course of the Term preceding that in which they wish to enter. COUNTY COUNCIL OF THE WEST RIDING OF YORKSHIRE. EDUCATION DEPARTMENT. ELLAND SECONDARY SCHOOL (GIRLS). The West Riding Education Committee will require for the above school for September next, the services of an ASSISTANT MISTRESS to take chiefly Science, Mathematics and Physical Geography (ability to teach Domestic Subjects will be an additional qualification). Commencing salary, £120 per annum. Forms of application may be obtained from the Education Department (Secondary Branch), County Hall, Wakefield, and should be returned, with copies of not more than three recent testimonials, not later than July 19 next. Canvassing will be a disqualification. HOLLOWAY, LONDON, N. Close to Holloway Stn. (G.N.R.), Highbury Stn. (N.L.R.), Holloway Rd. Stn. (B. & P. Tube), & Highbury Stn. (G. N. Tube), LONDON UNIVERSITY SCIENCE AND ENGINEERING DEGREES. Day and Evening Courses in the above under recognised teachers inMATHEMATICS, BOTANY, PHYSICS, CHEMISTRY, GEOLOGY, ENGINEERING. Separate Laboratories for Elementary, Advanced and Honours students exceptionally large and well equipped. RESEARCH. Special arrangements for students undertaking research during vacations. Full particulars at the Institute or sent on receipt of postcard. REG. S. CLAY, D.Sc., Principal. NEW SESSION COMMENCES SEPTEMBER 27. MILE END ROAD, E. The College is situated close to stations on the G. E.R., District Railway and L.T. and Southend Railway, and is approached from The Roya Exchange in 15 minutes by motor omnibus. PASS AND HONOURS COURSES in the FACULTIES OF ARTS, SCIENCE AND ENGINEERING. Latin, Greek, English, French, German, English History, Logic, Mathematics, Physics, Chemistry, Botany, Geology. CIVIL AND MECHANICAL ENGINEERING. ELECTRICAL ENGINEERING. Courses in the above subjects are likewise arranged for Evening Students. PREPARATORY AND MATRICULATION CLASSES. MODERATE FEES. Valuable Scholarships are offered annually by the Worshipful Company of Drapers. Calendar post free on application to the REGISTRAR, or J. L. S. HATTON, M.A., Principal SOUTH-WESTERN POLYTECHNIC INSTITUTE, MANRESA ROAD, CHELSEA, S.W. Day Courses in preparation for London University degrees in Mechanical and Electrical Engineering, in Chemistry, Physics and Natural Science. Session Fee, £15. Similar Evening Courses. Session Fee, £2. Technical Day Courses arranged to extend over 3 years and prepare for Engineering, Electrical, Chemical and Metallurgical professions. Mathematics *A. J. MAKOWER, M.A.; *B. H. MORPHY and Ú. A. OSCHWALD, B.A. * Recognised Teacher of the University of London. Full prospectus from the SECRETARY, post free, 4d.; at the Office. price 1d. SIDNEY SKINNER, M.A., Principal. BATTERSEA POLYTECHNIC. Full Day and Evening Courses, extending over three or more years, for J. WILSON, M.Sc.; J. L. WHite, D.Sc. (W. E. M. CURNOCK, M.SC., B.Eng. J. B. SHAW, A.R.C.S., Wh. Ex.; R. W. A. W. ASHTON, M.Sc.; A. T. Dover. J. H. JOHNSTON, M.Sc., F.I.C. *Students attending in these subjects may register as internal students of London University. Classes are provided in Latin, French, German, Spanish, Italian; in Com mercial Subjects and Commercial Law; in Sanitary Science, Bacteriological Chemistry, &c. There are completely equipped Departments in Domestic Economy, Art and Crafts, and Music. Scholarships to the value of £ are awarded annually. Special facilities are afforded for research work. For prospectus and further particulars apply to the SECRETARY. 土 The Agent-General for Victoria, Australia, is authorised to receive at his offices at Melbourne Place, Strand, London, W.C., applications for appointment to the Chair of Engineer. ing at the Melbourne University, which is now vacant. Salary, £1000 per annum. THE CLINICAL SCHOOL, THE JOURNAL OF ECONOMIC BIOLOGY. Edited by WALTER E. COLLINGE, M.Sc., F.L.S., F.E.S., with the co-operation of Prof. A. H. REGINALD BULLER, D.Sc., Ph.D.; Prof. PERCY GROOM, M. A. (Cantab. & Oxon.), D.Sc., F.L.S.; and A. E. Shipley, M.A., Hon. D.Sc., F.R.S. Vol. IV., Parts 1 and 2, now ready. Descriptions and Life-histories of Two New Parasites of the Black Currant-Mite. (With Plts. i. and ii. and 5 Text-figs.) By ADelaide M. TAYLOR.-Descriptions of Two New Species of Collembola. (With Plt. iii.) By WALTER E. COLLINGE, M.Sc., F.L.S., and JOHN W. SHOEBOTHAM, N.D.A.-Observations on the Life-history and Habits of Thereva nobilitata, Fabr., and other species. (With Plt. iv.) By WALTER E. COLLINGE, M.Sc., F.L.S.-Note re Rat Parasites. By A. E. SHIPLEY, M.A., F.R.S.-A Contribution to our Knowledge of the British Thysanoptera, with Notes on Injurious Species. By RICHARD S. BAGNALL, F.E.S.-A Stem Boring Beetle attacking Cotton in the Sudan. (With Plt. v.) By HAROLD H. KING.-Description of a New Genus of Collembola of the Family Neelidae, Folsom. (With Plt. vi.) By WALTER E. COLLINGE, M.Sc., F.L.S., and JOHN W. SHOEBOTHAM.— Reviews. Current Literature. Prepaid Annual Subscription to Vol. IV. (4 parts), 16s. A few complete sets of Vols. I.-III. are still obtainable, price 21s. each. LONDON: DULAU & CO., 37 SOHO SQUARE, W. BROWNING'S UNIVERSITY OF LIVERPOOL. TOURIST & DEER-STALKING Clinical teaching in the University is carried on in four General Hospitals and five Special Hospitals. The Hospitals contain a total of 1050 beds; 800 of these are in the General Hospitals, 250 in the Special Hospitals. Twenty-six Resident Appointments, fourteen carrying salaries from £60 to £100 per annum, are open to students of the School. Further information may be obtained on application to the Secretary, Professor ABRAM, 74 Rodney St., Liverpool. GUY'S HOSPITAL. ENTRANCE SCHOLARSHIPS, to be competed for in September, 1909. TWO OPEN SCHOLARSHIPS in ARTS, one of the value of £100, open to Candidates under 20 years of age, and one of £50, open to Candidates under 25 years of age. TWO OPEN SCHOLARSHIPS in SCIENCE, one of the value of £150, and another of £60, open to Candidates under 25 years of age. ONE OPEN SCHOLARSHIP for University Students who have com. pleted their Study of Anatomy and Physiology, of the value of £50. Full particulars may be obtained on application to the DEAN, Guy's Hospital, London Bridge, S. E. UNIVERSITY OF MANCHESTER AND MANCHESTER ROYAL INFIRMARY. ENTRANCE MEDICAL SCHOLARSHIPS. Two Scholarships are offered and will be awarded to candidates who give evidence of a high standard of proficiency in Arts or Science respectively. Each Scholarship is of the value of £100, and the successful candidates will be required to enter for the full Medical Curriculum in the University and the Infirmary. Applications should be sent on or before July 15 to the REGISTRAR, from whom further particulars may be obtained. TELESCOPES |
