SOUTH-WESTERN POLYTECHNIC, MANRESA ROAD, CHELSEA, S.W. EVENING CLASSES commence SEPTEMBER 24. The Day College Courses consist of 30 hours per week, and are in The Evening Classes consist of similar courses at much reduced rates. The Technical Day Courses are arranged to extend over 3 years and prepare for Engineering, Electrical, Chemical, and Metallurgical professions. J*W. H. ECCLES, D.Sc. Mathematics Physics ... Chemistry Botany Geology Zoology.. Engineering Electrical Engineering *J. LISTER, A.R.C.S. (*S. SKINNER, M.A. *W. H. ECCLES, D.Sc. *L. LOWNDS, B.Sc., Ph.D. (*J. B. COLEMAN, A.R.C.S. *J. C. CROCKER, M.A. *F. H. LOWE, B.Sc. C. W. HALE. W. E. OAKDEN. (*H. B. LACEY. *T. G. HILL, A.R.C.S. *A. J. MASLEN, F. L.S. 'H. B. FANTHAM, B.Sc., A.R.C.S. *W. W. F. PULLEN, A.M.I.C.E., M.I.M. E., Wb.Sc. *A. MACK LOW SMITH. H. AUGHTIE. *A. J. MAKOWER, B.A. U. A. OSCHWALD, B.A. *B. H. MORPHY. TECHNICAL COLLEGE, BRISTOL. PRINCIPAL-Prof. J. WERTHEIMER, B.Sc., B.A., F.I.C., F.C S. ENGINEERING-Prof. J. MUNRO, A.R.C.S., M.1.Mech. E.; Prof D. ROBERTSON, B.Sc., A.I.E.E.; F. R. B. WATSON, B.Sc. CHEMISTRY-Professor-THE PRINCIPAL; Assistant ProfeserG. P. D. SMITH, B.SC., F.I.C., F.C.S.; H. A. M. BORLAND, A.R.C.S.. MATHEMATICS-E. S. BOULTON, M.A., B.Sc.; J. W. PULSFORD, B.A.; A. PICKERING, B.Sc. PHYSICS-1. WILLIAMS, B.Sc.; J. WILSON, B.Sc. With over 70 Lecturers and Demonstrators. There are 11 laboratories 8 workshops, experimental engines, electric light and power station, &c. COURSES for CIVIL, MECHANICAL, ELECTRICAL MINING ENGINEERS, CHEMISTS, ARCHITECTS. BUILDERS. and and UNIVERSITY of LONDON.-COURSES for MATRIC. and B.Sc and D.Sc. DEGREES (including ENGINEERING). FEE: TEN GUINEAS A YEAR. Calendar (6d.) or short Prospectus (free) on application to the REGISTRAR. EVENING CLASS DEPARTMENT. Courses are arranged for the Intermediate and Final Examinations for the B.A. and B. Sc. degrees of the University of London. Students Lakirg the full course pay composition fees and rank as Internal Students of the University. There are also classes in Architectural and Engineerig subjects. For full information and prospectus apply to the Dean (Mr R. W. K EDWARDS) or to the SECRETARY, King's College, Strand, W.C. TUITION BY CORRESPONDENCE by an especial unique method for all Examinations in BIOLOGY. BOTANY, CHEMISTRY, GEOLOGY, HUMAN PHYSIOLOGY, HYGIENE, MATERIA MEDICA, PSYCHOLOGY and ZOOLOGY. Writing reduced to a minimum. Work directed. Test Papers corrected and returned. Address Mr. FREDERICK DAVIS, IMPERIAL COLLEGE, 49 and 51 IMPERIAL BUildings, luDGATE CIRCUS, E.C. Annually for the last Seven Years, about 300 Students SCIENCE & MATHEMATICS. of University Tutorial College have passed London University Examinations. Prospectus may be had post free from the VICE-PRINCIPAL, University Tutorial College, 32 Red Lion Square, Holborn, W.C. AGRICULTURAL COLLEGE, Close to Seaside and Lake District. Situated in one of the finest Stock-raising Districts of the Country. Six farms, dairy, and workshops. Principal J. SMITH HILL, B.A., B.Sc. (Lond.), Assoc. Surveyors' Preparation by Correspondence or Private Tuition for al Examinations, and in all Subjects. Vigorous Coaching by Staff of High Qualifications. Physics, Chemistry, Biology, Botany, &c. Address-Mr. H. J. SMITH, B.Sc. (Lond.), Wanted, a Teacher for Classes in Woodwork, Metal Work, and Drawing. Must satisfy the Department Agriculture, Dublin, as to competency. State experience and salary expected. None need apply except such as have a facility in cel ling boys and communicating knowledge to them.-Address reply 1 The London County Council invites applications for the post of ASSISTANT MISTRESS, specially qualified in elementary experimental science, in the "Hugh Myddelton "Higher Grade Girls' School, Corpora tion Row, Clerkenwell, E. C. The salary will be in accordance with the London County Council scale, particulars of which are set out upon the form of application. Applications should be made on Form 40 H.G., to be obtained from the CLERK OF THE COUNCIL, Education Offices, Victoria Embankment, W.C., to whom they must be returned not later than 10 a.m. on October 15, 1906, accompanied by copies of three testimonials of recent date. Candidates applying through the post for the form of application should enclose a stamped and addressed envelope. Candidates, other than successful candidates, invited to attend the Committee will be allowed third-class return railway fare, but no other BROWNING'S SPECTROSCOPES. John Browning 13. Strand handon THE MINIATURE SPECTROSCOPE. This Instrument will show many of the Fraunhofer lines, the bright lines of the metals and gases, and the absorption bands in coloured gases, crystals or liquids. Price, with Plain Slit £1 2s. Od. Adjustable Slit, &c., in Morocco Case £1 14s. Od. Achromatic Lens, &c., in Morocco Case... £2 Os. Od. and Comparison Prism, in 'Morocco Case ... £2 7s. 6d. "HOW TO WORK WITH THE SPECTROSCOPE." By JOHN BROWNING, F.R.A.S., F.R.M.S., &c. With 20 Illustrations. 7d. post free. a Principal-S. W. RICHARDSON, D.Sc. (London). The Council invite applications for the appointment of ASSISTANT LECTURER in MATHEMATICS. Salary, 150, rising to £200 per annum. Applications, giving particulars of age, training, qualifications and experience, with copies of three recent ... testimonials, must be sent in to the PRINCIPAL on or before October 13, 1906. JOHN BROWNING, Further particulars may be obtained on application to the REGISTRAR. DARLINGTON EDUCATION AUTHORITY. TECHNICAL COLLEGE. WANTED, ASSISTANT LECTURER in the MECHANICAL ENGINEERING DEPARTMENT of the DARLINGTON TECHNICAL COLLEGE. Salary, 120. Must have had workshop training. Applications, stating age, experience and qualifications, should be sent not later than Thursday, October 11. Further particulars may be had on application to the SECRETARY, Education Offices, Darlington. TO SCIENCE AND MATHEMATICAL MASTERS.-Immediate and January (1907) Vacancies.-Graduates in Science and other well qualified Masters seeking posts in Public and other Schools should apply at once, giving full details as to qualifications, &c., to Messrs. GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice of all the best vacancies will be sent. Gentleman, young and well educated, having several years' experience in museum work, desires post as Curator, or similar capacity.-Box 1927, c/o NATURE. Science Graduate, sometime University Lecturer in Chemistry, good linguist, desires part-time tutorial, journal istic, or consulting work.- Replies to "X.," c/o NATURE. TYPE-WRITING UNDERTAKEN BY HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher Local, thorough acquaintance with Modern Languages). Research, Revision, Translation. Scale of charges on application. The Cambridge Type-writing Agency, to Duke Street, Adelphi, W.C. PROTECTION from MOSQUITOES AND OTHER INSECTS. ARMBRECHT'S PYRETHRUM. Ten drops to a tablespoonful of water and sponged over exposed parts prevents insects from biting for about Twelve Hours. 2s. 9d. a Bottle post free inland; 3s. 9d. to all parts of the World. ARMBRECHT, NELSON & CO., Scientific Chemists, 71 & 73 DUKE STREET, GROSVENOR SQUARE, LONDON, W. Manfs, 78 STRAND, LONDON. Optician, ESTABLISHED 1765. FOUR EXPERT OPINIONS ON BAUSCH & LOMB'S MICRO-OBJECTIVES. Mr. F. SHILLINGTON SCALES, B.A., F.R.M.S. (Microscopical Editor of Knowledge and Scientific News), says in the July issue of that Journal : NEW OIL IMMERSION OBJECTIVE. Messrs. A. E. Staley & Co. have sent me, for examination, a new 1-16th inch homogeneous Immersion Objective, with a numerical aperture of 13, made by the Bausch & Lomb Optical Co.. Of the lens under notice I can speak highly. Its definition is excellent. And its working distance ample. I have tested it on some difficult spirilla, as well as in more theoretical ways, and was much pleased with its performance. Dr. B. writes: "I have taken some pains to test the Bausch & Lomb 1-12th Oil Immersion Objective you sent me, against an English Objective of same power, but corrected for long tube-the Bausch & Lomb is undoubtedly the better lens-it is a very fine specimen indeed, therefore I am keeping it, and enclose bank draft." Dr. D. writes: "The colour corrections and resolving power of your high power Objectives are perfect, and compare very favourably with the high-priced objectives made in Europe." Dr. S. writes: "Speaking of your High-Power Objectives 1-12th Oil Immersion. It is extremely perfect in every detail of my tests, and they are very severe, I assure you. If you are yourself a microscopist, you will appreciate that I tell you I counted the dots in 'Amphipleura Pellucida 1/100,000th of an inch, quite easily even with green light, almost the actual theoretical limit of visibility. It is one of the finest Objectives I have ever tested." 2/3rds Dry. 1/6th Dry. 1/12th Oil Imm. 1/16th Oil imm. 160/ Prices: 15/- 30/- 100/ Corrected for 160 m/m Tube Length. Write for Illustrated Microscopical Catalogue (84 pp.), 3 Stamps to cover postage, to the Sole Representatives of the BAUSCH & LOMB OPTICAL CO., for U.K. and Colonies, A. E. STALEY & CO., Contractors to the British, Indian and Colonial Governments, Principal Hospitals, Colleges, and Schools of Bacteriology, 19 THAVIES INN, HOLBORN CIRCUS, LONDON, E.C. MACMILLAN & CO.'S BOOKS FOR STUDENTS OF ZOOLOGY. VOLUME I. JUST PUBLISHED. THE CAMBRIDGE NATURAL HISTORY. EDITED BY S. F. HARMER, Sc.D., F.R.S., AND A. E. SHIPLEY, M.A., F.R.S. Although this volume is the first in the Series as it was planned, it is actually the ninth in order of publication. The final volume (which forms Vol. IV. of the Series) is in the press, and the publishers hope that this important scheme will be brought to 2 conclusion by its publication at a date not far distant. PREVIOUSLY PUBLISHED. WORMS, LEECHES, VOLUME II. Flatworms. By F. W. GAMBLE, M.Sc. Nemertines. By DARD, M.A., F.R.S. Gephyrea, &c. By A. E. SHELLS. VOLUME III. Molluscs and Brachiopods. By the Rev. A. H. Cooke, A. E. SHIPLEY, M. A., F. R.S., and F. R. C. REED, M. A. MANUAL OF ZOOLOGY. With 300 By Prof. T. J. PARKER, D.Sc., F.R.S., and Prof. W. A. HASWELL, M.A., D.Sc., F.R.S. Illustrations. Crown 8vo. IOS. 6d. A TEXT-BOOK OF ZOOLOGY. By Professor T. J. PARKER, D.Sc., F. R.S., and Profes sor W. A. HASWELL, M. A., D.Sc., F.R.S. In Two Vols. With Illustrations. Medium 8vo, 36s. net. INTRODUCTION TO 200LOGY. By C. B. and G. C. DAVENPORT. Crown 8vo. 6s. LESSONS IN ELEMENTARY BIOLOGY. By Prof. T. J. PARKER, D.Sc., F.R.S. Illustrated. Third Edition, revised. Crown 8vo. 10s. 6d. A COURSE OF INSTRUCTION IN ZOOTOMY. (Vertebrata.) By Professor T. J. PARKER, D. Sc., F.R.S. With Illustrations. Crown 8vo. 8s. 6d. By A. H. EVANS, M. A. With numerous Illustrations by G. E. MAMMALIA. By FRANK EVERS BEDDARD, M.A. Oxon., F.K.S., Vice- [Nature Series. A TREATISE ON COMPAR- JENA LABORATORY GLASSWARE. BOILING FLASKS, BEAKERS, RETORTS, TEST TUBES, TUBING FOR EXPLOSION FURNACES, COMPOUND TUBING (D.R.P.) Resisting in a high degree sudden changes of temperature and the action of corrosive chemicals. Combustion Tubing for Elementary Analysis. (Price-list sent free) SCHOTT & GEN. Glassworks, Jena (GERMANY). The Jena Glasses are, in the U.K., on sale with the following firms: VENA TRADE MARK. Aberdeen. A. & J. SMITH, 23 and 25 St. Nicholas Street. Birmingham. F. E. BECKER & CO. (W. and J. George, Ltd., Successors), 159 and 160 Great Charles Street. PHILIP HARRIS & Co., Ltd., Edmund Street. on application. Manchester. JAMES WOOLLEY, SONS & Co., Ltd., Victoria Bridge. Newcastle-upon-Tyne. BRADY & MARTIN, Ltd. London. BAIRD & TATLOCK (London Ltd., 14 Cruss Street, Hatton Garden, E.C. F. E. BECKER & CO. (W. and J. George, Ltd., Successcrs), 33 to 37 Hatton Wall, Hatton Garden, E. C. A. GALLENKAMP & Co., Ltd., 19 & 20 Sun Street, Finsbury, E.C. JOHN J. GRIFFIN & SONS, Ltd., Kingsway, London, W.C. TOWNSON & MERCER, 34 Camomile Street, E.C. SCIENTIFIC PURE CHEMICALS LUDGATE HILL, BIRMINGHAM. Telephone No.: 3825. Telegraphic Address: "LABORATORY, BIRMINGHAM." GLEW'S SCINTILLOSCOPE GLEW'S INTILLOSCOPE PATENT SCREEN PITCH BLENDE (PATENT). Shows a magnificent display of scintillations, showers of sparks, direct from the mineral Pitchblende, Radium, Polonium, Uranium, Thorium, or any radio-active substance, even a Welsbach mantle contains sufficient Thorium to excite the very sensitive screen of the Scintilloscope, which is far more sensitive than the Spinthariscope. The Scintilloscope rivals the most delicate Electroscope as a detector of Alpha rays. The eye sees an inexhaustible shower of stars of white light giving a very realistic idea of the ceaseless activity of these marvellous substances which are producing the terrific bombardment causing this beautiful display. Glew's Scintilloscope, Superior Lens, with Extra-sensitive Pitchblende and Polonium Screens, giving brilliant effects, Complete, 7s. 6d., Post free, U.K. Foreign Postage extra, weight 2 ounces. Pieces of Pitchblende mineral, ground flat and polished, with Sensitive Screen attached, for use in Scintilloscope or with any strong pocket magnifier, from 7s. 6d. each, according to size. Radio active supplies of every description, un Sale or Hire. Radium Bromide, 1,800,000 units on hire for lectures. Nat. Tel. 1787 Hop. F. HARRISON GLEW, Patentee; Radiographer (Silver Medallist, Paris, 1900), 156 Clapham Road, London, S. W. THORIONITE. Ordinary, 4/- per oz. Typical Cubes, all picked, and in. diameter, 9/- per oz.; in., in. and above, at from 1/- to 4/- a cube. Twin Crystals, 2/- per gramme. POST FREE. NEW and EXTENDED EDITION of TABLE of RARE ELEMENTS, giving full scientific particulars, 6d. post free. ARMBRECHT, NELSON & CO., Scientific Chemists, 71 & 73 Duke Street, Grosvenor Square, London, W. BY JOHN MORLEY, M.P. With Portrait. In Two Vols. 8vo, 5s. net each. THE LIFE & EXPERIENCES OF Sir Henry Roscoe, D.C.L., LL.D., F.R.S. Written by Himself. With Photogravure Portraits and other Illustrations. 8vo. 125. net. ADONIS, ATTIS, OSIRIS. IOS. net. Studies in the History of Oriental Religion. By J. G. FRAZER, TRIGONOMETRY FOR 2s. 6d. By Rev. J. B. LOCK, M.A., and THIRD EDITION, REVISED, NOW READY. THE COAL QUESTION. An Inquiry concerning the Progress of the Nation, and the Probable Exhaustion of our Coal-mines. By the late W. STANLEY JEVONS, M.A., LL.D., F.R.S. Third Edition, revised and Edited by A. W. FLUX, M.A. 8vo. IOS. net. THEORETICAL AND PRACTICAL MECHANICS & PHYSICS. A Preliminary Science Course for Artisans in Evening Schools. By A. H. MACKENZIE, M.A., B.Sc., A.R.C. Sc., Head of the Physics Department, Cockburn High School, Leeds. Crown 8vo. IS. A SYSTEM OF APPLIED OPTICS. BEING A COMPLETE SYSTEM OF FORMULE OF THE SECOND ORDER, AND THE FOUNDATION OF A COMPLETE SYSTEM OF THE THIRD ORDER, WITH EXAMPLES OF THEIR PRACTICAL APPLICATION. By H. DENNIS TAYLOR, Optical Manager to T. Cooke and Sons, Ltd., of London, York, and Cape Town 4to. 30. net. OUTLINES OF THE EVOLUTION OF WEIGHTS AND MEASURES AND THE METRIC SYSTEM. By WILLIAM HALLOCK, Ph.D., Professor of Physics in Columbia University in the City of New York, and HERBERT T. WADE, Editor for Physics and Applied Science, "The New International Encyclopædia." 8vo. IOS. net. THIRD EDITION. Entirely Re-written and Enlarged. CHEMICAL TECHNOLOGY AND ANALYSIS OF OILS, FATS, AND WAXES. By Dr. J. LEWKOWITSCH, M.A., F.I.C., &c., Consulting and Analytical Chem ist and Chemical Engineer; Examiner in Soap Manufacture and in Fats and Oils, including Candle Manufacture, to the City and Guilds of London Institute. With 88 Illustrations and numerous Tables. In Two Volumes. Medium 8v. Gilt tops. 36. net. NATURE.-"The standard English book of reference on the subject." FATS AND OILS THE LABORATORY COMPANION TO FATS INDUSTRIES. By Dr. J. LEWKOWITSCH, M.A., F.I.C. 8vo. 6s. net. CHEMICAL TRADE JOURNAL.—“ Bound to become a constant companion to the chemist who deals with oils and fats." SECOND IMPRESSION NOW READY. An Introduction to the Science and Practice of QUALITATIVE CHEMICAL ANALYSIS, INORGANIC. By CHAPMAN JONES, F.I.C., F.C.S., &c. Crown 8vo. 6s. For the New Syllabus of the Preliminary Examination for the Certificate (1907). LESSONS IN SCIENCE. THE BEGINNER'S SET OF MATHEMATICAL INSTRU MENTS. Bow Compass; Dividers; Two Nickel Set Squares (45° and 60° respectively), 4 inches and 5 inches long, tw edges of which show inches and tenths and millimetres; Nickel Protractor; double bevelled 6-inch Rule showing inches and tenths and millimetres; and a Lead Pencil. All enclosed in Metal Pocket-Case. Is. 6d. net. |