EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS of British manufacture, in the large hall of the Northampton Institute, during the Convention, open daily from 12 to 10 p.m. In connection with this, a catalogue is in preparation, which will be a useful work of reference in regard to instruments manufactured in this country. The Subscription for Membership of the Convention will be five shillings. Applications for membership should be addressed to the Hon. Sec., Mr. F. J. SELBY, M.A., Elm Lodge, Teddington, Middlesex, who will be glad to furnish further particulars if desired. ADMISSION to the Exhibition, daily, ONE SHILLING, after 7 p.m., Sixpence. Tickets admitting to the Exhibition at any time while it is open, 2/6. BRITISH ASSOCIATION FOR the ADVANCEMENT OF SCIENCE. BURLINGTON HOUSE, LONDON, W. The ANNUAL GENERAL MEETING will be held this year in SOUTH AFRICA, commencing at Cape Town on Tuesday, August 15. PRESIDENT-ELECT: PROFESSOR G. H. DARWIN, M.A., LL.D., Ph.D., F.R.S. Owing to the exceptional circumstances of this Meeting, contributions to the Sectional proceedings have been specially invited. Authors of Papers accepted by the Sectional Committees are reminded that all abstracts (together with the original Papers, if possible) must be sent in to the Office of the Association not later than June 15. Abstracts received after that date will appear in the Annual Report, but cannot be printed before or during the Meeting. A. SILVA WHITE, Assistant Secretary. UNIVERSITY OF LONDON. THE BROWN ANIMAL SANATORY INSTITUTION. (UNDER THE GOVERNMENT OF THE UNIVERSITY.) Notice is hereby given that, in accordance with the Will of Mr. Brown, a course of Five Lectures will be delivered by the Professor-Superintendent (T. GREGOR BRODIE, Esq., M.D., B.Sc., F.R.S.) in the Physiological Laboratory of the University of London, South Kensington, S. W., on Tuesdays, May 30, and June 6, 13, 20 and 27, at Five o'clock each afternoon. Subject: "The Work of the Brown Institution." The Lectures are free to the public. May 19, 1905. By Order of the Senate, PERCY M. WALLACE, UNIVERSITY COLLEGE, LONDON. (UNIVERSITY OF LONDON.) The Council will shortly proceed to fill the vacancy in the Chair of Civil Engineering and Surveying occasioned by the resignation of Professor Vernon Harcourt. Candidates for the appointment are requested to send their applications (accompanied by at least twenty printed copies of any testimonials they may wish to submit) not later than June 10 to the ACTING SECRETARY, from whom full particulars may be obtained. BIRKBECK COLLEGE BREAMS BUILDINGS, CHANCERY LANE, E.C. FACULTY OF SCIENCE. Chemistry Physics ... Mathematics Botany J. E. MACKENZIE, Ph.D., D.Sc ·H. WREN, Ph.D., B. A., B.Sc. (ALBERT 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. (A. 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. BIRKBECK COLLEGE, BREAMS BUILDINGS, CHANCERY LANE, E.C. HISTORY OF CHEMISTRY. A Course of Nine Lectures will be given by Dr. J. E. MACKENZIE on Saturdays, commencing May 27, at 12 noon. Fee for the Course, 55. BEDFORD COLLEGE FOR WOMEN. (UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, LONDON, W. A Reid Scholarship in Arts, annual value £31 10s. first year, £28 71 second and third years, and an Arnott Scholarship in Science, annual value £48, both tenable for three years, will be awarded on the results of an examination to be held at the College on June 28 and 29. For further information apply to the PRINCIPAL. DEPARTMENT FOR PROFESSIONAL TRAINING IN TEACHING. Students are admitted to the Training Course in October and January Two Scholarships, each of the value of £10, will be awarded for the course of Secondary Training beginning in October, 1905. Applications should reach the HEAD OF THE TRAINING DEPARTMENT not later than July 7, 1905. EAST LONDON TECHNICAL COLLEGE. A Course of Four Lectures on Electrical Measurements will be given at the East London Technical College on Wednesdays, May 31, June 7, 14, 21, at 5.30 p.m. Fee for the Course, 55. TUITION BY For MATRICULATION, B.A., SCHOLARSHIPS, and PROFESSIONAL PRELIMINARIES. Tuition in Latin, Greek, French, German, Italian, Mathematics, Mechanics, Physics, Chemistry, Psychology, Logic, Political Economy, Book-keeping. The Staff includes Graduates of Oxford, Cambridge, London, and Roya Universities.-Address Mr. J. CHARLESTON, B.A, Burlington Correspondence College, Clapham Common, London, S.W. TO SCIENCE MASTERS, especially those taking ELECTRICITY as a special subject. Wanted by July 1 next for important College, well-qualified Master for Electricity. One who has had some experience in the organisation of the work of a local Technical Instruction Committee. Salary, £150 to £200 per annum. Candidates for the above and those seeking posts for the term com mencing in September next should apply forthwith, giving details as to qualifications and enclosing copies of testimonials, to GRIFFITHS, SMITH, POWELL & SMITH, School Agents (Estd. 1833), 34 Bedford Street, Strand, London. MEERUT COLLEGE. (NORTHERN INDIA.) Applications are invited for the FIRST (European) PROFESSORSHIP (PHYSICS). Salary, £320 per annum (£50 passage money). Candidates should be University Graduates, under 30 years of age, and unmarried. For particulars apply to Professor WORTHINGTON, Mohuns, Tavistock. At the OPTICAL CONVENTION, May 31 to June 3 (At the Northampton Institute, Clerkenwell, London, E.C.), a number of Optical and other THE CAMBRIDGE SCIENTIFIC CAMBRIDGE, ENGLAND. This Illustration represents the NATURE OF SPARK produced by the NEW HIGH POTENTIAL APPARATUS, which also yields ALTERNATING CURRENTS OF BOTH HIGH AND LOW POTENTIAL. The apparatus is now on view here, or Illustrated Descriptive Pamphlet may be had post free upon application. ISENTHAL & CO., 85 Mortimer Street, London, W. Contractors to the Admiralty, War, India, and Colonial Offices, &c. COURSE OF INSTRUCTION ON OCEAN RESEARCH. T is intended this year, as previously, to give a course of instruction in Bergen, from August 8 to October 14, on Ocean I Research. This will consist partly of lectures, partly of practical instruction and assistance in laboratory work; excursions will also be made, during which the use of various appliances and instruments will be practically demonstrated. All pupils must, however, bring microscopes and magnifying glasses. Each student is charged a fee of about four guineas (Kr. 75.00). Special pupils who desire to continue their studies after the conclusion of the regular course are permitted to do so, and are not required to pay any additional fee. The course will be conducted according to the following plan : I. Dr. A. APPELLÖF :— (1) Systematic examination of representative forms of the fish and invertebrate animals in the fiords, the North Sea and the Norwegian Sea. Demonstration of the most important species and guidance as to classifying them. (2) A review of the distribution of the bottom fauna in the same districts, and its dependence upon the configuration of the bottom and upon hydrographical conditions. (3) Excursions in the adjacent fiords, for the purpose of studying the invertebrate fauna. Opportunities will also be given for morphological study (dissections, &c.) of various types of invertebrates. II. Dr. D. DAMAS: III. IV. Systematic examination of the pelagic Copepoda and Appendicularia, their morphology and biology, with demonstration of the various species. Dr. H. H. GRAN: The plankton algae (diatoms and peridineae), their systematising, biology and distribution. B. HELLAND-HANSEN : (1) Instruction, combined with laboratory practice, on the methods of oceanographic investigations. (2) Review of the results of oceanographic researches of the North-European waters. (3) Lectures on theoretical oceanography, including hydrodynamical calculations of ocean currents. V. Dr. JOHAN HJORT: Review of the biology of the foodfish. The fisheries in the North Sea and the Norwegian Sea. All wishing to attend the above course should apply to THE OCEANOGRAPHICAL INSTITUTE OF BERGEN MUSEUM, BERGEN, NORWAY, before July 1, 1905. Information as to lodging, &c., will be furnished if desired. NOTE. Please state clearly in your application, to what extent you wish to take part in the course of instruction, and give the names of the lecturers, whose lectures you propose attending. THE AGENT-GENERAL for the CAPE An allowance of £50 will be made to cover the cost of the journey to the The accepted Candidate is to assume duty in Cape Town during the first BATTERSEA POLYTECHNIC, S.W. The Governing Body invite applications for the following appointments dating from September next : HEAD of the DEPARTMENT of MATHEMATICS. Commencing Salary, £250 per annum. WOMAN LECTURER in BOTANY for part time. Commencing salary, 120 per annum. For particulars send stamped addressed envelope to the SECRETARY, DAY TRAINING DEPARTMENT. The Council invites applications for the post of MISTRESS of METHOD and LECTURER in EDUCATION. Stipend commencing at £150 per annum. Applications, with one set of testimonials, must be sent to the undersigned not later than June 8, 1905, from whom full par ticulars may be obtained. F. H. PRUEN, Secretary. BY ORDER OF THE SECRETARY OF India Office, Whitehall, S.W., THE SYTAM SYSTEM Saves an incredible amount of wall space and completely utilises dark corners, recesses, and WANTED, for service at the India Store Depôt, Belvedere Road, out-of-the-way places. Lambeth London. S. E., an ASSISTANT INSPECTOR OF SCIEN. Candidates must have a knowledge of optical work as applied to survey. Pension under Civil The selected candidate will be examined by the Medical Board at the India Office, and will only be appointed if passed by the Board. Forms of application can be obtained by writing to the Director General of Stores, India Office, Whitehall, London, S. W., not later than June 5, Prevents crowding and confusion. Allows for extension as and when required. Always room for more, hence reorganisation seldom or never necessary. Saves time, lightens work, and increases comfort by producing perfect order in the Laboratory, Library, Study, Home, Office, &c. SOME SYTAM FITTINGS. 1. THE BOTTLE ELEMENT. The salary attached to the post is £250 per annum, and the lecturer must be prepared to give his whole time to the College. 2. 3. 4. Applications and testimonials must be sent not later than May 31 to the SECRETARY, 38 Bath Street, Glasgow. A FIRST-CLASS BINOCULAR MICROSCOPE (ROSS PATTERN), in good condition, circular movable stage with spring clips substage, rack movement, flat and concave muror with double arm, polariscope, wheel of diaphragms, stand condenser, pair of eyepieces, triple nose piece, 4 objectives (t, . 1 and 2 in.) live box, stage forceps, parabolic illuminator, camera lucida, in mahogany boxes, also with mahogany stand and glass shade; cost about £45, price £30.-Address "BETA," at the office of this Journal. 5. One hundred 4 oz bottles are arranged in one Sytam Bottle Element occupying less than 1 sq. ft. of wall space, each bottle is instantly located, removed or replaced, and any size from -oz. to a Winchester can be accommodated in one and the same element. THE CLOSED-FRONT BOOK ELEMENT. For division of subject into headings, chapters or sections. THE TWIN DESK TRAYS. 6. THE PAMPHLET FILE. THE SYTAM FITTINGS CO., 18 & 19 BASINGHALL BUILDINGS, LEEDS. DR. H. STROUD'S Apparatus for DETERMINING THE SOUND IN AIR, BY THE METHOD OF RESONANCE. The Resonance Tube is 3 ft. long, with a graduated scale fixed at the side. The sliding reservoir moves easily in a grooved frame, so that the water level can be quickly altered. Price, in Polished Mahogany Stand, 24/ SOLE MAKERS BRADY & MARTIN, LTD., Scientific Apparatus Makers, NEWCASTLE-UPON-TYNE. Makers and Dealers in all kinds of Chemical and Physical CONSTRUCTION OF NEW FORMS OF APPARATUS Apparatus for estimation of sulphur in spent oxide FREDK. JACKSON & Co. (Late MOTTERSHEAD & CO.), 14 CROSS STREET, MANCHESTER Goods Entrance: 10 Half-Moon Street. LABORATORY FURNISHERS, Importers, Manufacturers, and Dealers in Of every Description. AND EVERY LABORATORY REQUIREMENT. Illustrated Catalogue of Apparatus, with Price List of Chemicals, free on application. Telegraphic Address-"APPARATUS, MANCHESTER." (MANUFACTURED BY THE BAUSCH & LOMB OPTICAL CO.), As illustrated here, is specialised by us, and constitutes nearly one half of our sales. It has been still further improved in its mechanical construction. We supply this instrument complete in case, with 2/3rd and 1/6th Objectives, and 1" Eyepiece, for £7 4s. 10d. A VISIT WOULD CONVINCE YOU OF ITS SUPERIORITY. Sole Representatives for U.K. and Colonies, A. E. STALEY & CO., 19 THAVIES INN, HOLBORN CIRCUS, LONDON, E.C. Write for Illustrated Microscopical Catalogue (84 pages), 3 Stamps to cover postage. Also Lists of Microtomes, Centrifuges, Photographic Lenses, Shutters and Chemicals of all descriptions post free. W. WILSON, Maker of SPECTROSCOPES, SPECTROMETERS, GONIOMETERS, OPTICAL BENCHES, OPTICAL AND OTHER MEASURING INSTRUMENTS. BEST WORK. MODERATE PRICES. Price List Free. 1, BELMONT STREET, CHALK FARM, N.W. |