UNIVERSITY OF LONDON.-University P. J. HARTOG, Academic Registrar. SWINEY LECTURES on GEOLOGY, 1906. UNDER THE DIRECTION OF THE TRUSTEES OF THE BRITISH MUSEUM. A Course of Twelve Lectures on "The Geological History of the E. RAY LANKESTER, Director. British Museum (Natural History), Special arrangements for students undertaking research during vacations THE SIR JOHN CASS TECHNICAL JEWRY STREET, ALDGATE, E.C. Principal Also preparation for the B.Sc. Examination of London Chemistry Mathematics H. BURROWS, A.R.C.S., Ph.D., F.I C. R. S. WILLOWs, M.A., D.Sc. C. O. BANNISTER, ASSOC. R.S.M. G. M. K. Læggett, B.A. Every facility for special and advanced practical work in well-equipped laboratories both in the afternoon and evening. For details of the Classes apply at the Office of the Institute, or i, letter to the PRINCIPAL. W. H. DAVISON, M.A., Clerk to the Governing Body AGRICULTURAL COLLEGE, Close to Seaside and Lake District. Situated in one of the finest Stock-raising Districts of the Country. Six J. SMITH HILL, B.A., B.Sc. (Lond.), Assoc. Surveyors' COACHING (THEORY AND PRACTICE) In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for MEDICAL EXAMS. Especial Course of Instruction in THERAPEUTICS, PHARMACOLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY EXAM. Mr. FREDERICK DAVIS, The Laboratories, (Registered in Column B (Advanced Education), Teachers Registration Council, Board of Education, S.W.), 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C. SCIENCE & MATHEMATICS. Vigorous Coaching by Staff of High Qualifications. Physics, Chemistry, Biology, Botany, &c. Address-Mr. H. J. SMITH, B.Sc. (Lond.), CALCUTTA UNIVERSITY. NOTICE. In January, 1907, the Senate will proceed to appoint a whole-time officer as REGISTRAR of the UNIVERSITY on a salary of Rs.800 per mensem, rising to Rs. 1oco in five years by four annual increments of Rs. 50. Applications for the post must reach the undersigned on or before December 17, 1906. Candidates are required to send printed copies of their testimonials. Canvassing will be considered a disqualification. The Registrar will be appointed in the first instance for five years only, but at the end of every such term he may be re-appointed. He must be a graduate of position with experience of University affairs. He may be a member of the Senate, but not of the Syndicate. The duties of the Registrar will be as follows: (a) To be the custodian of the Records, Library, Common Seal, and such other property of the University as the Syndicate will commit to his charge. (b) To act as Secretary to the Syndicate and to attend all meetings of the Senate, Faculties, Syndicate, Boards of Studies, Board of Accounts, Boards of Examiners, and any Committees appointed by the Senate, the Faculties, the Syndicate, or any of the Boards, and to keep Minutes thereof. (<) To conduct the official correspondence of the Syndicate and the Senate. (a) To issue all notices convening meetings of the Senate, Faculties, Syndicate, Boards of Studies, Board of Accounts, Boards of Examiners, and any Committees appointed by the Senate, the Faculties, the Syndicate, or any of the Boards. (e) To perform such other work as may be, from time to time, prescribed by the Syndicate, and generally to render such assistance as may be desired by the Vice-Chancellor in the performance of his official duties. It is competent to the Syndicate to grant to the Registrar, on full pay. leave of absence for one month in a year, or for an accumulated period not exceeding four months in five years. It is also competent to the Syndicate to grant him, on half pay, leave of absence which may be added to the period of leave on full pay for a period not exceeding eight months in five years. It is competent to the Syndicate to grant to the Registrar a gratuity or pension regulated as follows: (a) After a service of less than ten years, a gratuity not exceeding one month's salary for each completed year of service. (6) After a service of not less than ten years up to twenty-five years, a pension not exceeding one-sixtieth of the average salary (ie., the average calculated upon the last three years of service) multiplied by the number of years of completed service. (<) The pension will, in no case, exceed Rs 5000 per annum. In case of misconduct or neglect of duty, the Registrar shall be liable to suspension by the Syndicate, and to dismissal by the Senate on the report of the Syndicate. The selected candidate will be required to join his post by the middle of February, 1907. He will continue to hold office not later than March 31, C. LITTLE, Registrar. 1912. Senate House, September 7, 1906. CALCUTTA UNIVERSITY. NOTICE. In January, 1907, the Senate will proceed to appoint a salaried INSPECTOR for the purpose of inspecting Colleges affiliated to this University. Applications for the post are hereby invited, and they must reach the undersigned on or before December 17, 1906. Candidates are required to send printed copies of their testimonials. Canvassing will be considered a disqualification. The appointment will be made by the Senate subject to the approval of Government. The Inspector of Colleges will be appointed in the first instance for five years only, but at the end of every such term he may be re-appointed. He must be a person of high academic standing and one possessing some experience of Indian Colleges. He will be a whole-time officer of the University, and his salary will be Rs. 800 per mensem, rising to Rs. 1000 in five years by four annual increments of Rs. 50. He may be a Fellow of the University, but must not be a member of the Syndicate. The duties of the Inspector of Colleges will be : (a) To report on Colleges applying for affiliation. (b) To inspect affiliated Colleges, and (c) To inspect such Schools as may, from time to time, be indicated by the Syndicate. It is competent to the Syndicate to grant to the Inspector of Colleges, on full pay, leave of absence for one month in a year, or for an accumulated period not exceeding four months in five years. It is also competent to the Syndicate to grant him, on half pay, leave of absence which may be added to the period of leave on full pay for a period not exceeding eight months in five years. The Inspector of Colleges may, with the permission of the Syndicate, avail himself of the College vacations, The Syndicate may grant to the Inspector of Colleges a gratuity or pension regulated as follows: (a) After a service of less than ten years, a gratuity not exceeding one month's salary for each completed year of service. After a service of not less than ten years, up to twenty-five years, a pension not exceeding one-sixtieth of the average salary (ie., the average calculated upon the last three years of service) multiplied by the number of years of completed service. (c) The pension will, however, in no case, exceed Rs. 5000 per annum. In case of misconduct or neglect of duty, the Inspector of Colleges will be liable to suspension by the Syndicate and to dismissal by the Senate on the report of the Syndicate. THE MINING SCHOOL, CAMBORNE. The committee of this school invite applications for either, or all, of the following positions which are now, or soon will be, vacant. MINING. HEAD of the DEPARTMENT; manager of the school mine and lecturer on mining; ore dressing, etc. SURVEYING. HEAD of the DEPARTMENT; practical instruction and lectures. GEOLOGY. LECTURER who also takes geological surveying, with or without petrology. Applicants should give the usual particulars, including salary required, and should send three recent Testimonials. Applications should be sent before October 27 to the SECRETARY at the school, from whom further particulars may be obtained. CITY AND COUNTY BOROUGH OF BELFAST. MUNICIPAL TECHNICAL INSTITUTE. The Library and Technical Instruction Committee invite applications for the position of HEAD of the DEPARTMENT of PURE and APPLIED CHEMISTRY. Salary, £350 per annum. Forms of Application and Conditions of Appointment may be had from the undersigned. Applications must be lodged on or before MONDAY, November 5, at 12 (noon). Canvassing is prohibited and will disqualify. Municipal Technical Institute, Belfast. October 13, 1906. FRAS. C. FORTH, Principal. Ornithologist, Oologist, Naturalist, Photographer, desires position on Museum staff.-SYDNEY SMITH, 20 Park Crescent, York. TYPE-WRITING 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 Cam bridge Type-writing Agency, 10 Duke Street, Adelphi, W.C. JUST OUT. The 13th Edition of our Catalogue of AND MATHEMATICAL INSTRUMENTS PROFUSELY ILLUSTRATED. FULLY REVISED. A copy will be sent gratis on application. W. H. HARLING, Mathematical, Drawing, & Surveying Instrument Manufacturer, Established 1851. Contractor to several departments of H. M. Govt. RADIUM ON HIRE. (Activity 1,800,000 units.) Self-Luminous Radium Screen, 5/- Post free within United Kingdom. F. HARRISON GLEW, Patentee, "TECHNICAL" SERIES of PHYSICAL APPARATUS. Prof. HARTL'S OPTICAL DISC and POLARISING APPARATUS, covering all the important experiments in LIGHT. See NATURE, Aug. 2, page 338. Send for Illd. Descriptive Paft (including instructions for workings post free from the Sole Agents for UK. and Colonies. A. GALLENKAMP & Co., Ltd., 19 & 21 SUN STREET, FINSBURY SQUARE, LONDON, E. C. CHEMICALS RARE METALS MINERALS For Laboratory, Scientific, and all other SILICON CARBIDE, iridescent crystals, 1/- oz.; 10/6 lb. HARRINGTON BROS., LTD., Chemical Manufacturers and Dealers, 156 Clapham Rd., London, S. W. 4 OLIVER'S YARD, CITY ROAD, LONDON, E.C. Telephone No.: 3825. Telegraphic Address: "LABORATORY, BIRMINGHAM." LIQUID AIR MEASURING INSTRUMENTS. BEST WORK. MODERATE PRICES. Price List Free. 1 Belmont Street, Chalk Farm, London, N.W. AND LIQUID HYDROGEN. THE PHOTO AUTOCOPYIST Dr. HAMPSON'S AIR-LIQUEFIER is now made to a standard pattern, and numbers are in use in University Laboratories and elsewhere in various countries. The whole apparatus is neat and compact and its parts very easily moved; the Liquefier, without stand, being a cylinder 17 inches high and 8 inches in diameter. It begins to liquefy air in from 6 to 10 minutes after the admission of air at from 150 to 200 atmospheres pressure, making over a litre of liquid per hour. It requires no auxiliary refrigerant and produces a perfectly clear liquid which requires no filtering. The operator has only one gauge to watch and one valve to control. HYDROGEN LIQUEFIER to the designs of Dr. MORRIS W. TRAVERS for use in conjunction with Air-Liquefier. For prices and particulars of the above and commercial apparatus of the same description manufactured under the Linde and Hampson patents apply to THE BRITISH OXYGEN CO., Ltd., (Formerly Brin's Oxygen Co., Ltd.) (a simplified form of Collotype without elaborate plant) for repres NATURE says:-"As a means of quickly obtaining per manent prints from photographic negatives it should preve cxtremely useful." THE BLACK "BOX,' a light, compact, folding, portable, cloth dark-room, on the umbrelta NATURE says:- Useful to every photographer, whether Write for Specimens, &c., or call and see these useful Inventions. 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. Prices: 15/ 30/ 100/ Corrected for 160 m/m Tube Length. 160/ 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. J. SWIFT & SON, Manufacturing Opticians. SEVEN GOLD MEDALS AWARDED FOR OPTICAL IMPROVED UNIVERSITY MICROSCOPE, With I in. and in. or in. Objectives, one Ocular and Iris Diaphragm, in Cabinet ... £9 10 0 Quite unlike all other apparatus devised for the same purpose, this instrument has no multiplying levers in its construction, and thus obviates all possibilities of error through any slight fault in the curvature of the bar being greatly magnified in direct ratio to the magnifying power of the levers. It depends for its action on the use of widely differing coefficients of expansion, namely, Nickel Steel and Vulcanite, which give sufficient direct movement, without the use of levers or other gear. This action produces a range of about three-quarters of an inch for every 10° F. It is supplied, complete, with clock and drum, and records continuously for a week without changing the chart. Price £2 17s. 6d., complete, with 8 day clock. Japanned Zinc Case, with Celluloid Window, 7s 6d. extra. LANDER'S PATENT ANEMOMETER, Records the force of every separate puff of wind BAROGRAPH (Aneroid or Mercurial) RECORDING RAIN GAUGE £4 10s. £4 10s. £4 10s. STUDENTS' MICROSCOPES. DISSECTING INSTRUMENTS, and all Accessories. NEW AND SECOND-HAND. C. BAKER, 244 HIGH HOLBORN, LONDON. W. G. PYE & CO., INSTRUMENT MANUFACTURERS, GRANTA WORKS, CAMBRIDGE. SUBSTANTIAL, RELIABLE LABORATORY APPARATUS AT REASONABLE PRICES. MACMILLAN CO.'S LIST. PAGAN RACES OF THE MALAY PENINSULA. By WALTER WILLIAM SKEAT, M.A., Author of " Malay Magic," &c., and CHARLES OTTO BLAGDEN, M.A. With numerous Illustrations specially taken for the Work. Two Vols. 8vo. THE TODAS. 42s. net. By W. H. R. RIVERS. With numerous Illustrations and a Map. Svo. 21. net, VOLUME I. NOW READY. THE CAMBRIDGE NATURAL HISTORY. PROTOZOA. EDITED BY S. F. HARMER, Sc. D., F. R.S., AND A. E. SHIPLEY, M.A., F.R.S. VOLUME I. By Professor MARCUS HARTOG, M.A. (D.Sc. Lond.). PORIFERA (SPONGES). By IGERNA B. J. SOLLAS (B.Sc. Lond.). COELENTERATA AND CTENOPHORA. By Professor E. W. MACBRIDE, 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 conclusion by its publication at a date not far distant. Professor E. A. MINCHIN in The Tribune:-"The authors in each case have fulfilled admirably the task imposed upon them. They have produced a lucidly written work, which is no less useful to the specialist than it is interesting to the amateur, stimulating the novice to go deeper into the fascinating study of natural history and animal life." PERSIA PAST AND PRESENT. A Book of Travel and Research. By Professor A. V. WILLIAMS JACKSON. With over 200 Illustrations and a Map. 8vo. 17s. net. [Friday. THIRD EDITION READY NEXT TUESDAY. A HISTORY OF CHEMISTRY FROM EARLIEST TIMES TO THE PRESENT DAY, being also an Introduction to the Study of the Science. By Professor ERNEST VON MEYER, Ph.D. Translated by GEORGE MCGOWAN, Ph.D. Third Edition, with various additions and alterations. 8vo. 175. net. SECOND IMPRESSION NOW READY. An Introduction to the Science and Practice of QUALITATIVE CHEMICAL ANALYSIS, INORGANIC. 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... THE ELEMENTS OF ELECTRICAL ENGINEERING. A Text-Book for Technical Schools and Colleges. By Professor WILLIAM S. FRANKLIN, and Professor WILLIAM ESTY. Volume I. Direct Current Machines, Electric Distribution and Lighting. Illustrated. 8vo. 185. 6. net. |