Dr. J. S. HALDANE'S PORTABLE APPARATUS FOR ANALYSIS OF MINE GASES. Dr. Haldane, 1905, p. 116.) screw into the base, so that it TOWNSON ÉNERCER THE WOODHOUSE INCLINED PLANE. . Price 25/ The external Dr. Haldane's Mine Gas Apparatus £3 17 6 Mercury, pure, for same, 2-1b. in 0 8 6 Caustic Potash Solution, 1.pint in 0 weight when 10 charged ready “ The Investigation of Mine Air," for use is about by Sir C. Le Neve Foster and five pounds. Dr. Haldane, 1905 0 Sole Makers : C. E. MÜLLER, ORME & CO., Ltd., 148 HIGH HOLBORN, LONDON, W.C. 34 CAMOMILE STREET, E.C. A REALLY FIRST-CLASS X-RAY TUBE, equal in workmanship and results to Tubes double the price. 16/6 ISENTHAL & CO., 85 MORTIMER STREET, LONDON, W., Contractors to the Admiralty, War, India, and Colonial offices, &c. Printed by RICHARD CLAY AND SONS, LIMITED, at ; & 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, to Fifth Avenue, New York. - THURSDAY, July 13, 1,3 " To A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE solid ground [PRICE 15 CENTS Registered as a Newspaper at the General Post Office.) (All Rights are Reserved. PRACTICAL NOTES ON Free on application to rat Further Particulars and Prices of this and other long range Barometers sent on application to the ManufacturersNEGRETTI & ZAMBRA, 38 HOLBORN VIADUCT, E.C. Branches: 45 CORNHILL, and 122 REGENT MINISTRY of PUBLIC INSTRUCTION, BIRKBECK COLLEGE EGYPT. FACULTY OF SCIENCE. DAY AND EVENING COURSES. Chemistry SJ. E. MACKENZIE, Ph.D., D.Sc. Candidates must have had practical experience as engineers, and have (H. WREN, Ph.D., B.A., B.Sc. been engaged on work of a class intimately related to the subjects to be ALBERT GRIPPITHS, D.Sc. taught. They should be from 25 to 35 years of age, unmarried, and have a Physics ... D. OWEN, B.A., B.Sc. robust constitution. (B. W. CLACK, B.Sc. A University Degree or Diploma in Engineering is an essential qualifi- Mathematics E. H. SMART, M.A. cation. {: Salary about £430 per annum (£ Eg35 per mensem), rising to about Botany (A. B. RENDLE, M.A., D.Sc. 6553 per annum (4 Eg. 45 per mensem). Allowance for passage out to (F. E. FRITSCH, Ph.D., B.Sc. Egypt. Bachelor quarters are provided. Zoology .. H. W. UNTHANK, B.A., B.Sc. Applications, with full statement of qualifications, and accompanied by Geology & Mineralogy Geo. F. HARRIS, F.G.S. copies only of testimonials, must be sent in before July 22, 1905, addressed Assaying, Metallurgy & Mining. Geo. PATCHIN, A.R.S.M. to W. C. MACKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom candidates may apply for further information. RESEARCH in Chemistry and Physics in well-equipped laboratories. French, German, Spanish, Russian, Dutch, & Itallan Classes. MINISTRY OF PUBLIC INSTRUCTION, EVENING CLASSES also in Biology, Physiology, Practical Geometry, EGYPT. Building and Machine Construction, Steam, Tbeoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating. Calendar 6d. (post free 8d.), on application to the SECRETARY. At the SOUTH-WESTERN POLYTECHNIC, Preference will be given to candidates having experience of Practice and Manresa Road, Chelsea, S.W., Day College Courses of thirty hoars Teaching. They should be from 23 to 33 years of age, unmarried, and bave per week will be conducted in preparation for the London University a robust constitution. Degrees of B.Sc. in Mechanical and Electrical Engineering, in ChemisA University Degree or College Diploma is an essential qualification. try, Physics and the Natural Sciences. The composition fee for the Salary about £295 per annum (6 Eg. 24 per mensem), rising to about Session of three terms, 1905-1906, is £15. These Courses are recog. 5393 per annum (L Eg. 32 per mensem). Allowance for passage out to nised for “ Internal Students of the University, and consist of Egypt. Bachelor quarters are provided. lecture and laboratory instruction. The Courses are conducted by : Applications, with full statement of qualifications, and accompanied by MECHANICAL ENGINEERING, W. W. F. Pullen, A. Macklow copies only of testimonials, must be sent in before July 22, 1905, addressed Smith; ELECTRICAL ENGINEERING, A. J. Makower; to W. C. MacKENZIE, Esq., D.Sc., 5 The Crescent, Cromer, to whom CHEMISTRY, J. B. Coleman, J. C. Crocker, and F. H. Lowe; candidates may apply for further information. MATHEMATICS and PHYSICS, S. Skinner, W. H. Eccles, J. Lister and L. Lownds; BOTANY, H. B. Lacey and T. G. Hill; GEOLOGY, A. J. Maslen. In the evenings similar Courses will be COUNTY COUNCIL OF THE conducted, but at £2 per Session. Also TECHNICAL DAY COURSES of three years' duration are arranged as a preparation for WEST RIDING OF YORKSHIRE. the Engineering, Electrical and Chemical and Metallurgical pro EDUCATION DEPARTMENT. fessions. The Laboratories and Workshop are open for RESEARCH under the direction of The Principal and the Heads of Departments, SECONDARY SCHOOLS. Further particulars may be obtained on application to The The West Riding Education Committee will require in September the SECRETARY, who will send the Calendar and Prospectus for 3d., ar services of : ONE ASSISTANT MASTER to teach principally Mathematics. it may be obtained at the Office, price id. Salary, £150 per annum. TWO ASSISTANT MISTRESSES to teach principally Science. Salary, £120 each per annum. ST. MARY'S HOSPITAL MEDICAL ONE ASSISTANT MISTRESS to teach principally Mathematics and SCHOOL, PADDINGTON, W. paratory work. Salary, 6120 per annum. The WINTER SESSION will begin on OCTOBER 2. ONE ASSISTANT MISTRESS to teach principally English and The Medical School provides complete courses for the Medical Degrees Physical Exercises. Salary, £100 per annum. of the Universities of London, Oxford, Cambridge and Durham; for the Applications for these posts must be made on forms to be obtained from Diplomas of M.R.C.S., L.R.C.P.; and for the Naval and Military the Education Department (Secondary), County Hall, Wakefield, where Medical Services. they must be returned not later than Saturday, July 29, 1905. Copies of PRELIMINARY SCIENTIFIC (M.B.LOND.). --A complete course not more than three recent testimonials must be sent with the application. of Chemistry, Physics and Biology, under recognised Teachers of the Canvassing will be a disqualification. University, will begin on October 3. SIX ENTRANCE SCHOLARSHIPS in Natural Science, value 145 COUNTY COUNCIL OF THE to £52 10s., will be competed for in September. Calendar and full particulars on application to the DEAN. THE GROCERS' COMPANY'S SCHOLARSHIPS. The West Riding Education Committee will require in September the With the object of encouraging original research in Sanitary Science, the services of TWO MASTERS (one qualified in Science and Mathematics, Grocers' Company offer TWU SCHOLARSHIPS, each of 6300 a year, and one in English and General Subjects) for the purpose of conducting with an allowance to meet the cost of apparatus and other expenses in Courses of Instruction for Groups of Elementary Teachers and undertaking connection with the work, tenable for one year, but renewable for a second some teaching in Secondary Schools, at £200 each per annum. or third year, subject to the conditions of the scheme under which they Applications for these posts must be made on forms to be obtained from are established. the Education Department (Secondary), County Hall, Wakefield, where The next Election will take place in May, 1906. They must be returned not later than Saturday, July 29, 1905. Copies of Applications must be sent in before April 1 to the CLERK OF THE pot more than three recent testimonials must be sent with the application. GROCERS' COMPANY, Grocers' Hall, Londoo, E.C., from whom a form of Canvassing will be a disqualification. application and further information may be obtained. BIOLOGY-Wanted, an Assistant to help B.A. AND B.Sc. EXAMS. generally in Biological Laboratory on four afternoons and four evenings per week; must be qualified to take Elementary Board of Education MATRICULATION, INTERMEDIATE, FINAL. Class in Physiology. 'Salary, Eso, and free admission to other classes in College. - Apply to PRINCIPAL, BIRKRECK COLLEGE, Breams PREPARATION by CORRESPONDENCE and ORAL TUITION Buildings, E.C. on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based on The STAFF includes Graduates of Oxford, Cambridge, London, and BIRKBECK COLLEGE. Royal Universities, Science Medallists, Prizemen, Scholars, &c. The Council invite applications for the appointment of ASSISTANT SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, LECTURER in MATHEMATICS. Cominencing salary, 4175, to date Psychology, Political Economy, Latin, Greek, French, German, &c. from September 15 next. For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oron, Applications, stating age, degrees and qualifications, teaching experi. Burlington Correspondence College, Clapham Common, London, S. W. ence, and enclosing testimonials, must reach the PRINCIPAL not later ihan August 30. Birkbeck College, Breams Buildings, Chancery Lane, E.C. For other Scholastic Advertisements, see pages cxiii an. cxiv. success. TRADE Metol-Quinol papers and INDIAN FOREST SERVICE. THE SECRETARY of State for INDIA IN COUNCIL gives notice that, in view of the late date at which the Regulations for the Appointment of Probationers to the Indian Forest Service were published this year, he bas decided to modify them(a) by extending till Tuesday, August 1, the period within which appli cations will be received ; (7) by admitting to the examination candidates who undertake to pass Brand Responsions or its equivalent before October next, failing which their selection would be cancelled ; (c) by permitting candidates to offer Zoology at their discretion. Applications for admission to the examination must be made on a printed form to be obtained (with the revised Regulations) from the SECRETARY, Judicial and Public Department, India Office, Whitehall, London, S.W. The age limits are 18 10 21 years on January 1, 1905. A. GODLEY, Under Secretary of State. Equally good for plates, films, bromide papers, gas - light ENGINEERING DEPARTMENT. lantern slides. The Governors of this Institute will be prepared to receive applications from persons qualified to reach the following subjects in Evening Classes :-MECHANICAL ENGINEERING (City and Guilds of London Insti. Economical, compact and tate course). STEAM and HEAT ENGINES with Laboratory work. portable. Keeps perfectly. Per carlon to make 44 ounces, 1/For further particulars apply to C. T. MILLIS, Principal. Borough Polytechnic Institute, Sold by all dealers and chemisis 103 Borough Road, London, S.E. WRITE FOR BOOKLET GRATIS THE GLASGOW AND WEST OF BURROUGHS WELLCOME AND CO. LONDON, SYDNEY AND CAPE TOWN PHO. 105 officer appointer will be to secure the co-ordination of ibe work of the Continuation Classes in Mathematics, Engineering Drawing and Building Construction, conducted by the School Boards of Glasgow and Govan, with the College Evening Classes in the same subjects. His work in this con. nection will be under the supervision of a Joint Committee representing the School Boards and the College; in regard to his other duties, he will be under the direction of the Governors of the College, and must place bis whole time at their disposal. Candidates must have a sound knowledge of WANTED for WOLMER'S SCHOOL, two of the subjects named, as well as experience in teaching them. Salary KINGSTON, JAMAICA, by September 12, 1905, an ASSISTANT not less than £300 per annum. Applications must be sent to the MASTER to iake charge of the Science Teaching (Physic, and SFCRETARY, Technical College, Glasgow, on or before July 29. Chemistry) throughout the School, and to teach ordinary class : ubjects in addition. Salary, £150 (One Hundred and Fifty Puunds) por COUNTY BOROUGH OF BURY. annum, non-resident. Passage money to Jamaica (418) will be pad, but must be refunded by the Master appointed if he resigns within MUNICIPAL TECHNICAL SCHOOL. twelve months ; 612 10 be refunded on resignation in the second year; 46 on resignation in the third year. Medical certificate of health WANTED, to begin duties on September 1, 1905, well qualified required. Apply, stating scientific qualifications, subsidiary subjects, TEACHER of THEORETICAL and 'PRACTICAL PHYSICS, who &c., and enclosing testimonials, to w. CowPER, M.A., Headmaster, will be required to give instruction to Pupil Teachers during the daytime Wolmer's School, Kingston, Jamaica. Applications made in response for about twelve hours a week, and (for about thirty weeks in the year) to to this advertisement (those already made need not be repeated) should students of the Evening Classes on five evenings a week. be posted not later than Thursday, July 27. Salary, 150 per annum. Applications, stating age, qualifications, and teaching experience, should reach the undersigned not later than July 27, 1905. MASTERSHIPS VACANT FOR SEP. ROBERT WILKINSON, TEMBER. - Physics, College in India, 6320, and passage ; Director of Education. Mathematical, Public College, England, 1200; Several Science Education Offices, Bank Street, Bury, Graduates, Public College, London University Teaching (entre, 6150 July 14, 1905. to 6300; Ditto, Mathematical, 6150 to $300; #nglish, must be in Honors, 6150 to £175; English and French, 6150 to 6175; 200 COUNTY OF LONDON. Vacancies for Senior, Junior, and Foreign. JUNIOR. ASSISTANT NATURALIST, HORNIMAN MUSEUM. ORELLANA CO. Applications are invited for the post of JUNIOR ASSISTANT to the Send List to all Candidates, Naturalist at the Horniman Museum, Forest Hill, S.E. Preference will be given to applicants who have made a practical study of some branch of 80 WIGMORE STREET, LONDON, W. Natural History, and have a general knowledge of Zoology. Importance will be attached to good handwriting, and an acquaintance with photographic methods is desirable. Commencing wages, iss. a week. Appli- MUNICIPAL TECHNICAL SCHOOLS, cations in the candidate's own handwriting, with copies of not more iban tbree testimonials, must be sent to the undersigned not later than 10 a.m. LIMERICK. on July 28, 1905. G. L. GOMME, A PRINCIPAL is required for the above Schools who would also County Hall, Spring Gardens, Clerk of the Council. undertake to teach Electricity in the evenings. Salary, 1200 to 6250, according to qualifications and experience of July 20, 1905. organising work. Application to be sent before July 31 to THE SECRETARY, 69 George To SCIENCE and MATHL. MASTERS.- Street, Limerick. REQUIRED (1) Master qualified to teach Theoretical and Practical Science, &c. Commencing salary, 6150, non-res. Secondary School near London. (2) Assistant Master for General Elementary Science. KENT EDUCATION COMMITTEE. Degree not necessary, 22 hours' work a week. Technical Institute in Keot. 6140 to 4160, non-ses. (3) Two Masters required for TECHNICAL INSTITUTE, TUNBRIDGE WELLS. Physics and Chemistry under Dept. of Agriculture and Technical Applications are invited for the post of ASSISTANT in the SCIENCE Instruction, Eroo each, resident. Grammar School. For particulars DEPARTMENT. Salary, 4150. Apply to H. W. Cook, Principal. of the above and many other vacancies, address :-GRIFFITHS, SMITH, POWELL & SNITÁ, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand. For other Scholastic Advertisements, see tages cxii and cxiv. HANDSWORTH EDUCATION COMMITTEE. TECHNICAL SCHOOL. WANTED for September next, an ASSISTANT SCIENCE MASTER for the Technical School. The person appointed to devote the whole of bis time to the duties connected with the appointment. Chief subjects, Physics and Mathematics. Classes every evening and part day. Salary: £140 per annum. THOMAS H. MOON, Secretary. GUY'S HOSPITAL. LABORATORY, MUSEUM, STOREROOM, &C., you can save ths of your wall space and find what you want on the instant. BRIDLINGTON HIGH SCHOOL IN THE SYTAM SYSTEM One hundred 4 oz. bottles occupy less than and MATHEMATICS. Degree or equivalent. Apply Head MISTRESS. one square foot of wall space; each bottle is A large Manufacturing Company is open to instantly located, removed or replaced, and any engage in a confidential position a young Englishman who possesses size from { oz. to a Winchester can be accommothorough knowledge of Chemistry, Inorganic and Organic, and who understands the elements of Mechanical Engineering. A knowledge dated in the same sized Element. of French and German desirable. State age and family connections, and where education has been acquired. Reply to "MANUFACTURER,' c/o STREET's, 30 Cornbill, London, E.C. WRITE FOR THE BROWN LIST Wanted, Manager for High-class Scientific TO THE Apparatus Business. Applicant must have had good experience and a thorough scientific training. --- Apply, stating age, salary required, and full particulars, 10 ALPHA," c/o NATUR& Office. Technical Chemist, well up in general | 18 & 19 BASINGHALL BUILDINGS, chemistry and analysis of carbohydrates and brewing materials, accus LEEDS. tomed to supervision of students, aged 27, requires post, moderate salary.-Address 1864, NATURE. Accurate and First-class A.R.C.Sc.(Geology), Asst. Demon Inexpensive. strator R.C.Sc., requires vacation work (to end of September). -- Apply TyRRELL, 59 Liverpool Road, Watford. PRICE SYTAM FITTINGS CO., F. G. CUTTELL, Preparer of ROCKS, MINERALS, &c., for Microscopic Examination.-19 Abbotstone 21/ page 232 PHOTOMICROGRAPHY for Publishers, Lecturers, Manufacturers, and general scientific research. Good work, moderate charges.-Saxby, 91 Penny Lane, Seston Park, Liverpool. THE NEW PATENT PIESMIC BAROMETER. TYPE-WRITING UNDERTAKEN BY HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. Descriptive To be obtained of all Opticians, or Pamphlet the SOLE MAKERS, Post Free. F. DARTON & CO., CLERKENWELL OPTICAL WORKS, 142 ST. JOHN STREET, LONDON, E.C. SCIENTIFIC WORTHIES. GLASS BLOWING. A List of this Series of Steel and the Publishers. NOTICE. All kinds of Scientific and Experimental Any form of Glass Apparatus repaired. H. HELM, 66 HATTON GARDEN, LONDON, E.C. Actual Maker of all kinds of X-Ray and Vacuum Tubes, |