Send for our NEW CATALOGUE (80 pp.) of MICROSCOPICAL SLIDES and ACCESSORIES Just Issued. See NATURE, May 17, page 63. FLATTERS & GARNETT, Ltd., 48 Deansgate, Manchester. RUBIDIUM, TANTALUM, GERMANIUM, CASIUM, BERYLLIUM, AND OTHERS, in Gramme Tubes at Reasonable Prices. 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. Collections and Single Specimens of MINERALS, ROCKS, FOSSILS. 25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/-. 20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. In Polished Deal Boxes. Inspection invited of a large stock of Minerals, Rocks, Fossils, and Microscopic Objects. Specimens sent on approval. Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes, Models of Crystals, and other Apparatus for Geologists, &c. NEW CATALOGUES POST FREE. THOMAS D. RUSSELL, 78 Newgate St., London, E.C. NOTICE OF REMOVAL. JAMES R. GREGORY & Co., WATKINS & DONCASTER, Naturalists and Manufacturers of CABINETS AND APPARATUS FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL SPECIAL SHOW-ROOM FOR CABINETS. N.B. For Excellence and Superiority of Cabinets and Apparatus, refer ences are permitted to distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, BIRDS' EGGS AND SKINS. SPECIALITY.-Objects for Nature Study, Drawing Classes, &c. 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. SAVAGE CURIOSITIES. Stock of over 10,000 Specimens of Weapons, Implements, Ornaments, Minerals, Rocks, Fossils, Metallic Ores, Rough Precious Stones, &c. A Large Assortment from all parts of the world always on view, and at 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. LIVING SPECIMENS FOR THE MICROSCOPE. Helix 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. pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy- THE DIRECTOR. 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. CHARGES FOR ADVERTISEMENTS. £ s. d. *Three Lines in Column. Per Line after. One Sixteenth Page, or Eighth Col. 10 o 6 Quarter Page, or Half a Column Half a Page, or a Column 3 5 O 66 O 18 6 Whole Page. I 15 * The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN & CO., Limited. The "INCANDANODE" TUBE (so called because it works all day with the Anode RED HOT). This Tube ran from 9 a.m. to 6 p.m. for five days at the Leicester meeting of the B. M. A. last July, The Anode was incandescent the whole time, but the Vacuum was fully maintained. One Tube will last for years. The Vacuum is easily adjustable. THE BELOT SHIELD FOR X-RAY WORKERS. MR. HALL EDWARDS (at the Leicester meeting of the B. M. A. last July) said of this shield: "It is a scientific instrument designed on scientific lines, and overcomes all the objections which exist in the shields previously brought to my notice." THE MEDICAL SUPPLY ASSOCIATION, 228 GRAY'S INN ROAD, LONDON, W.C. Descriptive Circulars (with expert testimony) on application. SPINTHARISCOPES. (As devised by Sir WM. CROOKES.) Showing the Scintillations of Radium. Fitted with powerful Lens, and contained in neat Leather Case. The scintillations seen in this instrument are from Pure Radium Bromide of the highest known activity, and are brighter and more plentiful than those produced from Pitchblende or any other radio-active substance. See letter from Prof. Gotch on "The Spinthariscope and Retinal Excitability" (NATURE, June 22, 1905, page 174), setting forth a valuable scientific application of the instrument. Calcium Metal (15/- per ib. Thorianite A. C. COSSOR, 54 Farringdon Road, Telephone No. 10547 Central. THE LONDON, E.C. Awarded Gold and Silver Medals at STIGMATIC LENS. BRITISH SERIES II. F/6. Is the best All-round Lens for either Professional or Amateur use. EQUIVALENT TO FOUR LENSES AT THE PRICE OF ONE. J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON, W. Frinted by RICHARD CLAY AND SONS, LIMITED, at MAKERS OF THE CELEBRATED DALLMEYER LENSES. & Lead Street Hil, Queen Victoria Slicet, in in: Cit. of Load by MA a AND CO., LIMITED, at St. Martin's Street, London. W.C., and THL MACMILLAN COMPANY, CC Fitta Avenue. New 1r.-IHURSDAY, July 19, 19-6 JOHN J. GRIFFIN & SONS, Ltd., CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200 DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS. NEGRETTI & ZAMBRA'S 3000 4000 27 26 2000 TI 28 1000 29 30 RAIN CHANGE Compensated FAIR NEGRETTI & ZAMBRA ONDON 26139 500 25 24 31 21 ANEROID BAROMETERS. NEW ILLUSTRATED AND 23 22 9000 6000 7000 8000 Branches 45 Cornhill; SOUTH-WESTERN POLYTECHNIC, MANRESA ROAD, CHELSEA, S. W. The Day College Courses consist of 30 hours per week, and are in prepar ation for London University degrees of B.Sc. in Mechanical and Electrical Engineering, in Chemistry, Physics and Natural Science. Session Fee, £15 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. S. SKINNER, M.A. *W. H. ECCLES, D.Sc. J. LISTER, A. R.C.S. *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. Mathematics and Physics Chemistry and Metallurgy Botany Geology PADDINGTON, W. (UNIVERSITY OF LONDON.) The WINTER SESSION will begin on OCTOBER 1. The Medical School provides complete courses for the Medical Degrees of the Universities of London, Oxford, Cambridge, and Durham; for the Diplomas of M.R.C.S., L.R.C. P.; and for the Naval and Military Medical Services. PRELIMINARY SCIENTIFIC (M. B. Lond.).—A complete Course of Chemistry, Physics, and Biology, under Recognised Teachers of the University, will begin on October 2. SIX ENTRANCE SCHOLARSHIPS in Natural Science, value £145 to £52 10s., will be competed for on September 24-26. Calendar and full particulars on application to the DEAN. COACHING (THEORY AND PRACTICE) Applications for the above appointment Divisional Offices, 2 Greenwich Road, S.E. County Electoral Area and School. CLAPHAM: Wix's Lane. Dept. B. Status. ASST. MASTER, to teach Practical Science. to be sent to Mr. W. Buck, Status. ASST. MASTER. qualified to take charge of laboratory and to teach all stages of Physics and Chemistry. Mechanical Engineering Electrical Engineering ... *A. J. MASLEN, F.L.S. W. W. F. PULLEN, Wh.Sc. A. J. MAKOWER, B.A. * Recognised Teacher of the University of London. Full prospectus from the SECRETARY, post free, 4d.: at the office, price 1d. ARMSTRONG COLLEGE, NEWCASTLE-UPON-TYNE, (IN THE UNIVErsity of DURHAM.) The Council invite applications for the post of LECTURER in MECHANICAL ENGINEERING. Stipend, £300 per annum. Candi. dates must send in six copies of their application and testimonials not later than September 20, 1906, to the undersigned, from whom further particulars may be obtained. F. H. PRUEN, Secretary. Applications for the above appointment to be sent to Mr. W. I. RODGERS, Divisional Offices, Stockwell Road, S. W. Candidates, other than successful candidates, invited to attend the Managers' meeting, will be allowed third-class return railway fare, but no other expenses. Canvassing, either directly or indirectly, will be considered a disqualifi cation. Education Offices, Victoria Embankment, W. C. G. L. GOMME, For other Scholastic Advertisements, see page cxi. It is to be distinctly understood that the appointment gives no claim to pension or indemnity. The Government reserves to itself the right to dismiss the assistant for misconduct or incapacity. In the Government Schools, as in all State Administrations in Egypt, Sunday is a working day. The Schools are closed on Fridays. Leave will be granted on the same terms as to other Government Officials. The possibility of taking leave, and the period of the year at which it is granted, depend upon the exigencies of the service Pay commences from date of arrival in Cairo. On taking up his duties in Cairo, the Assistant will receive one month's pay in lieu of passage money. All applicants should attach a certificate from a legally qualified medical man, stating that in his opinion the candidate would pass as a first-class life for insurance purposes. All applicants should state: Their training and qualifications in Analytical Chemistry, Their age, What foreign languages they know, and If they can be in Cairo by October 1. The latest mail by which applications may be posted will leave London on Friday, August 31. Applications to be addressed :-THE DIrector, Government School of Medicine, Cairo, Egypt. THE GOVERNMENT OF CEYLON TO SCIENCE AND MATHEMATICAL MASTERS.-September Vacancies.-Graduates in Science 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. require a LECTURER in PHYSICS and a LECTURER in CHEMISTRY for the Colombo Medical and Technical Colleges. Salary for each post, £400, rising by annual increments of £25 to £500 a year The Government also require a SCIENCE MASTER for the Royal College, Colombo, to teach Chemistry and Physics for London University Pass Examinations, including the Intermediate B.Sc. Salary, £350, rising to £450 by annual increments of £25. For the above appointments preference will be given to graduates in Salaries are subject to a deduction of 4 per cent. as contribution to the Free passages to the Colony. Leave and pension on same terms as to DARTFORD TECHNICAL INSTITUTE. CHEMICAL DEPARTMENT. The Committee invite applications for the post of TEACHER of Applications should be forwarded not later than August 11 to Mr. D. F. BROW, Technical Institute, Dartford, Kent, from whom further particulars may be obtained. UNIVERSITY OF BIRMINGHAM. LECTURER IN ZOOLOGY. The Council invites applications for the appointment of LECTURER in ZOOLOGY. Stipend, £150 per annum. Particulars and conditions of the appointment may be obtained on application to the SECRETARY. Applications, giving particulars as to qualifications and experience, with six copies of recent testimonials, must be sent to the SECRETARY on or before July 31, 1906. UNIVERSITY GEO. H. MORLEY, Secretary. COLLEGE OF SOUTH WALES AND MONMOUTHSHIRE, CARDIFF. The Council of the College invites applications for the post of DEMONSTRATOR and ASSISTANT LECTURER in BOTANY. Further particulars may be obtained from the undersigned, by whom applications with testimonials (which need not be printed) must be received on or before Saturday, September 1, 1906. J. AUSTIN JENKINS, B.A, Registrar. HARPER-ADAMS AGRICULTURAL COLLEGE. NEWPORT, SALOP. LECTURER IN MATHEMATICS AND LAND-SURVEYING. Applications are invited for the above Lectureship on or before August 12. The Lecturer will be required to enter upon his duties on October 1, 1906. Full particulars can be obtained on application to the PRINCIPAL. Salaries £400 to £500, £350 to £450, and £300 to £400. 20 Science Graduates for Public Colleges, England and Abroad. Also Woodwork vacancy, £150. List of Science and Mathematical Vacancies sent to all Candidates. ORELLANA co. can guarantee each candidate with good references an appointment. No fee till suited. ESTD. OVER 50 YEARS. 80 WIGMORE STREET, LONDON, W. COACHING.-Gentleman with London University diplomas in Applied Science wishes to coach gentlemen reading for examinations in mathematics, electrical and mechanical engineering, and allied subjects, at their own residence or place agreed upon. Apply by letter to "EQUATION," c/o Smith's News Agency, Worcester Experienced Lecturer, young, tall, wishes for engagement round Birmingham or Worcester for the following subjects:-Mathematics, Electrical Engineering, and Applied Physics. Apply by letter to EQUATION,' c/o Smith's News Agency, Worcester. For other Scholastic Advertisements, see page cx. For Sale, a unique Collection of Minerals, some 300 specimens, and catalogue. Can be seen by appointment.— Address W. TRURAN, 163 Richmond Road, Dalston, London, N.E. PROTECTION from MOSQUITOES AND OTHER INSECTS. ARMBRECHT'S PYRETHRUM. Ten drops to a tablespoonful of water and sponged over exposed- 2s. 9d. a Bottle post free inland; Ss. 9d. to all |
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