MACMILLAN & CO.'S NEW BOOKS. NOW READY. 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. A HANDBOOK OF BRITISH INLAND BIRDS. By ANTHONY COLLETT. With Coloured and Outline Plates of Eggs by ERIC PARKER. Crown 8vo. 65. EVENING STANDARD AND ST. JAMES'S GAZETTE.-"This volume is one to read and to possess. It teaches much that is well worth knowing, and encourages a study that doubles the value and zest of the most ordinary country ramble." 1906 ISSUE READY NEXT TUESDAY. The Statesman's Year-Book. Statistical and Historical Annual of the States of the World. Edited by J. SCOTT KELTIE, LL.D. With Maps. Crown 8vo. 10s. 6d. net. ELECTRICAL ENGINEERING IN THEORY AND PRACTICE. By G. D. ASPINALL PARR, M.Sc., M.I.E. E., A. M. I. Mech. E., Associate of the Central Technical College, City and Guilds of London, Head of the Electrical Engineering Department The University of Leeds. With 282 Illustrations. 8vo. I25. net. MATHEMATICAL PAPERS FOR ADMISSION INTO THE ROYAL MILITARY ACADEMY AND THE ROYAL MILITARY COLLEGE FOR THE YEARS 1896-1905. Edited by E. J. BROOKSMITH, B.A., LL.M. Crown 8vo. 65. THIRD EDITION NOW READY. THE CASES OF THE ATMOSPHERE: THE HISTORY OF THEIR DISCOVERY. By SIR WILLIAM RAMSAY, K.C. B., F.R.S. Extra Crown 8vo. 6s. net. FOR THE NEW SYLLABUS OF ELEMENTARY SCIENCE. LESSONS IN SCIENCE. A Preliminary Course of Physics and Chemistry. By Professor R. A. GREGORY and A. T. SIMMONS, B.Sc. Illustrated. 35. 6d. A MANUAL OF GEOMETRY. at Eton College. Crown 8vo. 35 6d. Tuesday. By W. D. EGGAR, M.A., Assistant-Master An experimental treatment of Geometry, in which Theorems are taken along with the practical work. THE BEGINNER'S SET OF MATHEMATICAL INSTRUMENTS. Bow Compass; Dividers; Two Nickel Set Squares (45° and 60° respectively), 4 inches and 5 inches long, two 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. THE DYNAMICS OF LIVING MATTER. By Professor JACQUES LOEB. 8vo. 12s. 6d. net. MINERALOGY & PETROGRAPHY. The new Spring Price List of Minerals has just been published, and will be sent free on application. Having been able to purchase the extensive and well-known beautiful Collection of the late Professor Damour of Paris, containing a great namber of the rare minerals of old and exhausted occurrences, we can offer an extracedinarily great choice of minerals, such as: Amalgam (fine crystals), Eberrite, Brogniardite, Churchite, Crednerite, Dechenite, Fluellite, Freeslebenite, Hureaulite, Laurite, Miargyrite, Plagionite, Romeite, Trippkeite, beautiful crystals of Gold and Diamant, and many others. PRACTICAL PETROGRAPHY. A test-book for the use of students, with a short description of the polarising microscope, and a detailed description of our Petrographical Collection of 136 Specimens and Slides of Rocks by Professor Dr. K. Busz of Münster, arranged according to H. Rosenbusch: "Elemente der Gesteinslehre," 2nd ed., 1901. • Large collection of 336 specimens of Rocks, 380 Marks; the 336 lides, 420 Marks. Smaller collection of 250 specimens of Rocks, 270 Marks; the 250 studes, 310 Marks. 1. Smaller collection of 165 specimens of Rocks, 170 Marks; the 165 slides, 205 Marks. Coilsitions of Minerals, Fossils, Meteorites, purchased for cash or exchanged. 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- Birds, Mammals, &c., Preserved and Mounted by First-class All Books and Publications on Natural History supplied. Dr. F. KRANTZ, Rhenish Mineral Office, Bonn-on-Rhine, Cermany. MICRO. OBJECT ESTABLISHED 1833. OBJECT MOUNTING. MASON'S PREPARED OBJECTS have 25 years' reputation for quality. 9 Doubly Stained Botanical Sections; 6 Insect Dissections; 9 Various Diatoms (some test); 18 Miscellaneous Specimens. Full Instructions for Mounting with each; 1/1 per Series, post free. List and Sample, 2 Stamps. I See notice in NATURE, May 3, page 15. R. G. MASON, 69 Clapham Park Rd., London, S.W. Every Requisite for Micro. Work. Collections and Single Specimens of MINERALS, NATURAL CRYSTALS, NEW CATALOGUES POST FREE. THOMAS D. RUSSELL, 78 Newgate Street, LONDON, E.C. LIVING SPECIMENS FOR THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Amœba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Štephanoceros, Melicerta, and many other specimens of Pond Life. Price 18. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM. The following animals can always be supplied, either living or preserved by the best methods : Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy- THE DIRECTOR. NATURE should be addressed to the Publishers; Editorial of NATURE is "PHUSIS," LONDON. CHARGES FOR ADVERTISEMENTS. £ s. d. TO ALL PLACES ABROAD:- £ s. d. . 0 14 6 *Three Lines in Column 8 o 15 6 One Sixteenth Page, or Eighth Col. 10 One Eighth Page, or Quarter • The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN & CO., Limited. CHEAPEST AND MOST USEFUL FORM OF RESISTANCE FOR EXPERIMENTAL WORK ON THE MARKET. and a variety of other laboratory resistances. USE THE TUDSBURY Pneumatic Electric Machine No. 2. This machine has cylinders 15 inches diameter and is, in power, equal to an ordinary Wimshurst having 10 plates 28 inches diameter. It will produce a good negative, through the thorax, of the ribs and spinal column with an exposure of five To regulate PRESSURE and CURRENT, series or shunt, minutes, and will show the bones in various parts of the body distinctly, on the fluorescent screen, when a suitable tube is used. NEW ILLUSTRATED LIST OF RHEOSTATS (covering various patterns) post free. ISENTHAL & CO., 85 MORTIMER STREET, Contractors to the Admiralty, War, India, and Colonial Offices,&c. A (PATENT APPLIED FOR). B THESE Simple Extractors are much more effective than Scxhlets for many purposes, as the substance is kept covered by the solvent in use and a flow of clean solvent is continu. ously moving directly through the substance, where by the extraction is greatly facilitated. Price-A, 7/- doz.; B, 8/- doz. C, Complete apparatus, with Condenser (Burgess's Patent), all stoppered together, 7/6. Sole Makers C. E. MÜLLER, ORME & CO., Ltd., Scientific Glass Blowers and 148 HICH HOLBORN, LONDON, W.C. CONTRACTORS TO H.M. GOVERNMENT. C SOLE AGENTS TOWNSON & MERCER. 34 CAMOMILE STREET, LONDON, E.C. FOCAL PLANE The Stereoscopic New "Focal Plane Standard" is the smallest practical Camera made fitted with a Shutter giving exposures up to 1/1000 of a second, and adapted for using daylight loading spools. Price complete in Morocco case and fitted with Series III Goerz lens for pictures 4 by 31 £15 0:0 The Ideal Camera for instantaneous photographs, and equally suitable for other kinds of work. Write for CATALOGUE 12a, free from The LONDON STEREOSCOPIC COMPANY, 106 & 108 Regent Street, W., or 54 Cheapside. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 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, 66 Fifth Avenue, New York.-THURSDAY, May 17, 1905. Library £5 12s. 6d. Double Nose-piece, 9/- extra. Focussing Substage, 14 6 extra. CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplied DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS. NEGRETTI & ZAMBRA'S ELECTRICAL Illustrated Price List and full particulars post free on R. & J. BECK, Ltd., NEGRETTI & ZAMBRA, 68 CORNHILL, 38 HOLBORN VIADUCT. Branches: 45 CORNHILL, and 122 REGENT STREET, The Free Library Committee invite applications from qualified persons to fill the position of CURATOR of the MUSEUM and DIRECTOR of the LIBRARY, at a Salary of £110 (one hundred and ten pounds) per annum, with a new residence adjoining the Library, containing two reception rooms, four bed rooms, bath room, &c., with electric light and water laid on, free. Limit of age, 25 to 45 years. Candidates will be expected to have a liberal education, including a knowledge of French and Latin, and to give particulars of the examinations they have passed. A special written and oral examination of candidates whose qualifications have been approved of will be held in the following subjects, viz. :-The Irish Language, up to the standard of the Pass Degree of the Royal University, Irish History, Irish Antiquities, Bibliography, Freehand Drawing (ele mentary). Applications, accompanied by copies of testimonials as to character, &c., will he received by me not later than Monday, June 11 prox. Canvassing will be a disqualification. EGYPTIAN GOVERNMENT SCHOOLS. In view of the extension of Secondary Education in Egypt, applications are invited for new ASSISTANT-MASTERSHIPS in Secondary Schools under the Ministry of Education. Masters to begin work in October, in Cairo or Alexandria, and to teach in English exclusively. Over 400 boys in each School, mainly Mohammedans. In the case of two of the Masters now required, the subject mainly essential is Science (Experimental Physics and Chemistry); six of the new Masters will be principally engaged in teaching Mathematics; the others will be concerned more particularly with the teaching of English, including History and Geography. Candidates should be not less than 23 nor over 30 years of age, have a robust constitution, and have taken a University Degree in Honours. They should have experience as Teachers: preference will be given to applicants who hold a Diploma in Teaching. Salary, £295 per annum (Eg.24 per mensem), rising to £393 per annum (Eg.32 per mensem). Allowance for passage out to Egypt. Teaching hours, on an average, four daily, Fridays only excepted. Summer vacation not less than two months. Applications, with full statement of qualifications and accompanied by copies only of testimonials, must be sent in before May 31, 1906, marked outside Assistant-Masterships," and addressed to H. J. BOYD-CARpenter, Esq., Senior Inspector, Ministry of Education, Cairo, Egypt, to whom candidates may apply for further information. BOROUGH OF HASLINGDEN. MUNICIPAL SECONDARY SCHOOL. WANTED, SENIOR MISTRESS, especially qualified in French. Commencing salary, £120, rising by biennial increments of £10 to £160 per annum, with further increments not automatic on special recommendation. ASSISTANT MISTRESS; commencing salary, 100 per annum, rising by biennial increments of £10 to £135 per annum, and by further increments not automatic on special recommendation. Candidates for either position must be graduates or possess equivalent qualifications. Applications, endorsed "Senior Mistress" or "Assistant Mistress" as the case may be, stating age, qualifications, experience and when dis engaged, and accompanied by copies only of three recent testimonials. to be sent to the undersigned not later than Tuesday, the 29th day of May instant. WALTER MUSGROVE, Town Clerk. Municipal Offices, May 15, 1906. MATRICULATION, INTERMEDIATE, FINAL. PREPARATION by CORRESPONDENCE (Residence abroad no impediment) or ORAL TUITION on a THOROUGHLY INDIVIDUAL SYSTEM. Fees based on success. The STAFF includes Graduates of Oxford, Cambridge, London, and Royal Universities, Science Medallists, Prizemen, Scholars, &c. SINGLE SUBJECTS TAKEN: Science, Mathematics, Logic, Psychology, Political Economy, Latin, Greek, French, German, &c. For terms, &c., address Mr. J. CHARLESTON, B.A. (Lond. and Oxon.), Burlington Correspondence College, Clapham Common, London, S. W. MUNICIPAL TECHNICAL SCHOOL, LEICESTER. Headmaster-J. H. HAWTHORN, M.A. MASTER, WANTED, for September 1, a MATHEMATICAL Graduate preferred. Previous experience in a similar Institution ai additional recommendation. There are day and evening classes, and all students are over 15 years of age. Commencing salary, £150 per annum. Applications should be sent in by June 9 on the printed form to be obtained from T. GROVES, Secretary. Canvassing will disqualify. Education Offices, Town Hall, Leicester, May 22, 1906. UNIVERSITY OF BIRMINGHAM. TWO ASSISTANT LECTURESHIPS IN MATHEMATICS. The Council invites applications for the above appointments. Stipends, £175 and £150 per annum, respectively. Applications, accompanied by testimonials, should be sent to the undersigned not later than Tuesday, June 5, 1906. The candidates elected will be required to enter upon their duties on October 1, 1906. Further particulars may be obtained from GEO. H. MORLEY, Secretary. BIRKBECK COLLEGE.--BOTANY.There will be a vacancy in September for a HEAD of the BOTANY DEPT. At present the appointment is not full time, but for three mornings (or afternoons) and three evenings per week. Salary pro posed, 200. Candidates should state academic and other qualifications, age and experience in teaching, and should enclose not more than three testimonials.-Apply (not later than June 5)_to_PRINCIPAL, Birkbeck College, Breams Buildings, Chancery Lane, E. C. BEDFORD COLLEGE for WOMEN. (UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, W. The Council are about to appoint a DEMONSTRATOR in CHEMIS TRY. Applications, with testimonials, to be sent in by June 20 to the SECRETARY, from whom particulars can be obtained. HILDA WALTON, Secretary. Wanted, a competent Draughtsman, to take occasional work in drawing diagrams (scientific and technical) for bookwork Apply, stating qualifications and terms per hour, to “S. E., c/o "University Correspondent," Burlington House, Cambridge. |
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