CRYSTALLOGRAPHY. WATKINS & DONCASTER, Our New Catalogue, XIX., with many illustrations, has just come out (post free on application). The following are included: 1. New Collection of 416 Crystal-models of wood, containing the crystal forms and combinations represented by illustrations in the 4th ed. of the Physikalische Kristallographie," by Prof. P. Groth (1955) at Munich ... £27 10 0 2. Large Collection of 916 Crystal-models of wood to illustrate the crystal forms of the minerals, by Prof. C. Hintze at Breslau. £90 0 0 3. New Collection of 8 Trigonal-Glass-models of Calcite, with the crystallographic axes according to Bravais (Weiss) and with the ates according to Miller, constructed by Prof. J. Beckenkamp at Würzburg ... £1 15 0 4. New Collection of 450 Crystal-models of pasteboard, systematically arranged according to the 32 classes of symmetry, by Prof. K. Vrba at Prague £48 0 0 5. The Planes of Symmetry, 5 models constructed by Prof. K. Vrba at Prague ... £5 15 0 6. The Optical Wave Surfaces, 4 wire-models constructed by Prof. K. Vrba at Prague ... £6 8 0 ... 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, references 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. Mecker Bunsen Burner (A WONDERFUL INVENTION). LIVING SPECIMENS FOR THE MICROSCOPE. Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price is. per Tube, Post Free. Helix 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. I 10 6 *Three Lines in Column Per Line after 8 £ s. d. о 2 6 | Quarter Page, or Half a Column I 15 O Half a Page, or a Column 3 5 0 Whole Page 660 o 15 6 One Sixteenth Page, or Eighth Col. 10 • The first line being in heavy type is charged for as Two Lines. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street in the City of London, and published by MACMILLAS 1906 A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE "To the solid ground Of Nature trusts the mind which builds for aye."-WORDSWORTH. No. 1910, VOL. 74] THURSDAY, JUNE 7, 1906 Registered as a Newspaper at the General Post Office.] [PRICE 15 CENTS [All Rights are Reserved. VERLAG VON GUSTAV FISCHER IN JENA. Soeben erschienen : LEHRBUCH DER ZOOLOGIE FÜR STUDIERENDE. Von Dr. J. E. V. BOAS, Professor der Zoologie an d. Landw. Hochschule Kopenhagen. Vierte vermehrte Auflage. Mit 577 Abbildungen. Preis: 10 Mk., geb. 12 Mk. LEHRBUCH DER ENTWICKLUNGSGESCHICHTE o. ö. Professor a. d. Universität Berlin. DIE WIRBELTIERE EUROPA'S. Mit Berücksichtigung der Faunen von Norderasien und Analytisch bearbeitet von Professor Dr. OTTO SCHMIEDEKNECHT, Custos des Fürstl. Naturalien-Kabinets in Rudolstadt. Preis: 10 Mark. PHOTOGRAPHIC LENSES. A SIMPLE TREATISE. By CONRAD BECK and HERBERT ANDREWS. 1/-, Post Free 1/3. This somewhat difficult subject is made clear without the use of mathematics. R. & J. BECK, Ltd., 68 CORNHILL, LONDON. PRACTICAL NOTES ON TELEPHOTOGRAPHY. Free on application to NEGRETTI & ZAMBRA'S R. & J. BECK, Ltd., 68 CORNHILL, LONDON. SEPTEMBER MATRICULATION. BIRKBECK COLLEGE, Day and Evening Classes for the September Matriculation of London University may be taken up at any time, as the Classes at UNIVERSITY TUTORIAL COLLEGE work continuously through the Summer vacation. successes at January Matriculation. Classes in Fifty-two PRACTICAL CHEMISTRY, PHYSICS, BIOLOGY AND GEOLOGY are held during August. Prospectus may be had, post free, from the VICE-PRINCIPAL, University Tutorial College, Red Lion Square, Holborn. BEDFORD COLLEGE FOR WOMEN. (UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, W. A Clift-Courtauld Scholarship in Arts, value £31 10s. first year, £28 75. second and third years; a Pfeiffer Scholarship in Science, annual value £48, tenable for three years; a Deccan Scholarship in Arts, annual value £40, tenable for three years; a Deccan Scholarship in Science, annual value £60. tenable for three years; will be awarded on the results of the Examination to be held at the College beginning on June 27. For further information apply to the PRINCIPAL. DEPARTMENT FOR PROFESSIONAL TRAINING IN Students are admitted to the Training Course in October and January. The Course includes full preparation for the examinations for the Teaching Diplomas granted by the Universities of London and Cambridge. Two Deccan Scholarships, each of the value of £22 10s., and two Scholarships, each of the value of £20, will be offered for the Session beginning October, 1906. Candidates must hold a degree or an equivalent. Applications must reach the HEAD OF THE DEPARTMENT not later than July 2. BEDFORD COLLEGE FOR WOMEN. (UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, W. The Council offer TWO RESEARCH SCHOLARSHIPS, each of the value of £50, one in Physiology, one in Zoology, for the Session 1906-7 only. Applications should be sent by June 20 to the PRINCIPAL, from whom further information can be obtained. ROYAL SOCIETY OF LONDON. MACKINNON RESEARCH STUDENTSHIPS. There are two Studentships each of the value of £150. One of them is awarded for research in the group of the Physical Sciences, including Astronomy, Chemistry, Geology, Mineralogy and Physics; the other is awarded for research in the group of the Biological Sciences, including Anatomy, Botany, Paleontology, Pathology, Physiology and Zoology. The Studentships are awarded annually for one year, but are renewable for a second year. Under exceptional circumstances they may be renewed for a third year. The Studentships are restricted to British subjects. Applications must be received not later than June 22. Further particulars and forms of application can be obtained from the ASSISTANT SECRETARY BREAMS BUILDINGS, CHANCERY LANE, E.C. FACULTY OF SCIENCE. DAY AND Evening courSES, under Recognised Teachers of the University of London. Assaying, Metallurgy & Mining. GEO. PATCHIN, A.R.S.M. 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. MILLPORT MUNICIPAL TECHNICAL SCHOOL, PORTADOWN. The services of a TEACHER of ENGINEERING SUBJECTS are required for the coming Session, commencing September 1. The work is partly day and partly evening, totalling 27 hours per week. The subjects are those immediately allied to Mechanical and Electrical Engineering, and the examinations are those of the S. and A. Dept, and the City and Guilds of London Inst. Candidates will be expected to be qualified to earn grants under the S. and A. Dept., and to be registered for at least one subject under the City and Guilds Inst. Salary offered is £120 to £130, according to qualifications and experience. Applications, stating training, experience, teaching experience, if any, with copies of three recent testimonials, should be sent to the undersigned by June 15. W. M. CLOW, Hon. Sec. INDIAN AGRICULTURAL DEPARTMENT. The Secretary of State for India in Council invites applications for TWELVE APPOINTMENTS in the INDIAN AGRICULTURAL DEPARTMENT, for which five all-round Agriculturists, three Agricultural Botanists, and four Agricultural Chemists are required. Candidates should possess a University Honours Degree, or recognised diploma in agriculture, agricultural botany, or agricultural chemistry, as the case may be, and should not be under 23 or over 30 years of age. Applications should be received before the end of June. Further particulars and application forms may be had from the SECRETARY, Revenue Department, India Office, S. W. India Office, London, NOTICE. NATURE Of THURSDAY NEXT, JUNE 14, will contain the INDEX to VOL. LXXIII., and be published at ONE SHILLING. APPARATUS made of GLASS & QUARTZ and all kinds of SCIENTIFIC GLASS-BLOWING. ...Advertisements intended for insertion in this number OTTO BAUMBACH should reach the Publishers by the morning of Tuesday, June 12. OFFICE OF "NATURE," ST. MARTIN'S STREET, LONDON, W.C. UNIVERSITY OF ABERDEEN. The UNIVERSITY COURT will, at a MEETING in JULY, proceed to appoint an additional EXAMINER in each of the following Subjects, viz.(t) Botany, (2) Chemistry. (Glass-Blower by Appointment to the University of Manchester), 10 Lime Grove, Oxford Road, Manchester. PLATES Applications, along with fifteen copies of testimonials (should the candi- FOR date think fit to submit any), are to be lodged with the SECRETARY on or before and prox. University of Aberdeen, BLACKBURN ROBERT WALKER, MUNICIPAL TECHNICAL SCHOOL. ASSISTANT LECTURER required on the Science side in September. Subjects: Pure Physics and some Mathematics. Time allowed for Research. Salary, 120, rising to £140 by annual increments of £10. Applications to be forwarded not later than June 12 to the DIRECTOR OF EDUCATION, Education Offices, Library Street, Blackburn, from whom details of duties may be obtained. WOOLWICH POLYTECHNIC. The Governors of the Woolwich Polytechnic invite applications for the following appointments: 1. LECTURER in CHEMISTRY. Commencing salary, £180 per annum. 2. LECTURER in PURE and APPLIED MATHEMATICS. Com. mencing salary, £180 per annum. Further particulars may be obtained from the PRINCIPAL (on receipt of a stamped and addressed envelope), to whom applications should be forwarded not later than June 30. BEDFORD COLLEGE FOR WOMEN. (UNIVERSITY OF LONDON.) YORK PLACE, BAKER STREET, W. The Council are about to appoint an ASSISTANT in MATHEMATICS, salary £100, and a JUNIOR DEMONSTRATOR in PHYSICS, salary £75, for the Session 1906-7. Applications, from women only, with testimonials, to be sent by June 20 to the PRINCIPAL, from whom particulars can be obtained. 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. KING'S COLLEGE, LONDON. The Council invite applications for the post of SENIOR LECTURER in PHYSICS. Applications should be sent in by Friday, June 15. For conditions apply to WALTER SMITH, Secretary. OWEN'S SCHOOL, ISLINGTON. PHYSICS MASTER required in September, fully qualified, good experience. Also FORM MASTER to teach English, Elementary Mathematics, junior French and German on the oral method; graduate with good experience. The salaries generally commence at £150. Apply af once to the HEADMASTER, giving full particulars of qualifications and experience, and copies of three recent testimonials. TO SCIENCE AND MATHEMATICAL MASTERS.-Immediate and September Vacancies.-Graduates and other well qualified Masters seeking posts in Public and other Schools should apply at once, giving full details as to qualifications, &c., to Mears. GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice FOR SPECTROSCOPY AND ASTRONOMY. The Pinachrome and Pinacyanol Bathed Plates are far more colour-sensitive than any previous plate, and have a very fine grain. Special plates can be made to suit special work. Write for the S Booklet. WRATTEN & WAINWRIGHT, LTD., CROYDON. G. BOWRON, 57 EDGWARE ROAD, LONDON, W. has always on hand a large and varied stock of SECOND-HAND |