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GAS PLANT. GAS ENGINE AND DYNAMO. Electric Current for 100 16-c.p. lamps can be obtained for ONE PENNYWORTH of fuel per hour by using a CROSSLEY
GAS ENGINE and Dynamo combined, running on a CROSSLEY SUCTION GAS PLANT.
Full particulars and testimonials on reference to CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER.
WATSON'S MICROSCOPES & OBJECTS. Watson's New "Club" Microscope. An Instrument of full size of New Slide of Radium for Microscope. Shows Scintillations most modern design. Especially arranged for the use of Amateurs. brilliantly, and easily managed-quite new
56 Monocular, £15; Binocular, £18
Trypanosoma Brucei (Sleeping Sickness) ..
40 Human Spinal Cord-prepared by Golgi's method
40 Watson's well-known Van Heurck and Edinburgh Student's Micro
Beautiful Polyzoa-Cristatella mucedo, with Slatoblasts scopes have been re-modelled in the Stage and Foot, and give even Coelenterata-Campanularia, Obelia, Clytia, and many others, greater convenience for working than before.
26 The Watson-Conrady Condenser System is of new computation, and
Exquisite arranged groups composed of Diatoms. Splcules, &c, is expressly designed for Photo-Micrography.
according to size, from
5/- 10 21 0
Scales and Hairs of Insects arranged to represent Sprays, New Aplanatic Magnifiers. New Objectives. Everything
Bouquets, and Vases of Flowers, always interesting and
attractive ... for the Microscopist.
7/6, 151-, 21/and 42
Write for Catalogue No. 3 of Micro. Objects, together with really For all the above see Watson's 158-page Catalogue of Microscopes, sent published supplementary list of Slides, giving details of recenils post free.
added specimens, post free (SPINTHARISCOPE for observing the Scintillations of Radium. The very best. Price 21/SPECIALITIES:- STRUTT'S RADIUM CLOCK. Price ing to quantity and quality of Radium included.
(RADIUM of MAXIMUM activity in stock, also of medium and moderate activities. Send for particulars. W. WATSON & SONS, 313 HIGH HOLBORN, LONDON, W.C. ESTABLISHED 1837.
BRANCH-16 Forrest Road, Edinburgh.
Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and push
AND Co., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York, - THURSDAY, Marco.
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE
“ To the solid ground
NEGRETTI & ZAMBRA'S CELL-TESTING VOLTMETER.
RAIN GAUGE. GRIFFIN, LONDON
Half Nat. Size.
Mounted in handsome Nickel-plated Case, 22/6,
Illustrated Price Lists of Self-Recording and other Scientific
Instruments Post Free to all parts of the World. NEGRETTI & ZAMBRA,
38 HOLBORN VIADUCT. Branches : 45 CORNHILL, and 122 REGENT STREET,
COUNTY OF LONDON.
NORTHERN POLYTECHNIC EDUCATION ACTS, 1870 TO 1903.
INSTITUTE, The London County Council invites applications for the following
TIOLIOWAY, LONDON, N. ap. ointments in the Education Department :
FOUR DIVISIONAL INSPECTORS, who will have the general (Close to llulloway Sın., G N. R., and llighbury Sto., N.LR.) superintendence of large districts and give special attention to the co- LONDON UNIVERSITY SCIENCE AND ENGINEERING ordination of education within their areas. Their chief duries will be to
DEGREES. inspect pupil teachers' centres, secondary schools, training colleges, science
Day and Evening Courses in the above under recognised teachers inand commercial centres, polytechnics, and all institutions for higher educa. tion aided by the Council. Candidates will be required to possess special MATHEMATICS, qualifications in one of the following subjects :-(1) English language and
PHYSICS, literature ; (2) Modern languages; (3) Mathematics and Science ; (4) Tech.
CHÉMISTRY, nology (including mechanical and electrical engineering). The salary will be in each case 660 a year, rising by annual increments of 625 to a
ENGINEERING. maximum salary of £800 a year.
Separate Laboratories for Elementary, Advanced and Honoun uudents, ONE ART INSPECTOR, whose chief duties will be to inspect the art exceptionally large and well equipped. teaching in elementary and secondary schools, art schools and polytechnics.
RESEARCH. The salary will be 6400 a year, rising by annual increments of £20 to a maximum salary of £500 a year.
Accommodation and apparatus provided for research in either Pure o ONE INSPECTOR of WOOD and METAL WORK, whose chief Applied Chemistry and Physics, and Engineering, in rooms specialis duties will be to inspect the teaching in wood and metal work in manual adapted for this purpose training centres and elementary and secondary schools. He will also be Full particulars at ibe Institute or sent on receipt of postcard. required to inspect certain classes at polytechnics. The salary will be £400
REG. CLAY, D.Sc., Principal a year, rising by annual increments of £20 to a maximum salary of £500 a year.
ONE INSPECTOR of WOMEN'S TECHNICAL CLASSES, whose UNIVERSITY OF BIRMINGHAM chief duties will be to inspect technical classes for women (including up
Faculties. holstery, flower making, needlework, millinery, dressmaking and dress: cutting) in evening, schools, girls' clubs and polytechnics. The salary will SOIENCE, ARTS, MEDICINE, COIMMERCE. be £300 a year, rising by annual increments of £20 to a maximum alary of £400 a year.
SPECIAL SCHOOL OF MODERN LANGUAGES The persons appointed will be under the control of the Chief Inspector,
DEPARTMENT FOR TRAINING or TEACHERS. and will be required to give their whole time to che duties of the office, and
Scbools of will in other respects be subject to the usual conditions attaching to the Council's service, particulars of which are given in the form of application. ENGINEERING, METALLURGY, MINING, BREWING, In connection with the appointments there is no restriction with regard to
DENTISTRY, Applications should be made on the official form to be obtained from the
Leading to Degrees and Diplomas. Clerk of the London County Council at the County Hall, Spring Gardens, S.W., or at the Education Offices, Victoria Embankment. W.C. The ALL COURSES AND DEGREES ARE OPEN TO BOTH MEN AND WOME applications must be sent in not later than 10 a.m. on Saturday, April 1, STUDENTS. 1905, addressed to the Education Offices as above, and accompaniei by In the Medical School there is a separate Dissecting Roure for me copies of not more than three recent testimonials.
with a qualified Woman Demonstrator, Canvassing, either directly or indirectly, will be held to be a disqualification for appointment.
Graduates of other Universities may, after two years' study or research, G. L. GOMME,
take a Master's Degree. Clerk of the London County Council.
Syllabuses with all information will be sent on application to the Spring Gardens, S.W.,
SECRETARY. March 2, 1905.
THE SIR JOHN CASS TECHNICAL
A Course of Twelve Lectures and Demonstrations on
will be given during the Summer Term by
G. SENTER, B.Sc., Ph.D.,
Lecturer on Chemistry at
St. Mary's Hospital Melical Serie SIR WA. DE WIVELESLIE ABNEY, K.C.B., D.C.L., F.R.S. The Right Hon. The LORD BLYTHSWOOD,
The Lectures and Demonstrations will be held on Wednesday
Evenings, 7-9 p.m., commencing Wednesday, March 29. Six W. H. M. CHRISTIF, K.C.B , M.A., F.R.S.,
The Course is arranged for students of Chemistry and Physics en la
Astronomor Koyal. those engaged in Chemical and Electrical industries, who desire to w1213 a The Right Hon. The Earl of CRAWFORD, K.T., LL.D., F.R S. knowledge of the modern developments of Physical Chemistry. Mr. Thos. R. DALLMEYER, F.R.A.S.
It will also be adapted to the requirements of caudidates for the fines
B.Sc. examination of London University.
A Course of Laboratory Work in connection with the lectures si"
be held on Wednesday afternoons. SIR HOWARD GRUBB, F.R.S.
A detailed Syllabus may be had upon application at the Otñce of The Right Hon. The LORD KELVIN, O.M., G.C.V.O., F.R.S. Institute or by letter to the PRINCIPAL. THE RIGHT Hon. The LORD RAYLEIGH, O.M., D.C.L., F.R.S.
W. H. DAVISON, M.A., Clerk to the Governisa Hay. The Right Hox. THE EARL OF Rosse, K.P., D.C.L., F.R.S. TH HE OPTICAL CONVENTION will be held at the North
SOUTH-WESTERN POLYTECHNIC, AMPTON INSTITUTE, CLERKENWELI, E.C., from May 31 to June 3. inclusive.
MANRESA ROAD, CHELSEA, LONDON, S.W. The object of the Convention is to bring into co-operation those interested in Optical Matters, from all sides of the question, theo. retical, practical, and commercial.
Short Courses suitable for the Intermediate and Fioal B.Sc. E1202 The morning, will be devoted to papers and discussions on Optical tions of London University will be conducted by Teachers recognised subjects. These will be collected in a volume to be issued by ihe the University as follows: Convention. There will be an
GEOLOGY.-A. J. Maslen, F.L.S. An Excursion (about s ar EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS during the Easter vacation) to the Isle of Wight, for the study of of British manufacture, in the large hall of the Northampton Institute,
Geology of the Island; also Museum Demonstrations and Fr during the Convention, open daily from 12 to 10 p.m. In connection
Meetings near London during the Summer Term. with this, a catalogue is in preparation, which will be a useful work of reference in regard to instruments manufactured in this country BOTANY.-T. G. Hill, A.R.C.S., F.L.S. A Summer Courx
The Subscriprion for Membership of the Convention will be five Practical Plant Physiology and Ecology, with suitable Excwga shillings. Applications for inembership should be a dressed to the
the Study of Plant Relationships. Saturdays, 10 to 1, camce *** Hon. Sec., Mr. F. J. SELBY, MA., Elm Lodge, Teddington, Middlesex, who will be glad to furrich fur' her particulars is desired.
April 8. ADMISSION to the Exhibition, daily, ONE SHILLING, For particulars, apply to the Head of the Natural Science Departneri
after 7 p.m., Sixpence. Tickets admitting to the Exhibition at any time while it is open, 2/6.
For other Scholastic Advertisements, see page CXCIT.
OPTICAL CONVENTION, 1905.
сxciii BROWNING’S SPECTROSCOPE S.
The STUDENT'S SPECTROSCOPE has a prism of extremely dense
Laboratory and for all general work in Spectrum Analysis.
£7 0 0 With Tangent Screw Motion to Vernier, Rack to
Telescope, and extra-power Eyepiece, in Cabinet £8 16 0
ILLUSTRATED CATALOGUE OF SPECTROSCOPES AND SPECTROMETERS, POST FREE.
JOHN BROWNING, 78 Strand, London, W.C. PHOSPHORESCENT
LIQUID AIR AND LIQUID HYDROGEN.
Specially selected for use with Radium Beta Rays, Ultra-violet
Light, Sunlight, or Magnesium Light.
false gem for comparison.
DIAMOND SCREENS, 15/- each
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 apply to the Sole Makers :BRIN'S OXYGEN COMPANY, LIMITED,
ELVERTON STREET, WESTMINSTER, S.W.
(GLEW'S PATENT). Showing Scintillations with Alpha Rays, mounted with Radium,
complete, 20/- each.
Polonium, 7/6 each.
For charging any class
SANGER - SHEPHERD
Made in Four sizes, to charge
from 5 to 6 Amperes,
secure photographs with all the beauty
your own camera.
For PartiCULARS WRITE
OR CALL STEWART, LIVETT & CO., 62 Theobalds Road, London, W.
(FOUR MINUTES WALK FROM HOLBORN TOWN HALL )
JAMES SWIFT & SON'S
Apochromatics. * N.A., 1.30, oil immersion
£8 8 0 1.40
10 10 0 1/12" 1.40
8 8 0 Pan-Aplanatics. " oil immersion, N.A., 1.30
5 5 0
1 16 0
2 17 0
2 0 0 NATURE says :-"In the excellence of their 1/12-in. homogeneous oil immersion, they have produced an English-made lens of first-rate capacity which is a marvel of cheapness."
LISTS POST FREE ON APPLICATION,
UNIVERSITY OPTICAL WORKS, 81 Tottenham Court Road, London.
Complete Outfits to attach to Plate Cameras, including
from £8 14 O
or call and see results obtained by amateurs.
SANCER-SHEPHERD & Co.,
5, 6 & 7, Gray's Inn Passage, Red Lion St., Holborn, London, W.C.
EVENING CLASS IN ELEMENTARY
COACHING (THEORY AND
MR. ALFRED C. CHAPMAN, F.L.C., SCHOOL OF AGRICULTURE,
JUNIOR LECTURER IN AGRICULTURE.
Applications are invited for the post of JUNIOR LECTURER in AGRICULTURE at the School of Agriculture, Ghizeh, under the Ministry of Public Instruction.
Candidates must be not less than 23 nor over 33 years of age, bave a robust constitution, and possess a University Degree or College Diploma in Agriculture. Preference will
be given to applicants having experience of Agricultural Practice and Teaching. In addition to Agriculture, the
Lecturer appointed will be required to teach elementary Agricultural This will commence on Monday, April 3rd next, and
Botany and Entomology. will consist of about sixteen meetings of two hours each.
Salary, £295 per annum (£Eg.24 per mensem), rising to £393 per annum
(£Eg.32 per mensem). Allowance for passage out to Egypt. The Course, whilst dealing more particularly with those organ
Applications, with full statement of qualifications, and accompanied by
copies only of testimonials, must be sent in before May 4, 1995, to w. Ć isms which are of importance in the Ferinentation Industries, MACKENZIE, Esq., D.Sc., Principal, School of Agriculture, Ghizeb, Egypt, will be found useful to Students who are preparing for the Final. to whom candidates may apply for further information. Examination of the Institute of Chemistry in Biological Che. mistry or in Branch “É.”
BOTANY TUTOR. Stipend, £300. For Syllabus and all further particulars apply to
WELL KNOWN COLLEGE. CHEMICAL LABORATORIES, 8 DUKE STREET, ALDGATE, E.C.
SCIENCE & MATHEMATICAL TUTORS. UNIVERSITY COLLEGE, LONDON.
A List of Easter Vacancies sent. (UNIVERSITY OF LONDON.)
Co., FACULTY OF MEDICINE.
80 Wigmore Street, Cavendish Square, London, w. The SUMMER SESSION begins on WEDNESDAY, APRIL 26.
(late 44 Old Bond Street). The work is arranged so that a Student may advantageously begin bis Medical Curriculum then.
FOR SALE.-The Instruments in the The Bucknill Scholarship and four Entrance Exhibitions will be awarded n October.
Observatory of the late Mr. Edward Crossley : a g-in. and a 4-is. Full information may be obtained from either of the undersigned.
(both photo-visual object glasses) Equatorial Refractor by Cooke;
3t-in. Transit Circle by Cooke ; a 6-in. Sextant and a 5-in. Transit SIDNEY MARTIN, M.D., F.R.S.,
Theodolite by Troughton and Simms; Siderial Clock by Cooke; Dean of the Faculty.
Parallel-wire and Double-image Micrometers by Troughton and WALTER W. SETON, M.A., Acting Secretary. Simms; Microscopes by Ross and Zeiss; Apparatus for Lectures on
Light, Polarisation, &c., by Harvey and Peak; Measuring Bars and
Rods-12-in., 40-in., 3-ft., 10-ft.-by Troughton and Simms; Standard PRACTICE
Barometer by Hicks; Two Spectroscopes; Two Controlled Clocks
Apply to Mr J. Gledhill, Bermerside, Halifax.
Skilled mechanic requires situation, Laboratory or Works. Especial Course of Instruction in THERAPEUTICS, PHARMA.
All round man, has had charge of metal and wood workshops, experiCOLOGY and MICROSCOPY for INSTITUTE OF CHEMISTRY
enced in electrical and general scientific apparatus. Can manufacture EXAM. Mr. FREDERICK DAVIS, The Laboratories,
same on commercial lines.-E. T. Cook, 23 Sandhurst Grove, Leeds (Registered in Column 8 (Advanced Education), Teachers Registration For Sale.-Extensive Collections of British Councii, Board of Education, S.W.),
Lepidoptera, Coleoptera, Tropical Butterflies, Cabinets, &c. Correcely 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C.
named type collections at very moderate 'prices.- Particulars from
A. FORD, Hillside, Sunnybill, Pokesdown, Bournemouth. The UNIVERSITIES of MANCHESTER, TYPE-WRITING
TYPE-WRITING UNDERTAKEN BY LIVERPOOL and LEEDS.
HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher The next MATRICULATION EXAMINATION will commence on Local, thorough acquaintance with Modern Languages). Research, Wednesday, July 5, 1905, and will be held simultaneously at the three Revision, Translation. Scale of charges on application. The Case Universities and in Schools approved by the Joint Matriculation Board.
bridge Type-writing Agency, 10 Duke Street, Adelphi, W.C The fee is due on or before June 3. Information as to Scholarships awarded on the results of this examination
THE NEW " DERMA" TUBE. and on other matters may be obtained from the undersigned.
(PATENT APPLIED FOR.) R. F. GWYTHER,
Telephone Secretary to the Joint Matriculation Board,
FOR PRODUCING "DERMA"-RAYS.
το 47. Owens College, Manchester.
Central TO SCIENCE, MATHEMATICAL AND
OTHER MASTERS.-Required (1) Mathematical Tutor for im. portant Training College. Salary, 3140, board and residence. (2) Mathematical Tutor for 1st Grade Public School. £120, board and residence. (3) Science Master for Grammar School, Lond. Univ. man preferred. [120, with residence. (4) Graduate for Mathematics and junior form work. £150, non-res. (5) 2nd Master for Science and Mathematics. £180, non-res. Particulars of the above and other
PRICE ON APPLICATION Sience posts will be sent on application. Candidates seeking posts for alter Easter are invited to apply forth witb. Address, Messrs. These rays are being
used with good results on the Continent Griffiths, Smith, Powell and Smith, Tutorial Agents and in America.
'The tubes can be worked with a compara (Estab. 1833), 34 Bedford Street, Strand, London, W.C. tively small coil.
The dei matitis is produced quicker a heals more rapidly
than that caused by an xoay tube. HANDSWORTH GRAMMAR SCHOOL,
Dr. Gu-tav Reus
says: "Our own experience with the Derma' radiation
proves that a marked but superficial derma NEAR BIRMINGHAM.
tatis is quickly produced by a short exposure to a Derma' tube, which is per The Governuts are prepared to APPOINT a HEAD MASTER, who
excellence the apparatus de choix in treating superficial cutaneous affectios
A. C. COSSOR, 54 Farringdon Road, London, E.C. must be a Graduate of sume University of the United Kingdom, to enter upon his duties as soon as possible. Stipend, £150 a year, with Capitation
GOLD MEDAL AWARDED ST. LOUIS EXHIBITION, 2004 fee of 62 per boy. Present number 140. Accommodation up to 200; no boarders.
SECOND-HAND Applications, with copies of not more than three recent testimonials, to be
TELESCOPES, &c.sent before April 17, 1005, 10 H. TRAVERS EDGE, Clerk to the Governors, 5 Waterloo Street, Birmingham.
6) in ALVAN CLARK, equatorial, much apparatus £150
$220 o prism SPECTROSCOPE by BROWNING
£20 MATHS. and SCIENCE. Attractive Appt. MICROSCOPES
Experienced and successful Army Tutor desires to meet with a Univ. POWELL & LEALAND, No. 3, much apparatus, £28 10s man with above qua's., able to take responsibility of Vice-Principal,
ZEISS IVa, ZEISS Vla
£14, £10 with view to, later, sharing profits, and a possible partnership. Age
February List, including many others, all kinds, post free 26 2. Sal ry, £159, res, or £200, non-res. Many other Science Appts. Write or call, NEEDES & SELLICKS, Clock House, Arundel C. BAKER, 244 HIGH HOLBORN, LONDON, W.C.