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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
Monocular, £15; Binocular, £18

Trypanosoma Brucei (Sleeping Sickness).
Human Spinal Cord-prepared by Golgi's method

4 0 Watson's well-known Van Heurck and Edinburgh Student's Micro

Beautiful Polyzoa-Cristatella mucedo, with Slatoblasts

30 scopes have been re-modelled in the Stage and Foot, and give even Celenterata-Campanularia, Obelia, Clytia, and many others, greater convenience for working than before.

each The Watson-Conrady Condenser System is of new computation, and

Exquisite arranged groups composed of Diatoms. Splculës, &c", is expressly designed for Photo-Micrography.

according to size, from

5/- 10 210

Scales and Hairs of Insects arranged to represent Sprays, New Aplanatic Magniflers. New Objectives. Everything Bouquets, and Vases of Flowers, always interesting and

attractive...

7/6, 15/-, 21/. and 42 for the Microscopist.

Write for Catalogue No. 3 of Micro. Objects, together with nealy For all the above see Watson'S 158-page Catalogue of Microscopes, sent published supplementary list of Slides, giving details of recenils

added specimens, post free (SPINTHARISCOPE for observing the Scintillations of Radium. The very best. Price 21/SPECIALITIES:- STRUTT'S RADIUM CLOCK. Price according 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,

& SONS, 313 HIGH HOLBORN, LONDON, W.C. ESTABLISHED 1837.

BRANCH-16 Forrest Road, Edinburgh.

post free.

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Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Streer, in the City of London, and push

AND Co., LATED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 06 Fifth Avenue, New York, - THURSDAY, Marchio

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE

To the solid ground
Of Nature trusts the mind which builds for aye."-WORDSWORTH.

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sex.

COUNTY OF LONDON.

NORTHERN POLYTECHNIC
EDUCATION ACTS, 1870 TO 1903.

INSTITUTE,
The London County Council invites applications for the following

HOLLOWAY, LONDON, N. ap. ointments in the Education Department:

FOUR DIVISIONAL INSPECTORS, who will have the general (Close to Molloway Sın., G. N.R., and lighbury Stn., 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 duties will be to

DEGREES. inspect pupil teachers' centres, secondary schools, training colleges, science

Day and Evening Courses in the above under recognised teachers isand 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 :-(i) English language and

PHYSICS, literature ; (2) Modern languages; (3) Mathematics and Science ; (4) Tech

CHEMISTRY, nology (including mechanical and electrical engineering). The salary will be in each case 660 a year, rising by annual increments of £25 to a

ENGINEERING. maximum salary of £800 a year.

Separate Laboratories for Elementary, Advanced and Honours stedents, 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 £400 a year, rising by annual increments of 620 to a maximum salary of £500 a year.

Accommodation and apparatus provided for research in either Pure » ONE INSPECTOR of woOD and METAL WORK, whose chief Applied Cheinistry and Physics, and Engineering, in rooms speca 'y 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. S. 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 SCIENCE, ARTS, MEDICINE, COMMERCE. be 6300 a year, rising by annual increments of £20 to a maximum salary of £400 a year.

SPECIAL SCHOOL OF MODERN LANGUAGES. The persons appointed will be under the control of the Chief Inspector,

DEPARTMENT FOR TRAINING OF TEACHERS. and will be required to give their whole time to the duties of the office, and

Scbools ofwill in other respects be subject to the usual conditions attaching to the Council's service, particulars of wbich 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 WOMEN 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 accompanied by In the Medical School there is a separate Dissecting Room for Wome copies of not more than three recent testimonials.

with a qualified Woman Demonstrator, Canvassing, either directly or indirectly, will be held to be a disqualifi. cation 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. Spring Gardens, S.W.,

Syllabuses with all information will be sent on application to the

SECRETARY. March 2, 1905.

THE SIR JOHN CASS TECHNICAL

INSTITUTE,
JEWRY STREET, ALDGATE, E.C.

A Course of Twelve Lectures and Demonstrations on
President :

PHYSICAL CHEMISTRY
Dr. R. T. GLAZEBROOK, M.A., F.R.S.,

will be given during the Summer Term by
Director of the National Physical Laboratory.

G. SENTER, B.Sc., Ph.D.,
V'ice-Presidents:

Lecturer on Chemistry at SIR WM. DE WIVELESLIE ABNEV, K.C.B., D.C.L., F.R.S.

St. Mary's Hospital Medical Scho

The Lectures and Demonstrations will be held on Wednesday THE RIGHT HON. THE LORD BLYTHSWOOD.

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 ass lie

Astronomer Royal. those engaged in Chemical and Electrical industries, who desire to obtam a The Right Hon. THE EARL OF CRAWFORD, K.T., LL.D., F.RS. 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 candidates for the sun

B.Sc. examination of London University,
The Hon. ALBAN G. H. Gibbs, M.A., M.P..

A Course of Laboratory Work in connection with the lectures 1
Master of the Worshipful Co. of Spectarte Makers.

be held on Wednesday afternoons. Sir HOWARD GRUBB, F.R.S.

A detailed Syllabus may be had upon application at the Office 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 Governing Body The Right Hox. THE EARL or Rosse, K.P., D.C.L., F.R.S. THE 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. 'l he object of the Convention is to bring into co-operation those interested in Optical Matters, from all sides of the question, theoretical, practical, and commercial.

Short Courses suitable for the Intermediate and Final B.Sc. Eu.. The morning, will be devoted to papers and discussions on Optical tions of London University will be conducted by Teachers recognised by 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 dion EXHIBITION OF OPTICAL & SCIENTIFIC INSTRUMENTS during the Easter vacation) to the Isle of Wight, for tbe study of of British manufacture, in the large hall of the Northampton Institute,

Geology of the Island; also Museum Demonstrations and Fx. 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 u eful work of reference in regard to instruments manufactured in this country BOTANY.-T. G. Hill, A.R.C.S., F.L.S. A Sammer Course The Subscription for Membership of the Convention will be five

Practical Plant Physiology and Ecology, with suitable Excursies te shillings. Applications for inembership should be a dressed to the Hon. Sec., Mr. F. J. SELBY, MA., Elm Lodge, Teddington,

the Study of Plant Relationships. Saturdays, o to, co Middlesex, who will be glad to furrish fur: her particulars is desired.

April 8. ADMISSION to the Exhibition, daily, ONE SHILLING, For particulars, apply to the Head of the Natural Science Departe

after 7 p.m., Sixpence. Tickets admitting to the Exhibition at any time while it is open, 26.

For other Scholastic Advertisements, ses page cxcix.

OPTICAL CONVENTION, 1905.

BROWNING’S SPECTROSCOPES.

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The STUDENT'S SPECTROSCOPE has a prism of extremely dense glass, of very superior workmanship; the circle is divided, and reads with a vernier to single minutes; the slit is furnished with a reflecting prism, by means of which two spectra can be shown in the field of view at the same time. The instrument will divide the D line in the Solar Spectrum, or the yellow Sodium lines distinctly. With a slight alteration of the adjustments, the instrument can be used for taking the refractive and dispersive powers of solids or liquids. The student's Spectroscope is the best instrument for the

Laboratory and for all general work in Spectrum Analysis. Complete in Cabinet

£7 0 0 With Tangent Screw Motion to Vernier, Rack to

Telescope, and extra-power Eyepiece, in Cabinet £8 16 0
Larger Model of the above Tangent Screw Spectroscope,
with 2 Prisms, in Mahogany Cabinet with Drawer £15 0 0

ILLUSTRATED CATALOGUE OF SPECTROSCOPES AND SPECTROMETERS, POST FREE.
HOW TO WORK WITH THE SPECTROSCOPE. A Manual of Practical
Manipulation with Spectroscopes of all kinds, with Twenty Engravings and Diagrams. By
JOHN BROWNING, F.R.A.S., F.R.M.S., &c. Price Sixpence. Post Free Sevenpence.

...

JOHN BROWNING, 78 Strand, London, W.C. PHOSPHORESCENT

LIQUID AIR AND LIQUID HYDROGEN. DIAMONDS

Specially selected for use with Radium Beta Rays, Ultra-violet

Light, Sunlight, or Magnesium Light.
ROUGH FRAGMENTS, 5/- each, mounted on black ground with

false gem for comparison.

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.

DIAMOND SCREENS, 15/- each

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.
For use with any Pocket Magnifier or Scintilloscope.
GLEW'S SCINTILLOSCOPE, with Pitchblende and

Polonium, 7/6 each.
F. HARRISON GLEW, 156 Clapham Road, London, S.W.
ALUMINIUM RECTIFIERS.

For charging any class
of Accumulators, direct
from alternating mains.
Works on any periodicity
or voltage. Action abso.
lutelyinfallible. No moving
parts. High efficiency.
Requires no attention.

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Made in Four sizes, to charge

from to 6 Amperes,
17s, 6d. to £8 8s.

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For PARTICULARS WRITE

OR CALL

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1/10" 1/12"

OF THE HIGHEST POSSIBLE OPTICAL EXCELLENCE.

Apochromatics. " N.A., 1.30, oil immersion

£8 8 0 1.40

10 10 0 1/12" 1.40

8 8 0 Pan-Aplanatics. 1" oil immersion, N.A., 1.30

4 0 0 1.30

4 0 0 1.30

5 5 0
Dry Series Pan-Aplanatics.
I" N.A., 0.30 ...
£2 5 0 " N.A., 0.80

1 16 0
0.50
2 0 0

0.88

2 17 0
0.30
1 4 0

0.92

оо 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.

EVENING CLASS IN ELEMENTARY
MICROSCOPY & BACTERIOLOGY.

ALSO

COACHING (THEORY AND

MR. ALFRED C. CHAPMAN, F.I.C., SCHOOL OF AGRICULTURE,
Desires to announce that, assisted by

GHIZEH, EGYPT.
MR. F. G. S. BAKER, M.A.,

JUNIOR LECTURER IN AGRICULTURE.
He will conduct an

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 annun (£Eg.32 per mensem). Allowance for passage out to Egypt.

Applications, with full statement of qualifications, and accompanied by The Course, whilst dealing more particularly with those organ. copies only of testimonials, must be sent in before May 4, 1905, 1o W. Ć isms which are of importance in the Fermentation 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.

BOTANY TUTOR. Stipend, £300. mistry or in Branch “ É.” 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.)

ORELLANA

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 his 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 41-is. Full information may be obtained from either of the undersigned.

(both photo-visual object glasses) Equatorial Refractor by Cooke; a

3t-in. Transit Circle by Cooke ; a 64-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
Barometer by Hicks; Two Spectroscopes; Two Controlled Clocks-

Apply to Mr J. GLEDHILL, Bermerside, Halifax.
In BIOLOGY, BOTANY, CHEMISTRY and PHYSIOLOGY for
MEDICAL EXAMS.

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 Sandburst 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 Correctly 49 and 51 IMPERIAL BUILDINGS, LUDGATE CIRCUS, E.C.

named type collections at very moderate 'prices.- Particulars froon

A. FORD, Hillside, Sunnybill, Pokesdown, Bournemouth. The UNIVERSITIES of MANCHESTER, 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 Cse 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,

FOR PRODUCING "DERMA-RAYS.

Telephone Secretary to the Joint Matriculation Board,

10547 Owens College, Manchester.

Central TO SCIENCE, MATHEMATICAL AND

OTHER MASTERS.-Required (1) Mathematical Tutor for im. portant Training College. Salary, 6140, 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 Science posts will be sent on application. Candidates seeking posts for after Easter are invited to apply forthwith. Address, Messrs. These rays are being

used with good results on the Continen Griffiths, Smith, Powell and Smith, Tutorial Agents and in America.

'I he tubes can be worked with a compara (Estab. 1833), 34 Bedford Street, Strand, London, W.C. tively small coil.

The dermatitis is produced quicker and heals more rapidly

than that caused by an X-ray 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 a

excellence the apparatus de choix in treating superficial cutaneous affections The Governors are prepared to APPOINT a HEAD MASTER, who

A. C. COSSOR, 54 Farringdon Road, London, E.C. must be a Graduate of some 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, 1905, 10 H. TRAVERS Edge, Clerk to the Governors,

64 in. ALVAN CLARK, equatorial, much apparatus £150 5 Waterloo Street, Birmingham.

6 in. COOKE,

do.
do.

$220 6 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, £28 105 man with above quals., 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 26-52. Salary, £150, 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.

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