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FOR COLLEGES AND SCHOOLS.

IMPROVED PATTERN. ALL PARTS READILY VISIBLE. SILVER VALVES. This Press has been specially designed for the use of Teachers, &c., who desire to illustrate the great multiplication of force obtainable by utilising the laws of Hydrostatics alone; at the same time it will be found useful for experiments on regelation, &c., where pressures amounting to half-a-ton or upwards are required. Price £2 2s.

Catalogues of Apparatus and Chemicals post free. 14 COMMERCIAL STREET, LEEDS.

NEGRETTI & ZAMBRA'S
Latest METEOROLOGICAL INSTRUMENT.

THE

'Hyetograph'

Descriptive Pamphlet post free to all parts of the World.

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38 Holborn Viaduct,

London, E.C.;

BRANCHES:

45 Cornhill, E.C.;

AND

122 Regent St., W.

IMPERIAL COLLECE OF SCIENCE AND TECHNOLOGY,

SOUTH KENSINGTON, LONDON, S. W.,

including as integral parts

The ROYAL COLLEGE OF SCIENCE the ROYAL SCHOOL OF MINES, and the CITY AND GUILDS COLLEGE

Visitor-HIS MAJESTY THE KING.

Chairman-The Right Hon. the EARL OF CREWE, K.G. Rector-HENRY T. BOVEY, LL.D., M Inst. C.E., D.C. L., F.R.S. Secretary-ALEXANDER GOW, M.A., B.Sc.

The SESSION begins on OCTOBER 5, 1909, and ends on JULY 1, 1910. The Departments of the College are:

ROYAL COLLEGE OF SCIENCE-Mechanics and Mathematics, Physics, Chemistry, Botany, Zoology, Geology.

ROYAL SCHOOL OF MINES-Mining, Metallurgy.

CITY AND GUILDS COLLEGE-Mathematics, Civil and Mechanical Engineering, Electrical Engineering. Chemistry.

The fees average £35 a year.

SPECIAL COURSES of ADVANCED LECTURES will be given as
under (subject to change):
PHYSICS.-Colour Vision. (Sir William Abney, K.C.B., D.Sc., D.C.L.,
F.R.S.) Spectrum Analysis. (Asst. Prof. A. Fowler, A.R.C.S.,
F.R.A.S.) Physical Changes in the Cylinder of an Internal Com-
bustion Engine. (Dr. W. Watson, D.Sc., A.R.C.S.. FR.S) High
Temperatures and Optical Pyrometry. (Prof. H. L. Callendar, M.A.,
LL.D., F.R.S.) Radio-activity. (Prof. the Hon. R. J. Strutt, M.A,
F.R.S.) Magnetic Properties of Metals and Alloys. (Dr. S. W. J.
Smith, M.A., D.Sc., A.R.C.S.)

CHEMISTRY.-Gaseous Fuel and Combustion. (Prof. W. A. Bone,
D.Sc, Ph.D., F.R.S.)

BOTANY.-Timber: Its Structure, Defects, and Diseases. Timber for
Engineering Students. (Asst. Prof. Percy Groom, M.A., D.Sc.,
F.L.S.) Fungal Diseases of Plants, and their Remedies. (Mr. E. S.
Salmon, F. L.S.)
ZOOLOGY.-Marine Biology and Fisheries. (Dr. E. J. Allen, D.Sc.,
Director Marine Biol. Assocn.) Embryology. (Mr. Richard Assheton,
M.A.) Heredity, Variation, and Evolution. (Mr. A. D. Darbishire,
M.A.) Cytology and Protistology. (Mr. C. Clifford Dobell, B.A.,
Fellow of Trinity Coll., Cam.)

GEOLOGY-Economic Geology. (Prof. W. W. Watts, M.A., Sc.D.,

M.Sc., F.R.S., F.G.S.)

METALLURGY-Advanced Metallurgy of Copper, Gold, Silver, Lead, and Alloys. (Prof. W. A. Carlyle, Ma. E., M.I.M.M.) ENGINEERING.-Railway Engineering. (Prof. W. E. Dalby, M.A., B.Sc., M. Inst.C.E.; Mr. W. T. Stephenson, M.A.; Mr. H. G. Brown, M.I.E. E.; Mr. Philip Dawson, M. Inst.C.E., M.I.M.E., M.I.E.E.) The fees for the above range from £1 10s. to £4, except for the full courses in Metallurgy and Engineering (fees £5 to £10 and £20 respectively).

The Calendar may be obtained, price 6d., or post free gd., either directly or through any bookseller, from Messrs. Eyre and Spottiswoode, East Harding Street, London, E.C.

For special information apply to the SECRETARY, Imperial College of Science and Technology, Exhibition Road, London, S. W.

ST. BARTHOLOMEW'S HOSPITAL AND COLLEGE.

(UNIVERSITY OF LONDON.)

PRELIMINARY SCIENTIFIC CLASS.

SYSTEMATIC COURSES of LECTURES and LABORATORY WORK in the subjects of the Preliminary Scientific and Intermediate B.Sc. Examinations of the University of London will commence October 1, 1909, and continue till July, 1910.

Attendance on this class counts as part of the five years' curriculum.
Fee for the whole Course, £21; or single subjects may be taken.
There is a Special Class for the January Examination.

ENTRANCE SCHOLARSHIPS.

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The College is situated close to stations on the G.E.R., District Railway and L.T. and Southend Railway, and is approached from The Roya! Exchange in 15 minutes by motor omnibus.

PASS AND HONOURS COURSES in the FACULTIES OF ARTS, SCIENCE AND ENGINEERING. Latin, Greek, English, French, German, English History, Mathematics, Physics, Chemistry, Botany, Geology. CIVIL AND MECHANICAL ENGINEERING.

ELECTRICAL ENGINEERING,

Courses in the above subjects are likewise arranged for Evening Students.

PRELIMINARY AND MATRICULATION CLASSES.
MODERATE FEES.

Valuable Scholarships are offered annually by the Worshipful Company of Drapers. Calendar post free on application to the REGISTRAR, or

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Special arrangements for students undertaking research during vacations.
Full particulars at the Institute or sent on receipt of postcard.
REG. S. CLAY, D.Sc., Principal.

CITY OF LONDON COLLEGE.

ACTING IN CONJUNCTION WITH THE LONDON CHAMBER OF COMMERCE. WHITE ST., and ROPEMAKER ST., MOORFIELDS, E.C. (Near Moorgate and Liverpool Street Stations.) PRINCIPAL: SIDNEY HUMPHRIES, B. A., LL.B. (Cantab.) Michaelmas Term begins Monday, September 27.

EVENING CLASSES in SCIENCE. Well-equipped LABORATORIES for Practical Work in CHEMISTRY, BOTANY, GEOLOGY, and all branches of PHYSICS.

Special Courses for Conjoint Board, Pharmaceutical and other examinations. Classes are also held in all Commercial Subjects, in Languages and Literature. Art Studio. All Classes are open to both sexes. SATURDAY CLASSES for Chemistry and Physics.

DAY MODERN SCHOOL. Preparation for a COMMERCIAL of BUSINESS career or the CIVIL SERVICE. Prospectuses, and all other information, gratis on application.

DAVID SAVAGE, Secretary.

THE SIR JOHN CASS TECHNICAL
INSTITUTE.

JEWRY STREET, ALDGATE, E.C.
Principal-CHARLES A. KEANE, D.Sc., Ph. D., F.I.C.

EVENING CLASSES in CHEMISTRY, PHYSICS and MATHEMATICS designed to meet the requirements of those engaged in CHEMICAL and ELECTRICAL INDUSTRIES and in trades associated there with

Also preparation for the B.Sc. Examination of London University. Courses for Honours B.Sc. in Physics.

Chemistry

Physics Mathematics

CHARLES A. KEANE, D.Sc., Ph.D., F.L.C..
H. BURROWS, A.R.C.S., Ph.D., F.I.C., and
A. R. SMITH, M.Sc., F.I.C.

R. S. WILLOWS, M.A., D.Sc.
E. C. SNOW, B.A.

Every facility for Advanced Practical Work and Research in well-equipped laboratories both in the afternoon and evening. New Session begins Thursday, September 23

For details of the Classes apply at the Office of the Institute, or by letter to the PRINCIPAL.

SOUTH-WESTERN POLYTECHNIC INSTITUTE. MANRESA ROAD, CHELSEA, S.W.

Entrance Scholarship Examination, September 20, 10 a.m. Day Courses in preparation for London University degrees in Mechanical and Electrical Engineering, in Chemistry, Physics and Natural Science. Session Fee, 15. Similar Evening Courses. Session Fee, £3 10s. Technical Day Courses arranged to extend over 3 years and prepare or Engineering, Electrical, Chemical and Metallurgical professions. Mathematics

Physics

Chemistry...

Botany

Geology Zoology

Engineering Electrical

Engineering

*W. H. ECCLES, D.Sc.; J. LISTER, A.R.C.S. *S. SKINNER, M.A.; L. LowNDS, B.Sc., Ph.D., and F. W. JORDAN, B.Sc.

*J. B. COLEMAN, A. R.C.S. ; *J. C. CROCKER, M.A., D.Sc.; *F. H. Lowe, M.Sc., & W. E. OAKDEN. *H. B. LACEY; S. E. CHANDLER, D.Sc., and *H. J. JEFFERY, A.R.C.S.

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* Recognised Teacher of the University of London.

Full prospectus from the SECRETARY, post free, 4d.; at the Office, SIDNEY SKINNER, M.A., Principal

J. L. S. HATTON, M.A., Principal.

price 1d.

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British Constitution. G. H. J. HURST, M.A.
Assaying. Metallurgy. Mining. G. PATCHIN, A.R.S.M.
Prospectus free, Calendar 3d. (post free 5d.), from the Secretary.

KING'S COLLEGE, LONDON.
(UNIVERSITY OF LONDON.)

FACULTY OF SCIENCE (MEDICAL DIVISION).

Courses are provided in the Science Faculty for Medical Students in the Preliminary and Intermediate Studies-viz. Chemistry, Physics, Botany, Zoology, Anatomy, Physiology, Materia Medica, and Pharmacology.

The Classes are open to all Students, whether paying composition fees for the whole Course or paying fees for any separate subject.

COURSES FOR THE DEGREES OF THE UNIVERSITY.

1. Preliminary Scientific, Part I.-Fee 25 guineas.

2. Intermediate M.B., and Preliminary Scientific, Part II.-Fee 55 guineas.

3. Course for the Examination of the Conjoint Examining Board :-
First Examination-20 guineas.
Second Examination-55 guineas.

Advanced Classes in Anatomy and Physiology are also held.

Entrance, 1st, 2nd and 3rd Year Scholarships and Prizes of the value of £350 are offered for competition.

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UNIVERSITY COLLEGE OF NORTH

WALES (BANGOR).

SESSION 1909-10 will open on OCTOBER 5. DEPARTMENTS of MATHEMATICS, PHYSICS, CHEMISTRY, and BIOLOGY.

MATHEMATICS Prof. G. H. BRYAN, SC.D., F.R.S.

PHYSICS

CHEMISTRY...

BIOLOGY

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Assistant Lecturer, EDGAR R. HARPER, B.A. Prof. E. TAYLOR JONES, D.Sc.

Assistant

Lecturers and Demonstrators, A. H. FERGUSON, B.Sc., and W. E. WILLIAMS, B.Sc. Prof. K. J. P. ORTON, M.A., Ph.D.

Assistant Lecturers and Demonstrators, Miss A. E. SMITH, B.Sc., and J. O. HUGHES, B.Sc.

Botany-Prof. R. W. PHILLIPS, M.A., D.Sc.

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Assistant Lecturer and Demonstrator, J.
LLOYD WILLIAMS, D.Sc.

Zoology and Physiology-Prof. PHILLIP J. WHite,
M.B., F.R.S.E.

The Classes and Laboratory Courses of this College are arranged to suit the requirements of Students of Practical Science, as well as of Students preparing for University and other Examinations. The Lectures in Chem. istry, Physics, Botany, and Zoology are recognised for the first year of medical study.

The extensive Laboratories (Physical, Chemical, and Biological) are fully equipped for Study and Research.

Inclusive Tuition Fee, L1 15. Laboratory Fees (per Term) on the scale of £1 15. for six hours a week, in each Department.

A considerable number of Scholarships and Exhibitions are open for com. petition at the beginning of cach Session, and several are awarded at the close of each Session on the result of the year's work.

For full information as to Courses, apply for Prospectus to the Secretary and Registrar, J. E. LLOYD, M.A.

UNIVERSITY OF LONDON.

UNIVERSITY COLLEGE.

STATISTICAL AND BIOMETRICAL LABORATORY (assisted by a Grant from the Worshipful Company of Drapers), and the

FRANCIS GALTON LABORATORY for NATIONAL EUGENICS, Under the direction of Prof. KARL PEARSON, M.A., F.R.S.

The Laboratory is open from 9.30 to 5.30 daily, and provides a complete course of training, not only in the theory, but in the practice of Statistics. Instruction is given in the exhibition, calculation (mechanical and arithmetical), and treatment of statistical quantities.

Advanced students will be assisted in research work suited to their stage of progress.

The Laboratory possesses a large collection of statistical models and diagrams, and of mechanical integraters and calculators.

Lectures, £6 6s. per Session; Practical work, £6 6s.; Research students, £2 25. per term.

Short courses are provided in the Eugenics Laboratory for those engaged in social, medical or anthropometric work of a statistical character. Professor Karl Pearson will meet intending students on Tuesday, October 5, between 10 a.m. and I p.m.

For further particulars apply to the SECRETARY, University College, London (Gower Street).

ROYAL SOCIETY.

SORBY RESEARCH FELLOW.

The Committee representing the Royal Society and the University of Sheffield appointed to administer the Sorby Research Fellowship Fund will proceed to the election of a Fellow early in November next. The object of the Fellowship is not to train men for original research, but to obtain advances in natural knowledge by enabling men of proved ability to devote themselves to research. The appointment will be for five years,

THE MUSPRATT LABORATORY OF PHYSICAL subject to regulations, a copy of which may be obtained on application to

AND ELECTRO-CHEMISTRY.

UNIVERSITY OF LIVERPOOL.

This Laboratory is specially fitted and equipped for study and research in Pure and Applied Electro-chemistry. Electric current (direct or alternating) up to 1000 amperes, and power up to 80 kilowatts are available, enabling all classes of electrolytic and electrothermal work to be carried out. Special Lecture and Laboratory Courses in Pure and Applied Electro-chemistry are held every year, beginning in October. Fee for research students, £3 per annum. Further information may be obtained from the undersigned, P. HEBBLETHWAITE, Registrar.

CITY OF LONDON SCHOOL. WANTED, a SENIOR CHEMISTRY MASTER, whose age should not exceed 35. Salary, £300 a year, increasing to £450. Forms of appli cation can be obtained from A. J. AUSTIN, Secretary, at the School, Victoria Embankment, E.C., to whom the forms, duly filled up, and accom. panied by a copy of testimonials as to qualifications and character, must be returned not later than Saturday, October 16. Selected candidates will be communicated with.

the Royal Society. The emoluments of the Fellow will be £500 per annum. The Fellow elected will be expected to pursue his investigations at the University of Sheffield unless the nature of the investigation requires that the work should be done elsewhere; he will be expected to enter upon his duties as soon after election as possible.

Applications from candidates for the Fellowship will be received by the Secretaries of the Royal Society, at Burlington House, London, W., up to September 30. Each application should contain a brief statement of the scientific career of the candidate, including his previous work, and a statement, as precise as possible, of the nature of the work to which he proposes to devote himself if elected. Each candidate is requested to send one reference, but testimonials are not desired.

THE UNIVERSITY OF SHEFFIELD.
Courses are held and Degrees are awarded in the following Faculties:-
ARTS, PURE SCIENCE, MEDICINE, LAW, APPLIED
SCIENCE (including Engineering, Metallurgy and Mining).
ALL COURSES ARE OPEN TO MEN & WOMEN STUDENTS
ALIKE.

The SESSION 1909-10 commences OCTOBER 6, 1909.
Prospectuses giving full information may be obtained free from

W. M. GIBBONS, Registrar.

BEDFORD COLLEGE FOR WOMEN.

(UNIVERSITY OF LONDON.)

YORK PLACE, BAKER STREET, LONDON, W.
PRINCIPAL-MISS M. J. TUKE, M.A.

Lectures are given in preparation for all Examinations of the University of London in Arts, Science and Preliminary Medicine; for the Teacher's Diploma, London; the Teacher's Certificate, Cambridge; and for the Cambridge Higher Local Examination.

Six Laboratories are open to Students for practical work.

There is a special course of SCIENTIFIC INSTRUCTION IN HYGIENE designed to furnish training for Women Factory and Sanitary Inspectors, and Teachers of Hygiene.

The ART SCHOOL may be attended by students who are not taking other subjects at the College.

A single course in any subject may be attended.

Regular Physical Instruction is given free of cost to students who desire it by a fully qualified teacher.

RESIDENCE.

Accommodation for about 40 resident students is provided in the College. The College has opened as an additional residence South Villa, Regent's Park, where further accommodation for 15 students is provided. South Villa is about five minutes' walk from York Place, and has large gardens available for students of the College.

Full particulars on application to the PRINCIPAL at the College.

DEPARTMENT FOR PROFESSIONAL TRAINING
IN TEACHING.

HEAD OF THE DepartmenT-MISS MARY MORTON, M.A. The Course includes full preparation for the Examinations for the Teaching Diplomas granted by the Universities of London and Cambridge. Students are admitted to the Training Course in October and in January. One Free Place (value £26 5s.), one Scholarship of the value of £20, and a limited number of grants of 10, are offered for the Course beginning in January, 1910.

They will be awarded to the best candidates holding a degree or its equivalent in Arts or Science. Applications should be sent to the HEAD OF THE DEPARTMENT not later than December 1.

BOARD OF EDUCATION, AUCKLAND,

NEW ZEALAND.

Immediate applications are invited for the following appointments:1. ASSISTANT DIRECTOR of TECHNICAL EDUCATION and MANUAL TRAINING.

Salary, Three hundred and fifty pounds (350) per annum, rising by twenty pounds (£20) yearly to five hundred (500). Engagement for at least three years, second-class passage paid.

2. CHIEF LADY INSTRUCTOR of the DOMESTIC DEPART. MENT of the AUCKLAND TECHNICAL COLLEGE. Salary, two hundred pounds (200) per annum for at least three years, second-class passage paid.

3. ENGINEERING WORKSHOP INSTRUCTOR at the AUCK LAND TECHNICAL COLLEGE.

Salary, two hundred pounds (200) per annum for at least three years, second-class passage paid.

Further particulars relating to any of the above appointments can be obtained by sending stamped addressed envelope to the undersigned, c/o The High Commissioner for New Zealand, 13 Victoria Street, London, S.W.

Applications close SEPTEMBER 30.

GEORGE GEORGE, F.I.C., F.C.S.,
Director of Technical Education and Manual Training.
Auckland, N.Z.,
July 28, 1909.

MERCHANT VENTURERS'
TECHNICAL COLLEGE

(in which the Faculty of Engineering of the University of Bristol

is provided).

PRINCIPAL AND DEAN OF THE FACULTY:

PROF. J. WERTHEIMER, B.Sc., B.A., F.I.C., F.C.S. MECHANICAL

ENGINEERING Prof. J. MUNRO, M.I.Mech.E., A.R.C.S.

CIVIL ENGINEERING Prof. R. M. FERRIER, M.Sc., M. Inst. C. E.

ELECTRICAL

ENGINEERING Prof. D. ROBERTSON, B.Sc., A.M.I.E.E.

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ASTRONOMY AND SURVEYING.

A General Course of Lectures on ASTRONOMY will be given by Professor KARL PEARSON, F.R.S., on Tuesdays and Thursdays at 4, beginning on October 7.

A Course of Practical Work in ASTRONOMY (one or two evenings a week) is arranged in the College Observatories for those following the above Class, or others desiring special instruction.

Junior and Senior Courses in SURVEYING, conducted by Mr. M. T. ORMSBY, M.Inst.C.E.I.. will begin on October 9. These Courses wil take the form of Field Work in the Third Term and Summer Vacation respectively.

Particulars on application to the undersigned.

WALTER W. SETON, M.A., Secretary, University College, London (Gower Street).

ROYAL AGRICULTURAL COLlege, CIRENCESTER.

FOUNDED 1845. REORGANISED 1908. Patron-H.M. KING EDWARD VII. Chairman-LORD MORETON. Vice-Chairman-Earl BATHURST, For Land-owners, Land Agents, Surveyors, Agriculturists, Intending Colonists, &c. Farming and Colonial Branch. Estate Management and Forestry Branch. For Prospectus of Curriculum, Fees, Entrance Exhibitions, Scholarships, Diplomas, &c., apply to the PRINCIPAL. Next Term begins October 5. An Entrance Scholarship of £75 and an Entrance Exhibition of £20 will be competed for in October.

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JOHN LUCAS WALKER STUDENTSHIP. Applications for this Studentship, the holder of which shall devote himself (or herself) to original research in Pathology, are invited, and should be sent not later than September 27, 1909, to Professor WOODHEAD, Pathological Laboratory, The Museums, Cambridge, to whom, also, applications for further information concerning the Studentship may be addressed. The Studentship is of the annual value of £200 (grants may also be made for assistance and apparatus), and is tenable, under certain conditions, for three years from October 12, 1909.

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Applications should be sent in covers marked "C. A." to THE SECRE TARY, Beard of Education, Whitehall, London, S. W., from whom further particulars may be obtained.

COUNTY BOROUGH OF SMETHWICK. EDUCATION COMMITTEE.

PRINCIPAL OF TECHNICAL SCHOOL. The above Committee require immediately a Principal for their Technical School. Commencing salary, £250 per annum, rising by fixed amounts of £25 annually to £350. The gentleman appointed will not be allowed to undertake any other duties without the consent of the Committee. Application form and particulars of duties may be obtained from the undersigned on receipt of a stamped addressed envelope or wrapper. All applications must be received by Tuesday, September 28, 1909. (Signed) ARTHUR H. SEARS, Secretary to Committee.

Council House,

Victoria Park, Smethwick. September 14, 1909.

NOW READY. Medium 8vo.

Price 12s. 6d. net (Inland postage 6d.). With 5 Plates and 83 Figures in the Text.

RESEARCHES ON FUNGI.

An Account of the Production, Liberation, and Dispersion of the Spores of Hymenomycetes treated Botanically and Physically. Also some Observations upon the Discharge and Dispersion of the Spores of Ascomycetes and of Pilobolus

By A. H. REGINALD BULLER, B.Sc. (Lond.), D.Sc. (Birm.), Ph.D. (I eip.), Professor of Botany at the University of Manitoba.

LONCMANS, CREEN & CO., 39 Paternoster Row, London.

MAN

An illustrated monthly record of Anthropological Science, 1/- per part, 10/- a year, post free anywhere.

PRINCIPAL CONTENTS SEPTEMBER ISSUE. ORIGINAL ARTICLES: Note on the Bandar Cult of the Kandyan Sinhalese. Dr. C. G. SELIGMANN.-String Nets of the XVII Dynasty. W. M. F. PETRIE.-Some recent Indian Palæolithic Implements. H. W. SETONKARR.-Exogamy. A. LANG.-REVIEWS: Wis enschaftliche Ergebnisse meiner ethnographischen Forschungsreise in den Südosten Deutsche-Ostafrikas.-The Threshold of Religion.-Die vor- und Frühgeschichtlichen Altertumer Thuringens.

London: The Royal Anthropological Institute, 3 Hanover Square.

A B C

Price 3s. net.

FIVE-FIGURE LOGARITHMS
FOR GENERAL USE.

By C. J. WOODWARD, B.Sc.
New and Enlarged Edition, 1909.

London: E. & F. N. SPON, 57 Haymarket.

BRITISH DESMIDS:

A Supplement to British Fresh-Water Algæ.
By Dr. M. C. COOKE.

In one vol. of 205 pp., with 66 finely coloured plates of over 300 figures, 8vo, green cloth gilt (1887), price £1 10s. net.

Or in the 10 original parts (pub. at £2 12s. 6d.), price £1 85. net. (Postage United Kingdom 5d. extra, Foreign cd. extra.) JOHN WHELDON & CO., 38 Great Queen Street, London, W.C.

AERIAL NAVIGATION. Mr. Eric Stuart

BRUCE, M.A., Oxon., F.R. Met. Soc., Member of Council and late Honorary Secretary Aeronautical Society of Great Britain. VicePresident Aerial League of the British Empire, Membre d'Honneur Aéro Club of France, can accept engagements for his eminently successful lecture, "AIRSHIPS, BALLOONS, AND FLYING MACHINES,' profusely illustrated by elaborate experiments and working models, also for shorter demonstrations at Soirées, Exhibitions, &c. Now booking for Winter Season For prospectus, terms, &c., address E. S. BRUCE, Esq., Airth, Sunningdale, Ascot.

TYPE-WRITING

UNDERTAKEN BY HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher Local). Modern Languages. Research, Revision, Translation, Shortband. Dictation Room. The Cambridge Type-writing Agency, 10 Duke Street, Adelphi, W.C.

TYPEWRITING.-Scientific MSS. typed by experienced

Typists. Perfect accuracy. 1od. per thousand words. Testimonials duplicated from 38. per hundred copies. General typing.-THE WEST LONDON TYPEWRITING BUREAU, 30 Rivercourt Road, London, W.

B.Sc. (Lond.), Honours in Chem., also trained in Germany, desires partnership or appointment in works, or with analyst, or as research assistant. French and German spoken. Capital at command. Agents ignored.-Box 2081, c/o NATURE. NATURE-STUDY. Instructive, interesting cases. Approval selections. Lists.-FORD, Entomologist, Stourwood, Bournemouth. MOSQUITOES, GNATS and FLIES will

not attack if a little of Ambrecht's Pyrethrum is put on the skin. It protects for about 12 hours, and also cures stings of any insects-wasps and bees included. Price 2s. 9d. post free U.K.; Germany, Holland and English Colonies 1s., France and Italy 15. 6d., extra.—Armbrecht, Nelson & Co., 71 and 73 Duke Street, Grosvenor Square, London, W.

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"THE intensity of Sound depends upon the force which makes it, infinitesimal particles of moving matter, undoubtedly electrical, aroused by the shock, upon which also depends the length of the vibra tions, which themselves otherwise are controlled by the character of the body in which they take place; and these vibrations of a particular body, that is, of each particular body, are the machinery which decide the character of every Sound.

"And thus the different brands are formed, similarly as the different kinds of lumber, as boards, plank, staves, are made by a saw-mill; or different kinds of goods in any factory although neither the lumber from which the boards are made, or the cotton or linen, or any other material from which such things are made, is made by the mill. These come from the outside.

"Every hard body will produce Sound when struck by another hard body. Most of these sounds are instantly scattered, but certain instruments are in their nature sound-containing, just as there are certain bodies, as oceans, lakes, or ponds, water-containing; and others as suns, stars, lamps, or candles, light-containing. And as the waterproducing bodies consist of those which contain deposits of water; or light-producing ones, those which have deposits of light, however these be made; so sound-producing instruments consist of those which in some way have deposits of sound.

"But all water, however it may be stored or carried, is composed of oxygen and hydrogen, a mixture of matter in certain proportions; so all light and all sounds, as well as everything else in the material universe, are made from matter. For although fluids or gases appear quite differently from solid substances, the laws of their combination are similar, that is, they are all composed of matter. And therefore, the differences of sounds, like those of odours, and everything else in the material universe, must consist in the materials from which they are made, and the manner these are mixed. This law is a very simple one that every scientist should understand."

ARTHUR F. BIRD,

22 BEDFORD STREET, STRAND, LONDON. Agency for American Books.

or American Publishing Company, Middlebury, Vt., U.S.A.

JUST PUBLISHED.

ELEMENTARY PHOTO-MICROGRAPHY."

SECOND EDITION.

Enlarged, Revised and brought Up to Date. By WALTER BAGSHAW.

45 Illustrations.

Every Microscopist should be in possession of this valuable little work.

The Lancet." Every microscopist should know how to take 2. photo-micrograph. In Mr. Bagshaw's little book he will find every instruction necessary.'

Cloth Bound 2/6 net. Post free 2/9

ILIFFE & SONS, LIMITED, 20 Tudor St., London, E.C.

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