Special display for Teachers and Students on Saturdays. Open till 7 p.m.

RICHARDS' SHOW ROOMS,

3 Beauchamp Place, Brompton Road, South Kensington, London, S. W.

MICROSCOPICAL PETROGRAPHY.

Gentlemen interested in the above study are invited to send to JAMES R. GREGORY & CO.,

I Kelso Place, Kensington Court, London, W., for a Prospectus of

THE TWENTIETH CENTURY ATLAS OF MICROSCOPICAL PETROGRAPHY,

now being issued in Twelve Monthly Parts, each Part containing Four Fine Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.

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
OF THE UNITED KINGDOM.
THE LABORATORY, PLYMOUTH.

The following animals can always be supplied, either living or preserved by the best methods ::

Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcyonium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella; Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone, Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c. For prices and more detailed lists apply to Biological Laboratory, Plymouth.

THE DIRECTOR.

THE NEW COLLECTION OF

336 SPECIMENS AND SLIDES OF ROCKS,

according to H. ROSENBUSCH: "Elemente der

Gesteinslehre, 2d ed. 1901."

Accompanied by a text-book: "Practical Petrography," giving a short description of the polarizing microscope and its application, and also of the macroscopical and microscopical features of every specimen of this collec tion, by Professor Dr. K. Busz of the University of Münster. This collection is intended for the practical use of students, and contains typical representatives of all important types of rocks; it is composed of 277 massive rocks (94 deep-seated rocks, 50 dike rocks, 133 volcanic rocks), 28 sedimentary, and 31 crystalline schists. Out of it two smaller collections of 250 and 165 specimens have been selected. The prices are as follows:Collection

I.

336 Specimens of Rocks Ia. 336 Slides ...

380 Marks.

RHENISH MINERAL OFFICE, BONN-ON-RHINE, GERMANY. ESTABLISHED 1833.

WATKINS & DONCASTER,

Naturalists and Manufacturers of

CABINETS AND APPARATUS

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
BRANCHES OF NATURAL HISTORY.

SPECIAL SHOW-ROOM FOR CABINETS.

N. B. For Excellence and Superiority of Cabinets and Apparatus, refer-
ences 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.)

New Catalogue (102 pp.) just issued, post free.

ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES.

25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy.

A large stock of Minerals, Rocks, Fossils and Microscopic Objects for
selection. Specimens sent on approval.
Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped
Boxes, Models of Crystals, &c., &c.

NEW CATALOGUE POST FREE.

THOMAS D. RUSSELL, 78 Newgate St., London, E. C.

Yearly
Half-yearly
Quarterly

SUBSCRIPTIONS TO "NATURE."

PHUSIS," LONDON.

CHARGES FOR ADVERTISEMENTS. £ s. d. 2 6 O O 9

£ s. d.

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8 o

Quarter Page, or Half a Column 1 15 O Half a Page, or a Column 3 5 Whole Page 6 6

No. 1870, VOL. 72]

Registered as a Newspaper at the General Post Office.]

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[PRICE 15 CENTS

[All Rights are Reserved.

ELECTRIC LANTERN.

Price Lists Free.

5067 New Iron-Body Lantern, with brass front, fitted on nahogany board, 4-in. double Condenser, best full-size achromatic Front Lens, and "Newtonian" Hand-Feed Arc Lamp. Complete in Case £10 10s. & CO.,

NEWTON

OPTICIANS TO HIS MAJESTY THE KING AND H.R.H. THE PRINCE OF WALES AND THE GOVERNMENT, 3 FLEET STREET, LONDON.

PHOTOGRAPHIC LENSES.

Special Pamphlet.

W.

G. PYE & CO.,

SCIENTIFIC INSTRUMENT MAKERS,

GRANTA WORKS, CAMBRIDGE.

NEGRETTI & ZAMBRA'S

LONG RANGE BAROMETERS

THE DIAGONAL BAROMETER.-In this instrument the tube is much longer than usual, and at the point on the vertical column where in ordinary Mercurial Barometers the 28 inches would be marked, the tube is bent at an angle and the remaining 3 inches of the scale-viz.: 29, 30, and 31are extended over a tube 36 inches long.

The mercury now moving diagonally instead of vertically, travels over 12 inches of the tube to every inch on the ver tical scale.

The slightest variation, even or" to which the scale is divided, is at once noticeable and can be easily read without the aid of a vernier or magnifier.

Further Particulars and Prices of this and other long range Barometers sent on application to the Manufacturers. NEGRETTI & ZAMBRA,

38 HOLBORN VIADUCT.

BRANCHES: 45 CORNHILL, AND 122 REGENT STREET,

ATTENDANCE. For the Course.

Physics...

For one year.

In Anatomy, Practical Anatomy and Physiology for three years, with single attendances at the Courses in Practical Physiology, Organic Chemistry (Preliminary Scientific, Part II.) and Pharmacology and Materia Medica.

(Anatomy and Phy£3 35. per subject. } For three months.

siology).

Other subjects. } £4 45. per subject. } For the Course.

(B) FOR COURSES FOR EXAMINATIONS BY THE CONJOINT BOARD.

Mathematics

Botany

Zoology.

...

J. E. MACKENZIE, Ph.D., D.Sc H. WREN, Ph.D., B.A., B.Sc.

ALBERT GRIFFITHS, D.Sc.

D. OWEN, B.A., B.Sc.

B. W. CLACK, B.Sc.

E. H. SMART, M.A.

W. G. BIRT, B.A., B.Sc.

A. B. RENDLE, M.A., D.Sc.

F. E. FRITSCH, Ph.D., B.Sc. H. W. UNTHANK, B.A., B.Sc. Geology & Mineralogy GEO. F. HARRIS, F.G.S. Assaying, Metallurgy & Mining. GEO. PATCHIN, A.R.S.M. RESEARCH in Chemistry and Physics in well-equipped laboratories. French, German, Spanish, Russian, Dutch, & Italian Classes. EVENING CLASSES also in Biology, Physiology, Practical Geometry, Building and Machine Construction, Steam, Theoretical and Applied Mechanics, Land and Quantity Surveying, and Estimating.

Calendar 6d. (post free 8d.), on application to the SECRETARY.

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, October 2nd.

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

Special Courses for London University Matric., Inter., and Final B A, B.Sc., Conjoint Board, Pharmaceutical and other examinations. Classes are also held in all Commercial Subjects, in Languages, Literature and Art All Classes are open to both sexes.

SATURDAY COURSES for Matric.. Inter., and Final B.A.. B.Sc DAY COMMERCIAL and HIGHER COMMERCIAL SCHOOLS. Prospectuses, and all other information, gratis on application.

DAVID SAVAGE, Secretary

ST. THOMAS'S HOSPITAL,
ALBERT EMBANKMENT, S.E.

(UNIVERSITY OF LONDON.)

The WINTER SESSION will COMMENCE on OCTOBER 2. The Hospital occupies one of the finest sites in London, and contains 603 Beds.

Entrance and other Scholarships and Prizes (26 in number), of the value of more than £500, are offered for competition each year.

Upwards of 60 Resident and other Appointments are open to Students after qualification.

A Students' Club forms part of the Medical School Buildings, and the Athletic Ground, nine acres in extent, situated at Chiswick, can be reached in forty minutes from the Hospital.

A Prospectus, containing full particulars, may be obtained from the Secretary, Mr. G. Q. Roberts.

J. H. FISHER, B.S. Lond., Dean.

PRELIMINARY SCIENTIFIC EXAMINATION,

UNIV. LOND.

South Kensington, S.W.

THE VICTORIA UNIVERSITY OF

MANCHESTER.

CHEMISTRY COURSE.

Full particulars of the Courses qualifying for the Degrees in Chemistry and for the Certificate in Applied Chemistry will be forwarded on applica.

FACULTY OF MUSIC.

FACULTY OF COMMERCE.

FACULTY OF THEOLOGY.

FACULTY OF MEDICINE.

DENTAL DEPARTMENT.

DEPARTMENT OF EDUCATION.

DEPARTMENT OF ENGINEERING.

PHARMACEUTICAL DEPARTMENT.

PUBLIC HEALTH DEPARTMENT.

For other Scholastic Advertisements, see pages claix, clxx,

Professor-G. H. LEONARD, M.A. (Camb.). English Literature and/Professor-R. P. CowL, M.A. (Trinity Coll., Language

Classics

1 Dublin).

Professor-FRANCIS BROOKS, MA (Oxon.).
Le turers in Chemistry, Mathematics, Physics, Engineering, Botany,
Physiology, Logic and Economics, History and Literature, Greek, Latin,
Hebrew, French, German, Italian, Oriental Languages, and Music.

Lady Tutor-Miss MARGARET J. TUKE, M.A.
Mistress of Method - Miss GERALDINE HODGSON, B A.

Full courses in preparation for the Engineering, Medical, Scientific and
Teaching Professions.
For full information see Prospectus, which will be forwarded free on
application.

JAMES RAFTER, Registrar and Secretary.

WESTMINSTER HOSPITAL MEDICAL SCHOOL,

CAXTON STREET, S.W.

A SCHOOL OF THE UNIVERSITY OF LONDON.

The WINTER SESSION will commence on MONDAY, OCTOBER 2, 1975. Scholarships of the aggregate value of £320 are offered to students entering in October. Examination on September 26 and 27. Fees 110 Gns. if paid in one sum on entrance. For University Students and those who have completed their anatomical and physiological studies 70 Gns. Special opportunities for Clinical work and for holding the various hospital appoint. ments. Dental students are specially provided for.

Prospectus and further particulars may be obtained from the DEAN.
Telegrams: "Clinic," London. Telephone: Victoria 765.

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

Full Courses for Matriculated Students in Arts, Laws. Science, Engineering, Medicine, and Theology at Composition Fees; or Students may attend the separate Classes.

Preparation for all Examinations of the London University.
MICHAELMAS TERM commences OCTOBER 3.

For Prospectuses and all information apply to the SECRETARY, King's College, Strand, W.C.

WOMEN'S DEPARTMENT, KENSINGTON.
MICHAELMAS TERM commences OCTOBER 9.
Apply to the VICE-PRINCIPAL, 13 Kensington Square.

For other Scholastic Advertisements, see pages clxviii, clxx,
and clxxi.

THE GLASGOW AND WEST OF SCOTLAND TECHNICAL COLLEGE, GLASGOW.

SESSION begins TUESDAY, SEPTEMBER 26, 1905, in the new buildings recently erected for the College.

The Diploma of the College is granted in the following Departments :CIVIL ENGINEERING, MECHANICAL ENGINEERING, ELEC. TRICAL ENGINEERING, MINING, NAVAL ARCHITECTURE, CHEMISTRY, METALLURGY, MATHEMATICS and PHYSICS. In conjunction with the Glasgow School of Art a Course for a Joint Diploma in Architecture has been arranged.

The Courses of Study for the Diploma usually extend over three Sessions. The Average Fee per Session is 12 125. Special Courses for individual Students are arranged as required. Holders of the Diploma are eligible for the Degree of B.Sc. in ENGINEERING of the UNIVERSITY OF GLASGOW after attendance for at least one Session upon prescribed University Classes. New and well-equipped Laboratories in the Departments of Physics, Chemistry, Technical Chemistry, Metallurgy, Mechanics, Mechanical and Electrical Engineering have been provided. The Preliminary Examination for Candidates for the Diploma begins on September 18. Names of intending candidates must be lodged not later than September 15, on forms which will be sent on application.

CALENDAR (price, by post, 15. 4d.) and PROSPECTUS (gratis) will be sent on application to the SECRETARY.

WIGAN

MINING & TECHNICAL COLLEGE.

Principal-THOMAS T. RANKIN, C.E., B.Sc., M. Inst. M. M., M.I.M.E.

SANDWICH SYSTEM OF MINING TRAINING.
DAY MINING COURSES.

Opening date, MONDAY, OCTOBER 2, at 9 a.m. Complete Diploma Course extends over a period of three or four years. Two Prizes of £10 10s. each awarded annually. Candidates for Colliery Managers' Certificates of Competency holding the above Diploma will be exempt from two out of the five years' practical experience required by the Coal Mines Regulation Act.

The Home Secretary has approved for the purposes of the Coal Mines Regulation Act (1887) Amendment Act, 1903, the Diplomas of this College. Prospectus post free on application to the PRINCIPAL, or

T. RATCLIFFE ELLIS, Hon. Sec.