Page images
PDF
EPUB

NEW PATTERN

FORTIN'S STANDARD BAROMETER

[merged small][merged small][ocr errors][merged small]

Registered Design No. 470,297. As will be seen by the illustration, this Barometer is built on original lines.

By the absence of the ordinary tubular enclosures in the usual form of instrument) the mercurial column is FULLY EXPOSED to view, NO SHADOWS are thrown upon the column, and therefore an extremely accurate and instantaneous reading is made possible. The scales being graduated upon the flat side peces he DIVISIONS AND FIGURES ARE ALWAYS IN VIEW, and the vernier is very much more legible than in the ordinary tubular patterns.

The bore of the tube is 0.5 inch.

The scales are graduated in inches and millimetres, and, by means of the verniers, are capable of being sub-divided to read 10 0·002 inches and 0:1 m/m.

The attached Thermometer on the body of the instru. ment is graduated in Fahrenheit and Centigrade scales.

It is the BOLDEST Standard Barometer made.

The PRICE IS LOWER than that of any other form of Standard Baroineter of the same dimensions.

It yields readings equally close as the bighest priced instruments.

Price complete, mounted on handsome Polished Solid Mahogany Board, with Brackets for Suspension, and Opal Glass Reflectors,

£7 10s. Od. SMALLER SIZE, “THE STUDENTS," designed for Schools for demonstration work, and small private Ob-ervatories; bore 25 ; reading tu 01 inch

and 1 millimetre. 23 7s. 6d.

Results hitherto only pos. sible with mercury pumps are readily obtainable by the Geryk." Used by all leading scientists. Far more rapid than any other

vacuum pump. Price from Write for $4 : 5 : 0. LIST F.45. Pulsometer Engineering Como

Vine Elmoilronworks. Reading

Sole Manufacturers and Proprietors of the Regd. Design:
PASTORELLI & RAPKIN, Ltd.,

46 HATTON GARDEN, LONDON, E.C. WHOLESALE MAKERS OF ALL KINDS OF METEOROLOCICAL INSTRUMENTS

Telegrams: RAPKIN, LONDON.

Nat. TEL.: 1981 Holborn. Estd. 150 years. N.B.- If any difficulty be found in securing any of our Instru.

ments through your Dealer, kindly communicate with us.

[merged small][ocr errors][merged small][merged small]
[graphic]
[ocr errors]
[graphic]

RECISTERED

TRADE MARK.

FOR

Tank to take 6 plates 15" X 12", and with Adapters to suit

any smaller plate; complete, £1 : 10:0 This arrangement is specially recommended to Radiographers and other

Scientific Photograhers. Tank to hold 1 doz. $ plates only

... ... 4/6 each. Tank to hold 1 doz. 5" x 4" plates only ... ... 5/Tank to hold 1 doz. } plates only ... ... ... 6- ,,

Pustage on any of above three sizes, 4d. extra.

COMPLETE EQUIPMENTS CHEMICAL, BACTERIOLOGICAL,

PHYSICAL, and METALLURGICAL LABORATORIES. Sardinia Street, London, W.C.

NEW PHOTOGRAPHIC PRICE LIST, 25!h EDITION, ON

APPLICATION.

WAVE-LENGTH SPECTROSCOPE

(LARGE MODEL,)
Measures wave-lengths direct to an accuracy of 1 Angstrom unit (one ten-millionth
of a netre) from W.L. 3888 to W.L. 7724.

SPECIAL ADVANTAGES.
The Collimator and Telescope are
rigidly fixed at right angles, thus the
instrument will stand in a corner, is always
ready for use and in adjustment.

The wave-lengths can be read off by the observer without moving from his place.

The object glasses and prism are large (1}" clear aperture), which enables the saintest visible lines to be seen.

The eyepiece has a bright pointer for measuring the W.L. of bright lines on a dark field.

Means are supplied of very simply setting the Zero, although on account of the great rigidity and careful construction throughout it may be used for many months without any setting being needed.

[graphic]

ADAM HILGER, Ltd., 75a Camden Road, London, N.W.

AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.

Telegraphic Address :-“ Sphericity, London." ILLUSTRATED LIST (“A”) OF SPECTROSCOPES AND SPECTROSCOPIC ACCESSORIES

GRATIS ON APPLICATION.

[merged small][merged small][merged small][merged small][merged small][graphic][graphic][subsumed][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small]

MACMILLAN & CO.'S SCIENCE CLASS BOOKS.

ADAPTED TO THE SOUTH KENSINGTON SYLLABUSES. 1.-PRACTICAL PLANE AND SOLID GEOMETRY.

X. & XI.-CHEMISTRY-continued. Practical Plane and Solid Geometry for Elementary Students. Chemical Problems. By Prof. T. E. THORPE, C.B., F.R.S. By J. HARRISON, M.I.M.E. 25. 6d.

With Key. 25.
Practical Plane and Solid Geometry for Advanced Students. Chemical Arithmetic. By S. LUPTON, M.A. With 1200

By J. HARRISON, M. Inst. M.E., &c., and G. A. Problems. 45. 6.1.
BAXANDALL. 45. 6d.

Introductory Chemistry for Intermediate Schools. By L. M.
II.-MACHINE CONSTRUCTION AND DRAWING. JONES, B.Sc. 25.
Machine Construction and Drawing. By F. CASTLE,

Chemistry for Organised Schools of Science. By S. PARRIŞII, M.I.M.E.

B.Sc., A.R.C.S. (Lond.), with Introduction by D III.-BUILDING CONSTRUCTION.

FORSYTH, M.A., D.Sc. 25. 6d. Building Construction for Beginners. By J. W. RILEY,

Practical Inorganic Chemistry. By G. S. TURPIN, M.A., Rochdale Technical School. 2s.6d.

D.Sc. 25. 6d. Building Construction for Advanced Students. By J. W.

Practical Inorganic Chemistry for Advanced Students. By RILEY.

CHAPMAN JONES, F.I.C., F.C.S. 25. 60.
[In Preparation.
V.-MATHEMATICS.

The Junior Course of Practical Chemistry. By F. JONES, An Elemontary Course of Mathematics. Comprising Arith

F.C.S. 25. 6d. metic, Algebra, and Euclid. By H. S. HALL, M.A., and

Tables for Qualitative Chemical Analysis arranged for the F. H. STEVENS, M.A. 25. 6...

use of Students. By A. LIVERSIDGE, M.A., LLD., An Elementary Course of Mathematics. Comprising Arith

F.R.S. 45. 6d. net. matic, Algebra, and Ge melry. By H. S. HALL, M.A., and

Lessons in Organic Chemistry. By G. S. TURPIN, M.A, F. H STEVENS, M.A. 25. 6d.

D.Sc. 25. 6d. Graduated Test Papers in Elementary Mathematics. By

Theoretical Organic Chemistry. By J. B. COHEN, Ph.D. 6s. Rev. WALTER J. WOOD, M. A. Is.

Organic Chemistry. By Prof. IRÁ REMSEN. 65. 6d. Mathematical Tables for Ready Reference. Compiled by

Practical Organic Chomistry for Advanced Students. By FRANK CASTLE, M.I.M.E. Sewed. 20.

TULIUS B. COHEN, Ph.D. 35. 60. Practical Mathematics for Beginners. By F. CASTLE.

XII.-GEOLOGY. 25. 6d. Key, 5s. net.

Geology for Beginners. By W. W. WATTS, M.A., F.G.S. Elementary Practical Mathematics for Technical Students.

25. 6d. By F. ČASTLE, M.I.M.E. 35. 6d.

XIV.-HUMAN PHYSIOLOGY.
A Manual of Practical Mathematics. By F. CASTLE, Physiology for Beginners. By Sir MICHAEL FOSTER,
M.I.M.E. 65.

K.C.B., and Dr. L. E. SHORE. 25. 6d.
VI. -THEORETICAL MECHANICS.

Lessons in Elementary Physiology. By the Right Hon.
Elementary Mechanics of Solids. By W. T. A. EMTAGE, T. H. HUXLEY, F.R.S. 45. 6d. Questions. Is. 6d.
M.A. 25. 6d.

XV.-GENERAL BIOLOGY. Mechanics for Beginners. By W. GALLATLY, B.A. 25. 6d. An Introduction to Nature-Study. By ERNEST STEN Mechanics for Beginners. By Rev. J. B. LOCK, M.A. HOUSE, B.Sc. Illustrated. 35. 6d. Part I. Mechanics and Solids. 25. 6d.

XVI.-ZOOLOGY. Hydrostatics for Beginners. By F. W. SANDERSON, | A Manual of Zoology. By T. JEFFERY PARKER, D.Sc., M.A. 25. 6d.

F.R.S., and W. A. HASWELL, M.A., D.Sc. 10s. 6d.
VII.--APPLIED MECHANICS.

XVII.-BOTANY.
Applied Mechanics for Beginners. By J. DUNCAN,
Wh.Sc. 25. 6d.

Botany for Beginners. By ERNEST EVANS. Second

Edition. 25. 6d.
Lessons in Applied Mechanics. By Prof. J. H. COTTERILL,
F.R.S., and J. U. SLADE. 55. 6d.

XIX.-METALLURGY.
VIII.-SOUND, LIGHT, AND HEAT, AND

A Text-Book of Elementary Metallurgy. By A. H. HIORNS, ELEMENTARY PHYSICS.

35. Questions. 15. Elementary Lessons in Heat, Ligh:, and sound. By D. E.

XXII.-STEAM. JONES, B.Sc. 25. 6d.

The Steam Engine and Gas and Oil Engines. By JOHN Lessons in Heat and Light. By D. E. JONES, B.Sc. 35. 6d.

PERRY, F.R.S. 3rd Impression. 75. 6d. net. Light for Students By EDWIN EDSER. 6s.

XXIII.-PHYSIOGRAPHY. Practical Exercises in Light. By R. S. CLAY, D.Sc. 25. 5d. Physiography for Beginners. By A. T. SIMMONS, B.Sc. Heat for Advanced Students. By E. EDSER, A.R.C.Sc. 45. 6d. 25. 6d. Practical Exercises in Heat. By E. S. A. ROBSON, M.Sc. Experimental Science (Section 1. Physiography). By Prof. 25. 6d.

Ř. A. GREGORY and A. T. SIMMONS, B.Sc. 25. 68 Elementary Physics. By BALFOUR STEWART, F.R.S. Physiography for Advanced Students. By A. T. SIMMONS, New Edition, thoroughly Revised. 45. 6.1. Questions, 25. B.Sc. 45. 6d. IX.-MAGNETISM AND ELECTRICITY.

Elementary Lessons in Astronomy. By Sir NORMAN Magnetism and Electricity for Beginners. By H. E.

LOCKYER, K.C.B. 5s. 6d. HADLEY, B.Sc. (Lond.). 25. 6d.

XXIV.-AGRICULTURAL SCIENCE AND RURAL Magnetism and Electricity for Students. By H. E.

ECONOMY TADLEY, B.Sc.

Elementary Lessons in the Science of Agricultural Practice. Practical Exercises in Magnetism and Electricity. By H. E. By H. TANNER, F.C.S. 35. 6d. HADLEY, B.Sc. 25. 6d.

XXV.-HYGIENE. Electricity and Magnetism for Beginnors. By F. W. SAN. | Hygiene for Beginners. By E. S. REYNOLDS, M.D. 25.64 DERSON, M.A. 25. 6d.

Science of Common Life (Being a New Edition of “Experi Elementary Lessons in Electricity and Magnetism. By mental Hygiene"). By A. T. SIMMONS, B.Sc., and Prof. SILVANUS P. THOMPSON, F.R.S. 45. 6d.

E. STENHOUSE, B.Sc. 25. 6d.
X. & XI.-CHEMISTRY

Hygiene for Students. By E. F. WILLOUGHBY, M.B. Chemistry for Beginners. By Sir HENRY ROSCOE,

45. 6d. F.R.S., assisted by J. LUNT, B.Sc. 25. 6d.

XXVI.-ELEMENTARY SCIENCE OF COMMON LIFE. The Elements of Chemistry. By Prof. IRA REMSEN. 25. 6d. Science of Common Life (Being a New Edition of "* Expen. Inorganic Chemistry for Advanced Students. By Sir H. E. mental Hygiene"). By A. T. SIMMONS, B.Sc., and ROSCOE, F.R.S., and Dr. A. HARDEN. 45. 6d.

E. STENHOUSE, B.Sc. 25. 6d.

WATKINS & DONCASTER,
CABINETS AND APPARATUS

PHENIX
ASSURANCE COMPANY, LIMITED.

Naturalists and Manufacturers of
FIRE OFFICE,
19 LOMBARD ST., E.C., and 57 CHARING CROSS, S.W.

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
ESTABLISHED 1782.

BRANCHES OF NATURAL HISTORY.
Moderato Ratos. Absolute Security. Bloctric
Lighting Rules Supplied. Liberal Loss Sottlomonte.

SPECIAL SHOW-ROOM FOR CABINETS.

N.B. -For Excellence and Superiority of Cabinets and Apparatus, refer. Prompt Payment of Olaims.

ences are permitted to distinguished patrons, Museums, Colleges, &c. LOS8BS PAID OVBR £28,000,000.

A LARGE STOCK OF INSECTS, BIRDS' BUOS AND SKINS,
SPECIALITY.-Objects for Nature Study, Drawing

Classes, &c.

Birds, Mammals, &c., Preserved and Mounted by First-class ESTABLISHED 1851.

Workmen true to Nature.

All Books and Publications on Natural History supplied. Current Accounts. 2% Interest allowed on minimum monthly balances when not drawn below £100.

36 STRAND, LONDON, W.C. Deposits. 21% Interest allowed on Deposit Accounts. Advances made. Stocks and Shares bought and sold.

(Five Doors from Charing Cross.)

Dr New Catalogue (102 pp.) just issued, post free. Apply C. F. RAVENSCROFT, Secretary,

Southampton Buildings, High Holborn, W.C.

BIRKBECK BANK

LANTERN SLIDES

for Scientificers aberts,

ical,

c.

MICROSCOPIC SLIDES.
MARINE ORGANISMS, Hydrozoa, Crustacea, Annelida, &c., polyps
extended, without pressure, dark ground or opaque, very beautiful. List.
Exhibition Groups of Diatoms, Petrological

Dispersal of Mr. HORNELL'S collection of Slides, Marine and
Botanical, from 3d. each.

MICROSCOPES, &o.
SECOND-HAND, large and ever-changing stock. Van Heurek, new,
others including Objectives, Condensers, Polariscopes, &c., by Watson,
Ross, Powell and Lealand, Beck, Pillischer Reichert, Leitz, &c. Prismatic
Binoculars, Lantern Slides, Mounting Materials. Lists.
Mr. HERBERT CLARKE, 104 LEADENHALL STREET, LONDON.

Tel. :-1316 CENTRAL.

Also Hand Painted from 1/3 to 5/- each.
Slides from Prints, Drawings, Photographs, &c., a Speciality.

PHOTOMICROGRAPHS.
Storage Cabinets for Lantern Slides to hold 400, 10/6;

. 600, 14/6 ; 1200, 25/6. See List. MICROSCOPICAL SLIDES, Botanical.c. Zoological,

LO, &c., from bs. per dozen.
FLATTERS & GARNETT, Ltd.,

48, DEANSGATE,
And at CHURCH ROAD, LONGSIGHT, MANCHESTER.

LIVING SPECIMENS FOR

THE MICROSCOPE.

ROCKS, MINERALS, FOSSILS.
For Collectors, Students, Technical schools, Colleges, &o.

COLLECTIONS IN POLISHED DEAL BOXES.
as Specimens, 576; 50 do., 10/6; 100 do., 211-; 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 sont on approval.
Cabinets, Geologists' Hammers, Chisels, Card Trays, Qlass-capped

Boxes, Models of Crystals, &c., &c.

NEW CATALOGUE POST FREE. THOMAS D. RUSSELL, 78 Newgate St., London, E.C

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, Ampbioxus, Rana, Anodon, &c., for Dissection

THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.

MICROSCOPICAL PETROGRAPHY."

Gentlemen interested in the above study are invited to send to

JAMES R. OREGORY & CO., i Kelso Place, Kensington Court, London, W.,

for a Prospectus of
THE TWENTIETH CENTURY ATLAS OF

MICROSCOPICAL PETROGRAPHY,
Dow being issued in Twelve Monthly Parts, each Part containing Four Fine

Half-Tone Plates, and also Four actual Rock Sections. Subseription in advance, elther Monthly, 71-; Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, 44 4s.

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 ; Activia, Tealia, Caryophyllia, Alcy-
onium ; Hormiphora (preserved); Leptoplana; Lineu«, `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.

LANTERN SLIDES.-Orchids, Cacti,

Palms, Insectivorous Plants, &c. - For lists apply L. FARMAR, 6 Mortlake Terrace, Kew.

TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN.
TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher
Local, thorough acquaintance with Modern Languages). Research,
Revision, Translation. Scale of charges on application. The Cam.
bridge Type-writing Agency, 10 Duke Street, Adelphi, W.C.

PHOTOMICROGRAPHY for Publishers.

Lecturers, Manufacturers, and general scientific research. Good work, moderate charges.--SAXBY, 91 Peany Lane, Sefton Park, Liverpool.

[ocr errors]

NOTICE.-Advertisements and business letters for Nature should be addressed to the Publishers; Editorial
Communications to the Editor. The telegraphic address of NATURE is “ Puusis," LONDON.
SUBSCRIPTIONS TO "NATURE."

CHARGES FOR ADVERTISEMENTS.
E s. d. TO ALL PLACES ABROAD:- £ s. d.

& s. d.

*Three Lines in Column Yearly . . . . 180 Yearly . . . . 1 10 61

. 0 a 6 Quarter Page, or Half | Per Line after

Oo9a Column . . . 1 15 0 Hall-yearly . . . 014 6 Half-yearly .

. 015 6 One Sixteenth Page.or Eighth Col. 10

Col. 10

o 1
Half a Page, or a Column 3 SO

, Quarterly . .Oo 61 Quarterly . . .o 8 o One Eighth Page, or Quarter

Column

. 018 6 Whole Page . . . 66o The first line being in heavy type is charged for as Two Lines. Cheques and Money Orders payable to MACMILLAN & CO., Limited.

OFFICE: ST. MARTIN'S STREET, LONDON, W.C.

THE GAIFFE AUTO-MOTOR

MERCURY JET INTERRUPTER

[graphic]

TOP

[ocr errors]

(Patented in Britain). NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR.

The interruption cuts the current both for motor and coil. In other words, motor and interrupter are electrically and mechanically linked together.

1 See Nature, July 20, 1905. Fage 277. Price, including box and packing, £4 :6:6 THE MEDICAL SUPPLY

ASSOCIATION, 228 Gray's Inn Road, London, w.c.

Descriptire Circular upon application. CROSSLEY'S GAS ENGINES RECENTLY

GREAT REDUCTION REMODELLED. Represents K and L

GAS CONSUMED. types, giving 3.5 H.P.

Up to the end of 1904, and 5 H.P

over 51,000 gas and

CROSSLEY BR respectively.

oil engines had been

delivered, represent. Immediate Delivery

ing about threefor Stock Sizes

quarters of a million of Engines.

actual horse-power. CROSSLEY BROS., LTD., OPENSHAW, MANCHESTER NEW MICROSCOPIC SLIDES

From the New Issue of W. WATSON & SONS' No. 3 CATALOGUE, just published. Post Free on application.

[graphic]

IN

Bugula plumosa (Bird's Head coralline). Specially fine muunt

c

Tsetse Flies (G. palpalis), whole insect ...

7 6

Perfume Glands on Leaf of Lavender ...
Dissections of all parts may be had mounted separately. Also in

...210
Karyokinesis in root of Water Lily ...

3- &4. "Send for Special Descriptive List.***

Leg of Flea, showing muscular structure Blood-sucking Maggot (from the Con

7 6 Set of 16 Slides illustrating the development of an Ascidian Fly hatched from above, Auchmeromyia luteola ...

(Aspersa). In case ...

25 0 Section of Brazilian Quartz, showing cavities containing Auid.

Trypanosoma Brucei (Tsetse Fly disease) Very interesting

Set of 5 Slides of the Garden Spider, showing different stages of Eggs of Emperor Moth, fertile and sterile, on 1 slide .

growth. In Case ... SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists,

post free. · W. WATSON & SONS, 313 High Holborn, London, 'w.c.

Branches-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM.

DALLMEYER'S TELE-PHOTO. LENSES & ATTACHMENTS

Enable you to take Photographs of Distant or Inaccessible

Subjects of sufficient size to be of practical value.
Ir Indispensable for use in all departments of Natural

History Field Work (especially Ornithology), and also
to Architects.

Price from £3 15s.
BALI MEYERS PATENT

Prices and Particulars on application. Estimates sa
STIGMATIC LENS

advice free.

J. H. DALLMEYER, Ltd., Stigmatie Lens fitted with Tele-Photo. Attachment. 25 Newman Street, London, W..

MAKERS OF (These Attachments can be fitted to any good Lens.) THE CELEBRATED DALLMEYER LENSES. Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACION

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, August 31, roos

[graphic]
« PreviousContinue »