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A NEW PATTERN

All other air pumps superseded.

FORTIN'S STANDARD BAROMETER

THE

GERY K”

(Fleuss Patent)

Vacuum Pump.

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 24 : 5 : 0. LIST F.45. Pulsometer Engineering.com

Qine Elmoilronworks. Reading

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 lo 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 p'eces the 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 instrument is graduated in Fahrenbeit and Centigrade scales.

It is the BOLDEST Standard Barometer made. The PRICE IS LOWER than that of any other form of Standard Baroneter 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 tv 01 inch

and •1 millimetre. £3 7s.6d. 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.

REYNOLDS & BRANSON,L". JOHN J. GRIFFIN & SONS

,

LTD.,

Manufacturers of

SCIENTIFIC

APPARATUS.

THE RYSTOS STAND DEVELOPING TANK. For Developing plates or cut films slowly in a very

weak developer. Clean in use; gives excellent results with a minimum

of trouble. MADE OF STOUT

POLISHED COPPER.

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

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

Scientific Photographers. 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 Postage on any of above three sizes, 4d. extra.

COMPLETE EQUIPMENTS

FOR CHEMICAL, BACTERIOLOGICAL,

PHYSICAL, and METALLURGICAL LABORATORIES.

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NEW PHOTOGRAPHIC FRICE LIST, 25th EDITION, ON

APPLICATION.

Sardinia Street, London, W.C.

WAVE-LENGTH SPECTROSCOPE

(LARGE MODEL.)
Measures wave-lengths direct to an accuracy of 1 Angström unit (one ten-millionth
of a metre) 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. 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.

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FIRE OFFICE,
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Naturalists and Manufacturers of
CABINETS AND APPARATUS
FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

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SPECIAL SHOW-ROOM FOR CABINETS.
N.B.-For Excellence and Superiority of Cabinets and Apparatus, refer.
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A LARGE STOCK OF INSECTS, BIRDS' BUGS AND SKINS,
SPECIALITY.-Objects for Nature Study, Drawing

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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.

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LANTERN SLIDES of Scientific Subjects,

MICROSCOPIC SLIDES.
MARINE ORGANISMS, Hydrozoa, Crustacea, Annelida, &c., polyps
extended, without pressure, dark ground or opaque, very beautiful.' 'List.

Exhibition Groups of Diatoms, Petrological, &c.
Dispersal of Mr. HORNELL'S collection of Slides, Marine and
Botanical, from 3d. each.

MICROSCOPES, &c.
SECOND-HAND, large and ever-changing stock. Van Heurck, 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.

from 6/- per dozen.
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 Zoological,

&os. 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.
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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 purposes.

THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.

MICROSCOPICAL PETROGRAPHY.

Gentlemen interested in the above study are invited to send to

JAMES R. OREGORY & CO., 1 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

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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-
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For prices and more detailed lists apply to
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THE DIRECTOR.

LANTERN SLIDES.-Orchids, Cacti,

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PHOTOMICROGRAPHY for Publishers,
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Good work, moderate charges.--SAXBY, 91 Peany Lane, Sefton Park, Liverpool.

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NOTICE.-Advertisements and business letters for Nature should be addressed to the Publishers; Editorial
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THE GAIFFE AUTO-MOTOR

MERCURY JET INTERRUPTER

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(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. ng

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.

IN

GAS CONSUMED. Represents K and L types, giving 3.5 H.P.

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

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

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...

6

1

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

Bugula plumosa (Bird's Head coralline). Specially fine mounts 2 6 set of 12 .£1 0 0 Karyokinesis in root of Water Lily

3- & 41Send for Special Descriptive List.

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

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

Ź
7
(Aspersa). In case

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

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

1 8
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7 6 SEND FOR THE ABOVE NEWLY PUBLISHED CATALOGUE OF MICRO. OBJECTS. WATSON'S CATALOGUE OF MICROSCOPES (158 pages) is of special interest to all Microscopists,

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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

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Enable you to take Photographs of Distant or Inaccessible

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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 MAILLON

AND Co., LIMITED, at St. Martin's Street, London, W.C., and The MACMILLAN COMPANY, 66 Fifth Avenue, New York. – THURSDAY, August 31, 1935

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