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LANDER'S PATENT ANEMOMETER,

Records the force of every separate puff of wind, £4 10 0
RECORDING RAIN GAUGE, gives a continuous record
for a week, £4 10 0

BAROGRAPH (Aneroid or Mercurial), £4 10 0
RECORDING THERMOGRAPH, £2 17 6
Kew Certificates if desired.

Great numbers of these Instruments are now being supplied
to some of the Colonial Governments.
WRITE FOR METEOROLOGICAL LIST TO-

LANDER & SMITH, Scientific Instrument

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POLYMETER.

An accurate miniature Meteorological
Observatory for Scientific,

Industrial, and Hygienic purposes.
Invaluable for Forecasting the Weather.
See NATURE, April 24, 1902, page 592.
PRICE 25-

Pamphlet, fully describing its many applications, how
to use, and the results obtainable, post free.

A.GALLENKAMP & CO., Ltd.

19 & 21 SUN STREET,

FINSBURY SQUARE, LONDON, E.C.

Supplied with either Fahrenheit

MARCONI'S

LAMBRECHTS

or Centigrade Scale.

RADIUM ON HIRE.

(Activity 1,800,000 units.)

Fluorescent Screen, Electroscope, &c., and
Lantern Slides suitable for Lectures.

Radium Pendant Microscope with Radium, 2/6
Scintilloscope, full size, 7/6

Self-Luminous Radium Screen, 5/

Certificates of Radio-activity, 5/- each sample.
Electroscopes for the Lantern, 7/6

Post free within United Kingdom.

F. HARRISON GLEW, Patentee, 156 Clapham Road,

London, S.W.

CHEMICALS

WIRELESS TELEGRAPH CO. RARE METALS

MANUFACTURERS OF

Ltd..

High-Class Apparatus for Röntgen
Ray and High Frequency Work.
10", 12" & 14" INDUCTION COILS.
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Write for Illustrated Price List "H" to the Works :

TYSSEN ST., DALSTON, LONDON, N.E.

MINERALS

For Laboratory, Scientific, and all other
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COCOA NUT CHARCOAL SPECIALLY PREPARED.
CALCIUM METAL, 1/- oz.; 12/- lb.
Price List on Application.

HARRINGTON BROS.,

Chemical Manufacturers and Dealers,

4 OLIVER'S YARD, CITY ROAD, LONDON, E.C.

LIQUID AIR AND LIQUID HYDROGEN.

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.

For Prices and Particulars apply to the Sole Makers :BRIN'S OXYGEN COMPANY, LIMITED, ELVERTON STREET, WESTMINSTER, S. W.

MACMILLAN & CO.'S BOOKS

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ELECTRO-PHYSIOLOGY.

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By Prof.

Translated by F. A. WELBY.

CRYSTALLOGRAPHY. WATKINS & DONCASTER,

Our New Catalogue, XIX., with many illustrations, has just come out (post free on application).

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1. New Collection of 416 Crystal-models of wood, containing all the crystal forms and combinations represented by illustrations in the 4th ed. of the " Physikalische Kristallographie," by Prof. P. Groth (1905) at Munich £27 10 0 2. Large Collection of 916 Crystal-models of wood to illustrate the crystal forms of the minerals, by Prof. C. Hintze at Breslau. £90 0 0 3. New Collection of 8 Trigonal-Glass-models of Calcite, with the crystallographic axes according to Bravais (Weiss) and with the axes according to Miller, constructed by Prof. J. Beckenkamp at Würzburg £1 15 O 4. New Collection of 450 Crystal-models of pasteboard, systematically arranged according to the 32 classes of symmetry, by Prof. K. Viba at Prague £48 0 0 5. The Planes of Symmetry, 5 models constructed by Prof. K. Vrba at Prague £5 15 O 6. The Optical Wave Surfaces, 4 wire-models constructed by Prof. K. Vrba at Prague £6 8 0 7. The Optical Indicatrix, 3 wire-models by Prof. K. Vrba at Prague £2 5 0 8. The Sciodromes, 5 coloured plaster-models constructed by Prof. F. Becke at Vienna £5 0 0 9. Stands for Crystal-models, various constructions and in various

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* 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.

A NEW

EUDIOMETER

(WILSON'S PATENT).

This Eudiometer is peculiarly adapted for the demonstration of :

(a) The volume changes of K interacting gases.

(b) Boyle's Law (pressures above and below atmospheric).

(c) Charles' Law.

PRICE

£2 2 0 net.

Sole Manufacturers:

T&M

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34 CAMOMILE STREET, LONDON, E.C.

A NEW PRISM BINOCULAR

THE STEREOSCOPIC COMPANY'S NEW "PRISMA" BINOCULAR is undoubtedly the finest glass ever produced, and has approximately double the illumination of other glasses of equal magnification.

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OXYCATHODE TUBES

FOR THE PRODUCTION OF

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