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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.

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MACMILLAN & CO.'S NEW

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TWENTY-SIX GRADUATED EXERCISES IN GRAPHIC STATICS,

some in Two Colours, and with Skeleton Data to practise upon, and including the Application to Roofs, Moving Locomotives, Retaining Walls, Lévy's Steel Arches, Girders (Original Constructions), Masonry Arches, Lévy's Weight Tables, with an Essay on Graphical Statics, in the form of a Running Commentary on the Exercises, each of which has full Instructions printed on its face, the whole forming a Supplement to the Authors' Elementary Applied Mechanics.

By T. ALEXANDER, M.Inst.C.E.I., Professor of Engineering, Trinity College, Dublin; and
A. W. THOMSON, D.Sc., C.E., Professor of Engineering, College of Science, Poona.
FCAP. BROADSIDE. SEWED. 10s.

THE PRINCIPLES

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ECONOMICS.

A Fragment of a Treatise on the Industrial Mechanism of Society, and other Papers.

By the late W. STANLEY JEVONS, LL.D., M.A., F.R.S. With a Preface by HENRY HIGGS.
8vo. 10s. net.

A

MANUAL OF QUATERNIONS.

By CHARLES JASPER JOLY, M.A., D.Sc., F.R.S., Sec. R.I.A.; Fellow of Trinity College, Dublin; Andrews' Professor of Astronomy in the University of Dublin, and Royal Astronomer of Ireland. 8vo. 10s. net.

GUARDIAN.-"The thanks of all mathematicians will be heartily accorded to the author for bringing so important a weapon as quaternions within more moderate limits in so striking a treatise."

THE TRADE POLICY OF GREAT BRITAIN AND HER COLONIES SINCE 1860.
By CARL JOHANNES FUCHS, Professor of Political Economy in the University of Freiburg i. B. Translated by
CONSTANCE H. M. ARCHIBALD. With a Preface by the Right Hon. J. PARKER SMITH, M.A., M.P. Extra Crown 8vo,
7s. 6d. net.

PROBLEMS OF THE PANAMA CANAL, including Climatology of the Isthmus.
Physics and Hydraulics of the River Chagres, cut at the Continental Divide, and Discussion of Plans for the Waterway.
By Brig. Gen. HENRY L. ABBOT, U.S. Army, retired; Consulting Engineer, New Panama Canal Company. With Map.
Crown Svo, gilt top, 6s. 6d. net.
THE GEOGRAPHICAL SOCIETY OF BALTIMORE.

THE BAHAMA ISLANDS. Edited by GEORGE BURBANK SHATTUCK, Ph.D., Associate Professor of Physiographic Geology in the Johns Hopkins University. With Maps and Illustrations. Super royal 8vo. 42s. net.

MICROSCOPICAL PETROGRAPHY. WATKINS & DONCASTER,

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MARINE BIOLOGICAL ASSOCIATION
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THE LABORATORY, PLYMOUTH.
The following animals can always be supplied, either living
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For prices and more detailed lists apply to
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NOTICE.

THE DIRECTOR.

Proof Copies of the Photogravure Portrait of

PROF. SUESS

appearing in "Nature" of May 4 can be obtained from the Publishers at 5s. each.

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

Naturalists and Manufacturers of

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ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES. 15 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
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RECENT & COMING ECLIPSES.

BY

Sir NORMAN LOCKYER, K.C.B., F.R.S.

Second Edition, containing an account of the Observations made at Viziadrug, in India, in 1898, and of the conditions of the Eclipses visible in 1900, 1901 and 1905. 8vo. 6s. net.

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

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THE NEW GRISSON VALVE
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Printed by RICHARD CLAY AND SONS, LIMITED, at 7 & 8 Bread Street Hill, Queen Victoria Street, in the City of London, and published by MACMILLAN AND CO., LIMITED, at St. Martin's Street, London, W.C., and THE MACMILLAN COMPANY, 66 Fifth Avenue, New York.-THURSDAY, May 18 1905.

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be neatest, simplest, smallest and cheapest calculating machine ever designed. For adding up columns of figures rapidly and accurately. Can be used by anyone. "A necessity for all who have to add." Made entirely in steel and aluminium.

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See also page xxxiii in this issue.

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PHOTOGRAPHIC LENSES.

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