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NEW SCIENCE SERIES.

Messrs. J. M. Dent & Co. have pleasure in announcing a new series of books, interesting to every reader of "Nature." The series deals with the Lives and Works of famous English scientists, and is entitled

ENGLISH MEN OF SCIENCE

Edited by Dr. J. REYNOLDS GREEN. Cloth, 2s. 6d. net per volume. With Photogravure Frontispiece.

FIRST VOLUME. NOW READY.

HERBERT SPENCER

By J. ARTHUR THOMSON, M.A.

A short account (284 pages) of his life, an appreciation of his characteristics and a statement of some of the services he rendered to science.

"After the great Autobiography there is no book in the language which gives a better conception of the philosopher and his work, or gives it more pleasantly."-Birmingham Post.

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AND

IMPORTANT NEW BOOKS From ARCHIBALD CONSTABLE'S List. PHYSIOLOGY OF THE NERVOUS SYSTEM. By J. P. MORAT. Translated and Edited by H. W. SYERS, M.A., M.D. Cantab., Physician to the Great Northern Central Hospital With 263 Illustrations, Plain and in Colours. Demy 8vo. 31s. 6d. net LECTURES ON TROPICAL DISEASES. By Sir PATRICK MANSON, K.C.M.G., M.D., LL.D. (Aber.), F.R.C. P. With many Illustrations. Demy 8vo. 75. 6d. net.

Journal of Tropical Medicine.-"Every medical man interested in tropical medicine will welcome this volume. ... The book will remain a classic long after many of the subjects it deals with are further elucidated." ON LEPROSY AND FISH-EATING.

By JONATHAN HUTCHINSON, F. R.S., LL.D., F.R.C.S. This work comprises statements as to the History of Leprosy, its nature, its prevalence in different countries, and the conditions under which it has disappeared from many. Fully Illustrated. Demy 8vo 12s. 6d. net. THE EUAHLAYI TRIBE: A Study of Aboriginal Life in Australia. By Mrs. LANGLOH PARKER. With an Introduction by ANDREW LANG. With Illustrations. Demy 8vo. 7s. 6d. net. Nature says:-"Both for the anthropologist who wants well-sifted and trustworthy material and for the ordinary reader who would like to know something about the life of the native Australian, this is a most useful book. There is no other work on the Australians which gives anything like so good a general view; it is clear of superfluous technicalities, eminently readable, and written with so much sympathy that we cease to be surprised at the success of the writer."

Folk Lore says:-"Every anthropologist who studies the work will be grateful for the valuable information she has put together." TUNNEL SHIELDS AND THE USE OF COMPRESSED AIR IN SUBAQUEOUS WORKS. By WILLIAM CHARLES COPPERTHWAITE, M.Inst.C.E., Bridges Engineer of the London County Council, sometime Resident Engineer of the Central London Railway and of the Greenwich Footway Tunnel. With 260 Illustrations and Diagrams. Crown 4to. Price 31s. 6d. net. MODERN TUNNEL PRACTICE, Illustrated by Examples Taken from Actual Recent Work in Europe and America. By D. MCN. STAUFFER, M. Inst. C. E. Demy 8vo. Price 215. net. A NEW AND VERY IMPORTANT SERIES: TECHNICAL DICTIONARIES in Six Languages.

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NOW READY.

Vol. I.-THE ELEMENTS OF MACHINERY and the Most Frequent Tools used in working Metal and Wood.

Price 5s. net, Cloth; 7s. 6d. net, Leather, per volume.

THE SEVEN FOLLIES OF SCIENCE: A Popular Account of The Most Famous Scientific Impossibilities, and the Attempts which have been made to Solve Them, to which is added a Small Budget of Interesting Paradoxes, Illusions and Marvels. By JOHN PHIN, Author of "How to Use the Microscope," &c. With numerous Illustrations. Demy 8vo. MECHANICAL APPLIANCES,

55. net.

An

MECHANICAL MOVEMENTS AND NOVELTIES OF CONSTRUCTION. Encyclopedia of Mechanical Movements and Mechanical Appliances, including many Novelties of Construction used in the practical operation of the Arts, Manufactures, and in Engineering. For Engineers, Draughtsmen, Inventors, Patent Attorneys and all others interested in Mechanical Operations. By GARDNER D. HISCox, M.E., Author of Gas, Gasolene, and Oil Engines," &c. 400 pages. About 1000 Illus.

LABORATORY OTHER WORK,

of the highest degree of efficiency at moderate prices.

ILLUSTRATED PRICE LIST "N" POST

FREE ON APPLICATION.

WORKS:

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

ALSO AT

BRUSSELS, PARIS, ROME.

trations. 12s. 6d. net.

MECHANICAL MOVEMENTS, POWERS, DE-
VICES, AND APPLIANCES. By GARDNER D HISCOX, M.E.
Tenth Edition. Demy Evo. Over 4co pages. 1,649 Illustrations and
Descriptive Text.

12s. 6d. net.

ARCHIBALD CONSTABLE & Co., Ltd., 16 James St., Haymarket,

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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, Alcy-
onium; 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.

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THE DIRECTOR.

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NOW READY.

A HANDBOOK OF BRITISH INLAND

BIRDS.

By ANTHONY COLLETT. With Coloured and Outline Plates of Eggs by ERIC PARKER. Crown 8vo. 65.

THE

SCHOOL

WORLD.

A MONTHLY MAGAZINE OF EDUCATIONAL WORK AND PROGRESS.

SIXPENCE MONTHLY. YEARLY VOLUME 75. 6d. NET.
PRINCIPAL CONTENTS FOR MAY.

The Education Bill, 1906.-The Principles of Promotion. By J. L. Paton, M. A.-Is School Science Worth Having? By Prof. H. E. Armstrong, Ph.D., LL.D., F.R.S.-The Phonograph in the Class-room. (Illustrated.) By W. H. D. Rouse, Litt.D.-Accidents in Chemical Laboratories. By R. L. Taylor, F.I.C.-George Buchanan as an Educationist. By William Murison, M. A.-Sports without Prizes. By Arthur Pickles, A.R.C.Sc.-Cambridge Local Examinations, 1905. Hints for Teachers from the Examiners' Reports.-The Inspection of Secondary Schools. By the Rev. Arthur J. Cooper, LL. D., M. A., B.Sc.-New Science Rooms at Cheltenham Grammar School. (Illustrated.).A Contribution to the Geography of the Spanish Armada. (Illustrated.).-Correspondence: Equipment for Shooting in Schools. By H. W. Cousins, M.Sc.-Solubility Curves-a School Laboratory Experiment. By Hugh Richardson, M.A.National League of Workers with Boys. By Chas. E. B. Russell and J. H. Whitehouse. -Sir Edwin Cornwall on the Role of the City. By A Lover of Historical Truth.-Production of Artificial Speech Sounds. By W. H. D. Rouse, Litt. D.

CRYSTALLOGRAPHY. WATKINS & DONCASTER,

Our New Catalogue, XIX., with many illustrations, has just come out (post free on application). The following are included:

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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 £27 10 0 (1905) at Munich 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, sys tematically 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 0 6. The Optical Wave Surfaces, 4 wire-models constructed by Prof. K. Vrba at Prague... £6 8 0 The Optical Indicatrix, 3 wire-models by Prof. K. Vrba at Prague £2 5 0

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The Sciodromes, 5 coloured plaster-models constructed by Prof. F.
Becke at Vienna
£5 0 0
Stands for Crystal models, various constructions and in various

sets.

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Dr. F. KRANTZ,

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

Collections and Single Specimens of

MINERALS, NATURAL CRYSTALS,

PRECIOUS STONES, ROCKS & FOSSILS. Cabinets, Geologists' Hammers, Card Trays, Glass Capped Boxes, Wood and Glass Models of Crystals and Precious Stones, Sections of Rocks, and other Apparatus.

NEW CATALOGUES POST FREE.

THOMAS D. RUSSELL, 78 Newgate Street, LONDON, E.C.

NOTICE OF REMOVAL. JAMES R. GREGORY & Co.,

MINERALOGISTS, &c.,

of KELSO PLace, kensington,

beg to announce that they have removed to more convenient and commodious Premises at

139 FULHAM ROAD, SOUTH KENSINGTON, S.W.

CALCIUM METAL

98.6

We now supply as wire in 2 gauges, and 2 millimeters.

ARMBRECHT, nelson & CO.,

71 & 73 Duke Street, Grosvenor Square, London, W.

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.)

☛ CATALOGUE (102 pp.) POST FREE.

MASON'S MICRO. MOUNTS.

SPECIAL SLIDES. USEFUL AND INTERESTING. Llanynynech Limestone, beautiful fossils (a unique specimen), 1/4. Oldham Coal, showing spores, &c., 1/4. Volcanic Dust, Mt. Soufrière (1902), 1/1. Leaf Sections, 1. and L. Pineapple, 1/1. L. and T. Young Date Fruit, D.S., 1/4. Section Leaf of Coltsfoot, showing attachment of Micro. Fungi, 1/1, Bud Lilium, all parts in situ, 1/7. All Post Free.

R. G. MASON, 69 Clapham Park Rd., London, S.W.

CLARKE & PAGE, Specialists in Microscopy,

104 LEADENHALL STREET, LONDON. SECOND-HAND MICROSCOPES. Van Heurck (Watson), Monocular and Binocular bodies, &c, £20, Edinburgh F.. Crouch Student, 2 oculars, 2 objectives, £4 10s. Baker D.P.H., £6 6s. Johnson Student, £3. Also others NEW LOW and MEDIUM POWER OBJECTIVES. Large aperture, flat field, semi-apochromatic, corrected for Photography. For MICRO-SLIDES (actual preparers) and all accessories, see New Catalogue gratis. Enquiries invited. See "NATURE," Jan. 4, '06, page 231.

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Physical Apparatus.

BECKER, Hatton Wall, LONDON.

be addressed to the Publishers; Editorial PHUSIS, LONDON.

CHARGES FOR ADVERTISEMENTS.

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One Sixteenth Page, or Eighth Col. 10
One Eighth Page, or Quarter
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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

THE NEW MERCURY VAPOUR LAMP FOR X-RAY WORK

FOR THE PRODUCTION OF

ULTRA-VIOLET RAYS

Made of UVIOL GLASS for Physical and Medical Purposes.

CURRENT CONSUMPTION ONLY 2 to 3 AMPERES per 300 C.P. See Article in NATURE, Sept. 21, 1905, page 513.

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A

B

THESE Simple Extractors are much more

effective than Soxhlets for many purposes, as the substance is kept covered by the solvent in use and a flow of clean solvent is continu. ously moving directly through the substance, whereby the extraction is greatly facilitated. Price-A, 7/- doz.; B, 8/- doz. C, Complete apparatus, with Condenser (Burgess's Patent), all stoppered together, 7/6. Sole Makers

C. E. MÜLLER, ORME & CO., Ltd.,

Scientific Glass Blowers and
Manufacturers of Chemical and
Physical Apparatus,

148 HIGH HOLBORN, LONDON, W.C. CONTRACTORS TO H M. GOVERNMENT.

C

PRISMS CAN BE CLEANED BY THE USER.

Write for Catalogue No. 12B, Free from

THE

LONDON STEREOSCOPIC COMPANY,

106 & 108 RECENT ST., W., or 54 CHEAPSIDE, LONDON, E.C.

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 3, 1906.

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PRACTICAL NOTES ON
TELEPHOTOGRAPHY.
Free on application to

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CHEMICAL AND PHYSICAL BENCH, illustrated above, as supplie
to National Physical Laboratory, Teddington, fitted for Gas, Water
and Electricity.

Catalogue of Chemical and Physical Apparatus, 350 pp. and 1200
Illustrations, free on application.
DESIGNS OF BENCHES AND FITTINGS TO SUIT ALL REQUIREMENTS.
14 COMMERCIAL STREET, LEEDS.

NEGRETTI & ZAMBRA,

SOLE MAKERS OF

JORDAN'S (PATENT) SUNSHINE RECORDER.

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Simplified Model, adjustable for any latitude, thoroughly

efficient.

Price £17s. 6d.

Sensitised Charts,
5s. per 100.

Illustrated Price List
of various types of
Sunshine Recorders
and other Meteorolog-
ica! Instruments, free
by post to all parts of
the World.

R. & J. BECK, Ltd., 68 CORNHILL, LONDON.

38 HOLBORN VIADUCT, LONDON.

BRANCHES: 45 CORNHILL AND 122 RECENT STREET.

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