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THE SYTAM SYSTEM
Saves an incredible amount of wall space and MICROSCOPE. | completely utilises dark corners, recesses, and Horizontal and Vertical Scales ;
out-of-the-way places. 16 cm. in length. The microscope
Prevents crowding and confusion. rotates on a horizontal axis, and
Allows for extension as and when required.
One power and one Eye-piece. | seldom or never necessary.
... '05, 70 by producing perfect order in the Laboratory,
SOME SYTAM FITTINGS. | BELMONT STREET, CHALK FARM, N.W.
THE BOTTLE ELEMENT.
One hundred 4 oz. bottles are arranged in one Sytam Bottle - Element occupying less than 1 sq. ft. of wall space, each bottle is instantly
located, removed or replaced, and any size from OF THE HIGHEST ACTIVITY
d-oz. to a Winchester can be accommodated in IN 5 mg. TUBES.
one and the same element. Only a Few Tubes left.
2. THE CLOSED-FRONT BOOK ELEMENT. ARMBRECHT, NELSON & CO., 3. THE OPEN-FRONT BOOK ELEMENT.
71 & 73 DUKE STREET, GROSVENOR SQUARE, W. 4 THE AUTHOR'S FILE Telephone : GERRARD, 1942.
For division of subject into headings, chapters
or sections, 18-inch Apps-Newton Coil for sale, in perfect
| 5. condition. No trace of oxidation on the vulcanite. G. BOWRON,
THE TWIN DESK TRAYS. 57 Edgware Road, W.
6. THE PAMPHLET FILE. Metallurgical Laboratory, well equipped for experimental work, to let at low rent. One minute from Station.
THE SYTAM FITTINGS CO., Fifteen minutes to City. Apply MARSHALL & Co., Campbell Works, Stoke Newington, X. (close to Station, G.E.R.). Tel., 19 Dal-ton. | 18 & 19 BASINGHALL BUILDINGS, LEEDS.
1 NATURE says :-“This is one of the most compact and efficient condensers which has come before our notice. We have tested it for condensing such volatile substances as ether, carbon disulphide, and acetone, and have found that even with rapid distillation the condensation is very complete. Generally speaking, in order to condense these substances satisfactorily, it is necessary to employ a very long condenser ; of course, this means using a great amount of bench space. As the new condensers are used in a perpendicular posi. tion, the saving in space is very great."
This apparatus, when working off a 10 in. Coil, will give from 800 to 1000
Price, as illustrated, 2-. but with New Pattern Spark Gap and New
Chaplin's Universal Holder & Electrodes,
Full particulars of above, and all other forms of ElectroTherapeutic Apparatus, are contained in our ILLUSTRATED CATALOGUE in X-RAYS, &c. (including Instructions to
Beginners), post free.
Apparatus for estimation of sulphur in
Importers, Manufacturers, and Dealers in
Plain and Stoppered Bottles, AND EVERY LABORATORY REQUIREMENT, Illustrated Catalogue of Apparatus, with Price
List of Chemicals, free on application. Telegraphic Address—"APPARATUS, MANCHESTER."
SECOND-HAND TELESCOPES. 6 in. Dallmeyer Equatorial, Clock, complete, £100, 41 in. Alvan Clark, Equatorial by Cooke, £50. Several 3 in. Student Telescopes, by
leading makers, £4 10s., £6 10s., £8 10s., £10. SECOND-HAND SPECTROSCOPES. Single, 2, and 3 Prism, by Browning, £4 10s., £8 10s., £10.
SECOND-HAND MICROSCOPES. Watson's Edinburgh H., 3 powers and fittings, complete, as new, £16 10s. Swift Army Bacieria, complete, £15. Leitz 2b, with rack,
substage, and fittings, £6 10s. MANY OTHERS, ALL KINDS. LISTS ON APPLICATION.
A. CLARKSON & CO., 28 BARTLETT'S BUILDINGS, HOLBORN CIRCUS, LONDON.
BY STANDARD MAKERS, IN PERFECT WORKING ORDER, AT
EXTREMELY MODERATE PRICES. As supplied to the National Physical Laboratory; Aberdeen, Aberystwyth, Birmingham, Nottingham and Glasgow Universities; Bedford, Bradford, Clifton, Heriot Watt and Yorkshire Colleges; and twenty other Scientific
Institutions, Polytechnics, &c. DE NATURE says: "Teachers requiring efficient apparatus at a low cost for lecture or laboratory purposes, migbt consult the list with advantage."
List on application by mentioning NATURE.
ALFRED E. DEAN,
THE LARGEST MAKER IN ENGLAND
of Apparatus in all Departments of
THE NEW PATENT
including Radiography, High Frequency, Hydro-Electric and
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To be obtained of all Opticians, or
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CLERKENWELL OPTICAL WORKS,
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HISTORY, &c., TARY and ADVANCED SCIENTIFIC BOOKS at about HALF PUBLISHED PRICE.
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Adams (Henry, F.L.S., and Arthur)-The Genera J. POOLE & CO.
of Recent Mollusca, with 138 full page plates, containing
thousands of figures arranged by Sowerby, 3 thick vols., 8vo (ESTABLISHED 1854),
(pub. £4 10s.) ... ... ... ... 16s. 6d., postage tod. 104 CHARING CROSS ROAD,
Browne (Montagu, F.G.S.)- Artistic and ScienLONDON, W.C.
tific Taxidermy and Modelling, a Manual of In-truction in (Formerly of 39 HOLYWELL STREET, STRAND)
the Methods of Preserving Natural Objects, Modelling of Foliage, Enquiries by letter receive immediate attention.
&c., 22 full-page engravings and a text illustrations, 8vo gilt
extra ( 41 is.) ... ... A. & C. BLACK, 53., postage 6d. ROYAL IRISH ACADEMY
Cooke (M. C.)—The British Fungi: A Plain and
Easy Account of, coloured plates of 40 species, cr. 8vo (65.) PROCEEDINGS.
3s., postage 4d. Volone XXV. Secti in B. No. 5. Sewed, 6d.
-Microscopic Fungi : An Introduction to the ON THE GROWTH OF CRYSTALS IN THE CONTACT
S'udy of Microscopic Fungi, Rust, Smut, Mildew, and Mould, ZONE OF GRANITE AND AMPHIBOLITE.
269 culoured figures, by J. E. Sowerby, cr. 8vo 165.)
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Dallas (W. S.)- Elements of Entomology: An WILLIAMS & NORGATE, 14 Henrietta Street, London, W.C.
Outline of the Natural History and Classification of
British Insects. Illustrated with 21 text engravings of Beetles, The Official Organ of the British Electrotherapeutic Society.
Grasshoppers, Butterflies, Moths, &c , post 8v (pub. 8s. 6d.)
1s. 6d., postage 4d. MEDICAL ELECTROLOGY Dixon (Charles)- The Story of the Birds, the
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Eggs, cr. 8vo (pub. 55.) GEORGE ALLEN, 18. 9d., postage 4d. AN INTERNATIONAL MONTHLY REVIEW COVERING ALL BRANCHES OF ELECTROTHERAPEUTICS.
Emerson (P. H.)-Birds, Beasts, and Fishes of Subscriprion, 12/- per Annum, Post Free throughout the World.
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Svo (pub 12$ 6d.)... .. .. Nutt, 4s. 6d., postage sd. LONDON: A. SIEGLE, 2 LANGHAM PLACE, W.
Greg (R. P., F.G.S.) and William Lettsom
Manual of the Mineralogy of Great Britain and Ireland,
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thick post 8vo (nearly 530 pages) (pub. 185.) 3s., postage 4d. “The best of all the seaside books which have come under our notice." Rimmer (R. — The Land and Freshwater Shells of the British Isles, illustrated, 8vo (pub. 55.)
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Taylor (J. E.)-Flowers: Their Origin, Shapes,
Perfumes, and colours, 32 coloured figures, and 161 woodcuts, With 30 Original Illustrations. Price 25. 60.
cr. 8vo (pub. 75. 6d.) ... ... ... 2s.6d., postage 4d. The HYGIENE of the MOUTH.
- The Aquarium : Its Inhabitants, Structure, and A Guide to tbo Prevention and Control of Dental Diseases.
Manageinent, with 238 woodcuts, cr. 8vo (pub. 35. 6d.) BR. DENISON PEDLEY, L.D.S. Eng., F.R.C.S. Ed.,
2s., postage 4d. Dental Surgeon to the Evelina Hospital, Southwark.
- Half-Hours at the Seaside, illustrated with BY THE SAME AUTHOR. The DISEASES OF CHILDREN'S TEETH
250 woodcuts, cr. 8vo (pub. 2s. 6d) ... ... 2s., postage 4d. Well Illustrated. Price 7s. 6d.
-Half-Hours in the Green Lanes, illustrated SEGG & CO., 289 and agı Regent Street, London, W.
with 300 woodcuts, cr. 8vo, gilt edges (pub. 25. 6d.)
2s., postaze 4d. Theobald (F. V.)—The Parasitic Diseases of
Poultry (Animal and Vegetable, including Chapters on Protozoa,
1s. 6d., postage 3d. at 1716 per pound bar, or 4 oz. 6
New Catalogue free on application, minimum. ARMBRECHT, NELSON & CO.,
JOHN GRANT, Wholesale Bookseller, 71 & 73 DUKE STREET, GROSVENOR SQUARE, W.
31 GEORGE IV. BRIDGE, EDINBURGH. Telepbone : GERRARD, 1942.
FOREIGN SCIENTIFIC BOOKS
THOMAS PRINCE, SCIENTIFIC BOOKSELLER
99.3 to 99.6
Complete in THREE VOLUMES, Hall-Bound.
Vol. III., with 352 Illustrations, 8vo, £3 3s.
A DICTIONARY of APPLIED CHEMISTRY
WORKS by G. S. NEWTH, F.I.C., F.C.S., Demonstrator in the Royal College of Science, London; Assistant Examiner in Chemistry,
Board of Education,
Tenth Edition. With 155 Illustrations. Crown 8vo. 6s. 6d.
Fifth Edition. With 100 Illustrations. Crown 8vo. 6s. 6d.
New Edition. With 230 Diagrams. Crown 8vo. 6s.
With 108 Illustrations and 254 Experiments. Crown 8vo. 2s. 6d.
LONGMANS, GREEN & CO., 39 PATERNOSTER ROW, LONDON, E.C. THE EXECUTORS OF THE LATE
ROYAL SOCIETY OF LONDON.
MACKINNON RESEARCH STUDENTSHIPS. COLONEL WATKIN, C.B. (Inventor of the Range Finder) are
There are two Studentships each of the value of £150. One of them is offering the following for sale :
awarded for research in the group of the Physical Sciences, including 1. 6 in. Holtzaffel Lathe, with divided headstock and overhead gear, 1 Astronomy, Chemistry, Geology, Mineralogy and Physics. The other is
and a very complete set of fittings, for engine, wood and metal awarded for research in the group of the Biological Sciences, including turning, with a numerous assortment of small tools.
Anatomy, Botany, Palæontology, Pathology, Physiology and Zoology,
The Studentships are awarded annually for one year, but are renew. II. 4 H.P. de Dion engine, water cooled with tanks, &c., and dynamo
1 able for a second year. Under exceptional circumstances they may be by Canning and Co., 30 volts, 20 amps..
renewed for a third year. The Studentships are restricted to Britisb III. 7-0 volt Accumulators in teak cases, 9 amps.
subjects. IV. H.P. Crocker Wheeler Motor.
Applications must be received not later than June 5. Further V. in. Spark Coil.
į particulars and forms of application can be obtained from the Assistant VI. X-Ray Apparatus, consisting of 12 in. spark coil, 3 Crookes' tubes, Secretary of the Royal Society, Burlington House, London, W. screens, &c.
GRATIS ON APPLICATION. VI. Carpenter's Bench and Tools.
Catalogue of Second-hand Books on Natural The whole can be seen hy appointment at Ordnance House, Enfield
Science, Zoology, Botany, Geology, &c., 2000 items.-W. HEFFER Lock, Middlesex, or particulars may be obtained from Mr. HICKS,
AND SONS, Booksellers, Cambridge. Mathematical Instrument Maker, 8 Hatton Garden, London,
THE ENTOMOLOGISTS' MONTHLY TO SCIENCE MASTERS, especially those
Price Sixpence, Monthly. taking ELECTRICITY as a special subject. Wanted by July ı next!
Edited by G. C. CHAMPION, F.z.s., J. W. Douglas, W. W. Fowi KR, for important College, well-qualified Master for Electricity and who
M.A., F.L.S., R. McLACHLAN, F.R.S., E. SAUNDERS, F.L.S., and has had some experience in the organisation of the work of a local
LORD WALSINGHAM, M.A., LL.D., F.R.S.
This Magazine, commenced in 1864, contains standard articles and notes
on all subiects connected with Entomology, and especially on the Insects of mencing in September next hould apply forthwith, giving details as
| the British Isles. to qualifications and enclosing copies of testimonials, to GRIFFITHS, SMITH, POWELL & SMITH. School Agents (Estd. 1833), 34 Bedford
Subscription--Six Shillings per Annum, post free. Street, Strand, London.
London : GURNEY & JACKSON (Mr. Van Voorst's Successors),
i Paternoster Row.
TWENTY-SIX CRADUATED EXERCISES IN CRAPHIC 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.
Price 10s. net.
SOC4R8, W.; OR THROUGH ANY BOOKSELLER
MICROSCOPIC SLIDES, MARINE OBJECTS, Hydrozoa extended without pressure, sponge sections, &c. Apply for Lists.
Dispersal of Mr. HORNELL'S collection. Flower and Leaf Buds, Stens, Roots, &c., new, from 3d, each. Lists.
Exhinition Groups of Diatoms, &c, in symmetrical patterns.
EDINBURGH H., by Watson, for sale, and others : several Objectives,
Fine mounted collec'ion of Grasses, Mosses, Ferns, Marine Algæ.
Tel. :1316 CENTRAL.
as devised by SIR WILLIAM CROOKES. Showing the Scintillations of Radium. Price, WITH LENS... ... ... ... $1 1 0 CHEAPER FORM OF ABOVE
Telephone 10547 Central.
RUBIDIUM, TANTALUM, GERMANIUM,
CÆSIUM, BERYLLIUM, AND OTHERS, DRAWING INSTRUMENTS. Ask for Table of Rare Elements by E. L. N. ARMBRECHT,
in Gramme Tubes at Reasonable Prices.
71 & 73 DUKE STREET, GROSVENOR SQUARE, W. Best Make and Finish.
Telephone : GERRARD, 4942.
JUST PUBLISHED. 290 pages, 8vo. cloth, price 4s. 6d. net.
| Important New Publication issued by the Chemical Society. DRAWING BOARDS. !
ANNUAL REPORTS on the PROGRESS Obtained through any Optician.
of CHEMISTRY for 1904. An eritome of the principal definite steps in advance which have been
accomplished during the year 1004. ROBERT NICHOLL, 153 HIGH HOLBORN, LONDON. GURNEY & JACKSON, 10 PATERNOSTER Row, LONDON, E.C.
RECENT & COMING ECLIPSES.
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.
MACMILLAN AND CO., LIMITED, LONDON. HARVEY & PEAK
(BY APPOINTMENT TO THE ROYAL INSTITUTION
OF GREAT BRITAIN.)
Makers of the new Apparatus illustrating Wave Motion,
designed and used by Dr. J. A. FLEMING in the Christmas Lectures at the Royal Institution.
READING MICROSCOPES, RESISTANCE COILS, &c. 56 CHARING CROSS ROAD, LONDON, W.C.
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