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TOWN HALL, LEE K.

MONDAY, JULY 26, 1909. FERGYSON & SON, instructed by the

Exors. of the late Sir Thomas Wardle, will sell as above, the costly modern MICROSCOPES with all Accessories, by Beck and other well-known makers, representing many hundreds of pounds in value. TELESCOPES, OPERA GLASSES, MAGIC LANTERNS, SILK PRODUCING MOTHS in CABINETS, BUTTERFLIES, GEOLOGICAL SPECIMENS, &c., also complete X-RAYS and APPARATUS. Business at 1 and 6 p.m. Catalogues with full details one week before Sale (free) from the Auction, Valuation, Estate, Insurance and Shipping Agency Offices, Ball Haye Road, Leek.

UNIVERSITY OF BIRMINGHAM.

CHAIR OF ZOOLOGY. The Council announces that the CHAIR of ZOOLOGY is vacant through the death of Professor T. W. Bridge.

Applications, accompanied by 65 copies of testimonials, will be received before September 18.

The stipend is £600 per annum.
The Session will begin October 1, 1909.
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important Public School, one with Hons. Degree looked for. Salary, £140, resident. Many other vacancies for Mathematical and Science Masters. Apply giving full details and enclosing copies of testimonials, to GRIFFITHS, SMITH, Powell & Smith, Tutorial Agents, 34 Bedford

Street, Strand, London. SCIENTIFIC INSTRUMENT TRADE.

Advertiser, 30, ten years' experience with leading firms, desires partner. ship or post with view to same. Well educated; good qualifications.

No. 2072, NATURE Office. WANTED: RADIUM.- Armbrecht, Nelson & Co., 71

and 73 Duke Street, Grosvenor Square, London, W. MOSQUITOES, GNATS and FLIES will

not attack if a little of Ambrecht's Pyrethrum is put on the skin. protects for about 12 hours, and also cures stings of any insects-wasps and bees included. Price 25. od. post free U.K. ; Germany, Holland and English Colonies 1s., France and Italy is. 6d, extra.- Armbrecht,

Nelson & Co., 71 and 73 Duke Street, Grosvenor Square, London, W. TYPE-WRITING UNDERTAKEN BY

HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN. TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher Local). Modern Languages. Research, Revision, Translation, Sbort. hand. Dictation Room. The Cambridge Type-writing Agency,

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Etc.

PRISM
BINOCULARS,
TELESCOPES,
MICROSCOPES.

CLARKSON'S

SECOND-HAND
OPTICAL MART,
338 HICH HOLBORN,

LONDON, W.C.
(Opposite Gray's Inn Road.)

JENA LABORATORY GLASSWARE.

SCHO

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THE “RICID" SERIES

OF DRAWING INSTRUMENTS.

25 St.

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Awarded Silver Medal at Franco-British Exhibition, 1908

Estab
ASTON & MANDER, Ltd.
BOILING FLASKS, BEAKERS,

1809
RETORTS, TEST TUBES, TUBING
FOR EXPLOSION FURNACES,

COMPOUND TUBING (D.R.P.) Resisting in a high degree sudden changes of temperature and the

action of corrosive chemicals. Combustion Tubing for Elementary Analysis. (Proce

Price list sent free TRADE MARK.

free)

on application.
SCHOTT & GEN. Glassworks, Jena (GERMANY).
The Jena Glasses are, amongst others in the U.K., on sale with
the following firms :

Fitted with the Improved Rigid Head Joint and Straight Bow
Aberdeen.
Manchester.

Handle Device.
A. & J. SMITH, 23 and
FREDK. JACKSON Co.,

SPECIAL PAMPHLET NOW READY.
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14 Cross Street.

Full Catalogues sent Post Free on application.
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ORME & Co., Ltd., 17 & 19 61 OLD COMPTON ST., SOHO, LONDON, W. F. E. BECKER & CO. (W. and

Russell Street, London Road.
J. George, Ltd., Successors), 159 JAMES WOOLLEY, SONS &
and 160 Great Charles Street.
Co., Ltd., Victoria Bridge.

DENT'S ASTRONOMICAL CLOCKS,
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SIDEREAL OR MEAN TIME CLOCKS FOR OBSERVATORIES, £21 & UPWARDS. STANDLEY BELCHER & MASON, Ltd., Church Street, BRADY & MARTIN, Ltd.

1 Nature says: “Should find its way into many

observatories where an accurate instrument is required Dublin.

at a moderate cost. For the sum of £21 they supply a London.

clock with a 10-inch dial, dead-beat escapement, and PHILIP HARRIS & Co., Ltd., F. E. BECKER & CO. (W. and J.

wooden rod seconds pendulum in a solid mahogany 179 Great Brunswick Street, George, Ltd., Successors), 33 10 37

case and after examining the instrument we have no Leods. Hatton Wall, Hatton Garden, E.C.

hesitation in pronouncing it a marvel of cheapness."

E. DENT & CO., Ltd., REYNOLDS & BRANSON, Ltd., A. GALLENKAMP & Co., Ltd., 14 Commercial Street.

Watch, Clock, and Chronometer Makers 19 & 20 Sun Street, Finsbury, E.C.

By Special Appointment to H.M. the King.
And other leading Wholesale Houses.

Makers of the Great Westminster Clock, Big Bon. Makers of the
Standard Clock of the Royal Observa-

tory, Greenwich, and the Principal
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Only Addresses

61 STRAND,

And 4 ROYAL EXCHANGE, LONDON. 14 CROSS STREET, MANCHESTER.

g 3 Grand Prizes and 1 Gold Medal, Franco-British

Exhibition.
Good8 Entrance : 10 Half-Moon Street.
LABORATORY FURNISHERS.
Importers, Manufacturers, and Dealers in

NEW AND SECOND HAND.
CHEMICAL AND PHYSICAL APPARATUS
Of every Description.

SECOND-HAND TELESCOPES ON STOCK.

29" Dollond, £8 10s.; 3" Wray, £12 10s. ; 34" Cooke, £22 10s.; FINE CHEMICALS, VOLUMETRIC SOLUTIONS. * Cooke, £30; 3" Dollond (Student), £10; 3?" Wray, £14;

31" Cooke, £25; and others. EYEPIECES from 7s. 6d. each. PLAIN AND STOPPERED BOTTLES,

Prismatic Binoculars by every known Maker. Exchanges arranged. AND EVERY LABORATORY REQUIREMENT.

NEW PRISMATIC, 8X, £4 4s. ; 12X, £6 6s.
Illustrated Catalogue of Apparatus, with Price List of
Chemicals, free on application.

BROADHURST, CLARKSON & CO., Manufacturing Opticians,
Telegraphic Address—"APPARATUS, MANCHESTER.”

63 Farringdon Road, London, E.C. (30 years at 28 Bartlett's Bldgs.). Telephone Number-2038.

BARGAINS IN BOOKS, all new.-Harmsworth Atlas: sos., for

25$. ; Debrett's Peerage, 1907, 2 vols., 335., for 6s. 6d. ; Business Cyclopedia, 7 vols., 525. 6d., for 30s. ; Connold's British Vegetable Galls, 155., for 8s. 60.; Indian Art at Delhi, 1904, 125. net, sor 6s.; Crawley's Tree of Life, 125., for 6s. 6d. ; Harvie-Brown's Travels of a Naturalist in Northern

Europe, 2 vols., 635., for 10s. 6d.; Kappel and Kirby's British and European
Scrap, &c., valued or purchased.

Butterflies, coloured plates. 255. net, for 125. 6d.; Furnival's Leadless
Decorative Tiles, Faience and Mosaic, £6 6s., for 215.; Harmsworth's
Encyclopædia, 565., 10 vols., for 325. ; Staffordshire Pots and Potters, 218.,

for ios. 6d.; Cust's Authentic Portraits Mary Queen of Scots, 635., for 30 CORNHILL, E.C., & 17 & 18 PICCADILLY, LONDON, W.

185. 6d.; A. R. Wallace's My Life, 2 vols., 25š. net, for 8s. 6d. , Plunket's

Ancient Calendars and Constellations, gs., for 45. 6d.; Scherren's Zoological ESTD. 1772.

Society of London, 305., for ios. 6d. ; Johns' Flowers of the Field, coloured Gems for experimental work at moderate prices.

plates, 7s.6d.; Round's Federal England, 125. 6d., for 6s. 60.–BAKER'S GREAT BOOKSHOPS, 14 and 16 John Bright Street, Birmingham.

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MARK

FREDK. JACKSON & CO., Ltd.,

TRADE

DENT

TELESCOPES

OLD PLATINUM, GOLD

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SCIENCE PROGRESS IN THE TWENTIETH CENTURY.

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