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BAUSCH & LOMB'S MICROSCOPES.

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NEW and IMPROVED MODELS for every branch of
Microscopical Research. Student's and Laboratory
Models for Schools, Technical Colleges, & Hospitals.

BBH8
AHı Microscope, with 3" and " objectives and i eye-piece £4 8 0

(With AH3

4 13 9

Mechanical BHI

4 11 9

Stage.) BH2

and circular dust-proof nose-piece

5 6 9 BH3 Microscope, with 3" and t" objectives and 2 eye-pieces 4 17 6 BH4

ditto, ditto, and circular dust-proof nosepiece

5 126
BH6 Microscope, ditto, ditto, and circular dust-proof nose.

piece, screw-out substage, and Abbe condenser... 7 19 6
Same Stand, with screw-out substage, but without
condenser

6 12 0
BH8 Microscope, Laboratory model, with t", }", and

12" oil immersion objectives, 2 eye-pieces,
screw-out substage, with Abbe condenser, and
triple dust-proof nose-piece

13 2 6
BB8 Microscope, complete (as BH8)

16 7 0 BBH8

18 4 6 Mechanical Stage, to fit any of above, in morccco leather

3 39

BAUSCH & LOME OPTICAL CE All Instruments are complete in fine mahogany lock and key cabinet. Also MICROTOMES, CENTRIFUGES, PHOTO- MICROGRAPHIC AND PROJECTION APPARATUS, PRECISION LABORATORY GLASSWARE, &c.

"MANIPULATION OF THE MICROSCOPE," by EDWARD BAUSCH, 4/

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S OPTICAL

OPTICAL TO

BAUSCH

The Bausch & Lomb Optical Co.,

B-L

BAUSCHS

OPTICA B-L

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ALLIANCE

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ALEOMULLER

UNISS. JERA

ALLIANCE

CONTRACTORS TO BRITISH AND FOREIGN GOVERNMENTS.
19 THAVIES INN, HOLBORN CIRCUS, LONDON, E.C.

Depot for British, Colonial, Cape, Indian, and South American Trade.
THE

FALSCHULLERS

SS.JERAS

TRADE MARK.

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POLYMETER

An accurate miniature Meteorological

Observatory for Scientific, Industrial, and Hygienic purposes.

Invaluable for Forecasting the Weather.
ir This instrument bas been accorded eulogistic
notices in "Nature" and " 'Symons's Meteorological
Magazine."
PRICES

With Cardbuard Dial 20/-
Metal

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.

CONTENTS:
Fallacies. Past & Present
Modern Scientific Facts
Chemicals

Formulae
THIS

Developers
INTERESTING BOOKLET

Sepia Toning
SENT

Intensification

Reduction
GRATIS AND POST FREE

Exposure
on receipt of postcard addressed
BURROUGHS WELLCOME & CO., 16, Snow Hill Buildings, London, E.C.

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“ Have Won More Awards Than Any Others.” MORE THAN 300 GRANDS PRIX, GOLD MEDALS, &c. Makers to H.M. the King, H.M. the Queen, H.R.H. the Prince of Wales, and other Royal Houses of Europe.

WHAT

SCIENTIFIC BOOKS & SCIENTIFIC PERIODICALS

Purchased in any quantities for cash. No charge is made for estimates, and all expenses of packing,

clearing and carriage are borne by us. Payment is made immediately upon acceptation of offer. W. HEFFER & SONS, Booksellers,

CAMBRIDGE.

about

Celebrities Say SANATOGEN

A GREAT LITERARY

FIND": A firm who can supply cheaper, cleaner copies of any pro. curable books or journals than any other firm in the trade, and twice as quickly. Lists of wants are invited. Address: E. GEORGE & SONS, Wholesaler Retails and

Export Booksellers, 151 Whitechapel Road, London, Eng.

r We can supply a complete bound set of "Nature."

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255. ; Debrett's Peerage, 1907, 2 vols., 335., for 6s. 6d. ; Business Cyclopedia, 7 vols., 525. 6d., for zos. ; Connold's British Vegetable Galls, 159., for 8s. 6d.; Indiar. Art at Delhi, 1904, 125. net, for 6s. ; Crawley's Tree of Life, 125., for 6s. 6d. ; Harvie-Brown's Travels of a Naturalist in Northern Europe, 2 vols., 635., for 1os. 6d.; Kappel and Kirby's British and European Butterflies, coloured plates: 255. net, for 125. 6d. ; Furnival's Leadless Decorative Tiles, Faience and Mosaic, £6 6s., for 215. ; Harmsworth's Encyclopædia, 56s., 10 vols., for 32s. ; Staffordshire Pots and Potters, 215., for ios. 6d. ; Cust's Authentic Portraits Mary Queen of Scots, 635., for 185. 6d.; A. R. Wallace's My Life, 2 vols., 255. net, for 8s. 6d. , Plunket's Ancient Calendars and Constellations, gs., for 45. 61.; Scberren's Zoological Society of London, 305., for jos. 6d. ; Johns' Flowers of the Field, coloured plates, 75. 64.; Round's Federal England, 125. 6d., for 6s. 6d.-Baker's GRÉAT BOOKSHOPS, 14 and 16 John Bright Street, Birmingham.

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References in principal towns at home and abroad.

Ten thousand doctors have written in praise of Sanatogen.

Thirty thousand doctors throughout the world are known to prescribe it.

Hundreds of thousands of people have been restored from conditions of grave illness to complete health by its use. Among them are many well-known men and women who have voluntarily testified to the debt they owe Sanatogen in restoring their health.

A selection from their letters is published below. The Right Rev. the The Rev. Father Bishop of Norwich.

Bernard Vaughan. "Mrs. Sheepshanks is taking Sanatogen promises when you Sanatogen regularly, and deriving are run down lo pick you up. I great benefit from it."

does so." Sir Gilbert Parker, M.P. Sir William Bull, M.P. "I have used Sanatogen with

"I have much pleasure in extraordinary benefit. It is to my stating that I consider your pre mind a true food tonic, feeding paration, Sanatogen, is of decided the nerves, increasing the energy,

value. It performs that which it and giving fresh vigour to the

promises to do, and I have recomover.worked body and mind."

mended it to several friends" Madame Sarah Grand,

Mr. Hall Caine, " Sanat

the celebrated the gifted Authoress :

Author: "My cgen bas done everything for me

experience of Sanatogen has been which it is said to be able to do

that as a tonic nerve food it has for cases of nervous debility and

on more than one occasion doce exhaustion. I began to take it

me good." after nearly four years' enforced Mr. Henry Arthur Jones, idleness from extreme debility, and felt the benefit almost imme. the famous Dramatist : "Sanat. diately."

ogen seems to me a very valuable food and

tonic. I have Lord Ronald

several times taken a course of i:

when I've been run down, and Sutherland Gower, always with excellent results." the Sculptor and Historian : “I feel it only due to the benefit conferred on my general health by the well-known Writer : " SanatSanatogen to write and inform ogen appears to be of real value those interested in tbat wonderful to the brain worker, a useful food medicine that in a couple of

and tonic combined. I can give months' time it has cured me of it high praise from personal all gouty trouble."

experience. Mr. Max Pemberton,

Maxwell Gray,

the Writer: "I have found the Author : "I have been taking Sanatogen since the beginning of

Sanetogen helpful in digestive

troubles and nervous weakness, the year, and would not be with

I have taken it from time to time out it under any circumstances whatsoever.'

under medical advice." Mr. E. F. Benson,

Dr. C. W. Saleeby,

the well-known Medical Author: the well-known Author : "I have

"Sanatogen is a specially adapted tried Sanategen, and believe it to food that has solved the problem be an excellent tonic."

of giving pbosphorus in such a

way that the nervous system can Dr. Andrew Wilson, take hold of it." the distirguished Scientist : "I Madame Clara Butt, have found the ideal tonic and restorative in Saratogen. Re- the famous Contralto: "It gives covering from influenza, and me great pleasure to testify to the suffering from severe weakness, I very great benefit I bave derived gave Sanatogen a fair trial, and from using Sanatogen during my without the use of any other professional work. It certainly medicine or preparation I was has proved one of the best restor restored to healıb.

atives I know of." Sanatogen can be obtained from all chemists, in tins from IS. 9d. to gs. 6d. A beautifully illustrated pamphlet, containing much valuable information, will be sent to you, post free, on receipt of a postcard addressed to the Sanatogen Company, 12 Chenies-street, London, W.C.

Mr. Eden Phillpotts,

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MINERALOGY & GEOLOGY. WATKINS & DONCASTER,

Naturalists and Manufacturers of CABINETS AND APPARATUS FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL

BRANCHES OF NATURAL HISTORY.

NEW MINERAL PREPARATIONS. We have now tiken up the making of mineral preparations, which, owing to our usually large stock of fine crystals, we can furnish in the very best uality and at reasonable prices.

NEW COLLECTION OF 100 MINERAL PREPARATIO in ditterent qualities. Price according to quality, 720.—, 1100.-, 1400.-, 2000.- Marks.

Among other minerals this collection contains Crystal-plates perpendicular to the I. Bisectrix of BENITOITE (M. 8.- to 20.--), DANBURITE (M. 10.– to 30.-), EUCLASE (M. 12.– to 40.-), KUNZITE M. 8.- 10 25.-), RUBIS (artificial), M. 8.- to 25.

Pieces in the form of a parallelopipedon, showing Pleochroism, RUBELLITE, light and dark red (M. 14.-10 50.--); KUNZITE, colourless and amethystine (M. 15.- to 40.-).

NEW PRISMS OF SINGLE AND DOUBLE REFRACTING minerals for crystallographic.optical exercises of students : Garnet, Fluorspar, Quartz, Tourmaline, &c.

We specially point to our COLLECTION OF THIN SECTIONS for petrographical studies : 1. New large collection of 225 orientated thin sections,

arranged according to Rosenbusch-Wülfing : Microscopical Physiography of the rock-forming minerals (134 minerals are repre. sented in this collection)

M. 385.II. Petrographical collection of 114 sections, showing the

mode of occurrence of the rock-forming minerals
III. Petrographical collection of 80 sections, showing the
microstructure of the rock-forming minerals

M. 150,-
Dr. F. KRANTZ,
RHENISH MINERAL OFFICE, BONN.ON-RHINE, GERMANY.
ESTABLISHED 1833.

ESTABLISHED 1833.

SPECIAL SHOW-ROOM FOR CABINETS.
N.B. -For Excellence and Superiority of Cabinets and Apparatus,
references 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.)
I CATALOGUE (102 pp.) POST FREE.

5

M. 145.

LIVING SPECIMENS FOR

THE MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stepbanoceros, Melicerta, and many other specimens of Pond Life. Price is: per Tube, Post Free. Helix pomatia, Astacus, Ampbioxus, Rana, Anodon, &c., for Dissection purposes.

THOMAS BOLTON, 25 BALSALL HEATH ROAD, BIRMINGHAM.

Sales by Auction.
STEVENS' AUCTION ROOMS. Estd. 1760.
A Sale by Auction is held EVERY FRIDAY

at 12.30, which affords first-class cpportunities for the disposal or
purchase of SCIENTIFIC AND ELECTRICAL APPARATUS,
Microscopes and Accessories, Surveying Instruments, Photographic
Cameras and Lenses, Laihes and Tools, Cinematographs and Films,

and Miscellaneous Property. Catalogues and terms for selling will be forwarded on application to

Mr. J. C. STEVENS, 38 KING STREET, COVENT GARDEN, LONDON, W.C.

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, Apbrodite, 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.

THE DIRECTOR.

GEOLOGISTS' AND MINERALOGISTS'

REQUISITES.

BIRKBECK BANK

Collections of Minerals, Rocks, or Fossils, from 5/6

Sections of Rocks and Minerals, 11- each. Rectangular or Round Glass-capped Boxes, from 1/- dozen. Hammers, detachable heads and iron-bound shafts, from 3/6 Cabinets and Boxes, from 4,6 Card Trays, from 3/6 gross.

Dichroiscope, 12/6 Specific Gravity Balance, 36/

Catalogue of Colletions, Specimens, and Apparatus, post free. THOMAS D. RUSSELL, 11 John Street, Bedford Row, London, W.C.

ESTABLISHED 1851.
SOUTHAMPTON BUILDINGS, HIGH HOLBORN, W.C

21 PER CENT. INTEREST

allowed on Deposit Accounts
2 PER CENT. INTEREST

on Drawing Accounts with Cheque Book.

All general Banking Business transacted.
ALMANACK, with full particulars, POST FREE,

C. F. RAVENSCROFT, Secretary.

A Class Book of Physics.

By Prof. R. A. GREGORY and H. E. HADLEY,

B.Sc. Illustrated. Crown 8vo. 45. 6d. Parts I., II., and III., Fundamental Measurements, Hydrostatics and Mechanics, Heat, 25. ; Parts III., IV., and V., Heat, Light, and Sound, 25. ; Parts IV. and V., Light and Sound, is. 6d. ; Parts VI., VII., and VIII., Magnetism, Static Electricity, Voltaic Electricity, is. 61.

(Friday. NEW IMPRESSION, THOROUGHLY REVISED.

Py Sir LOCKYER,

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Illustrated. Fcap. Svo.

55. 6d.

Elementary Lessons in Astronomy. RC MOED.N.S.E.RS: Cotton Spinning Calculations. B. WILLIAM SCOTT TAGGART, Problem Papers in Mathematics on the Lines

of Examinations by the Civil Service Commission with Revision Papers in Trigonometry, Co-ordinate Geometry, Mechanics and

of

M.I.
Machinery Sketches” and “Cotton Spinning." Fully illustrated. Crown 8vo.

43. net.

Calculus. By R. C. FAWDRY, M.A. Crown 8vo. With Answers, 45. 6d. ; without Answers, 35. 60.

MACMILLAN AND CO., LTD., LONDON.

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ILLUSTRATED LIST POST FREE.
U NATURE says :-" The catalogue makes the selection of a suitable

instrument of any design a simple matter.'

ISENTHAL & co., TOWNSON & MERCER, ,

(Department 1), 85 MORTIMER STREET, LONDON, W. Contractors to the Admiralty, War, India, ani Colonial Offices, &c.

34 CAMOMILE STREET, LONDON, E.C. Telegrams : “Townson, London." Telephone : London Wall 5754.

THE 'SOHO' REFLEX CAMERA

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(ENGLISH JADE THROUGHOUT).
THE PREMIER REFLEX.
For Quality, Precision, Durability,

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REFLEX OUTFITS

FOR
NATURALISTS & TELEPHOTO WORK.

Prices :-
Camera, without Lens, but with

3

Double
Blockform Backs-
4-plate £12 O

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12 10 i-plate 24 10 Write for the 26-page Illustrated Booklet

of the SOHO' REFLEX.

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MARION'S 'PERFECTION'FIELD CAMERA.

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BEST MATERIALS.

SUPERIOR WORKMANSHIP. Fitted with brass turn. table, 3-fold sliding tripod and 3 double dark slides,

book-form For 64 X 4

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NEW ILLUSTRATED CATALOGUE

200 pp., Post Free

on application, • We invite Correspondence on all matters relating to Photography, MARION

&
& CO..

CO., LTD.,

22, 23 SOHO SQUARE, LONDON, W. Printed by RICHARD CLAY & 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, Sept. 16, 1909.

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE.

To the solid ground

Of Nature trusts the mind which builds for aye."-WORDSWORTH.
No. 2082, Vol. 81] THURSDAY, SEPTEMBER 23, 1909 [PRICE SIXPENCE
Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved.
Newton's New Demonstrator's

REYNOLDS & BRANSON, Ltd. s Transpaque" Lantern

This Lamp can be supplied geared

for Alternating Current. Has all the advantages

Catalogue of Lanterns, &C., of our well-known

24 ., post free. Demonstrator's' Lanterns, and in -addition will show brilliantly on the

screen, opaque objects or book illustrations, if not

larger than a large postcard.

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The R. & B." Phenix” Arc Lamp, with nearly parallel motion, for optical

lantern; hand feed. Can be fitted to any ordinary lantern £2 2 0 A-Striking Gear. B-Adjustment for altering inclination of carbon. CAdjustment for carbon. D-Milled head screw for altering distance of carbons. E–Vertical adjustment of radiant. F- Horizontal adjustment for radiant. 14 COMMERCIAL STREET, LEEDS.

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THE "LONDON” I NEGRETTI & ZAMBRA'S
MICROSCOPE,

Latest METEOROLOGICAL INSTRUMENT.

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A New Form for Research Work.

(THE RECENT MODEL.) Slow motion four times

finer than usual.
Swing-out centring and

focussing substage.
Iris diaphragm in stage

level with surface.
Finder divisions to

mechanical stage, &c.

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R. & J. BECK, LTD.,

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