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BAUSCH & LOMB'S MICROSCOPES.

NEW and IMPROVED MODELS for every branch of
Microscopical Research. Student's and Laboratory
Models for Schools, Technical Colleges, & Hospitals.
AHI Microscope, with " and " objectives and I eye-piece

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AH3
BHI
BH2

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circular dust-proof nose-piece

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BH3 Microscope, with 3" and "objectives and 2 eye-pieces
BH4
ditto, ditto, and circular dust-proof nose-
piece
BH6 Microscope, ditto, ditto, and circular dust-proof nose-
piece, screw-out substage, and Abbe condenser...
Same Stand, with screw-out substage, but without
condenser

BH8 Microscope, Laboratory model, with 3", ", and
12" oil immersion objectives, 2 eye-pieces,
screw-out substage, with Abbe condenser, and
triple dust-proof nose-piece

BB8 Microscope, complete (as BH8)
BBH8

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All Instruments are complete in fine mahogany lock and key cabinet. Also MICROTOMES, CENTRIFUGES, PHOTO- MICROGRAPHIC PROJECTION APPARATUS, PRECISION LABORATORY GLASSWARE, &c. "MANIPULATION OF THE MICROSCOPE," by EDWARD BAUSCH, 4/

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The Bausch & Lomb Optical Co.,

CONTRACTORS TO BRITISH AND FOREIGN GOVERNMENTS.

19 THAVIES INN, HOLBORN CIRCUS, LONDON, E.C.
Depot for British, Colonial, Cape, Indian, and South American Trade.

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on receipt of postcard addressed

Formulae

Developers

Sepia Toning
Intensification

Reduction
Exposure

BURROUGHS WELLCOME & CO., 16, Snow Hill Buildings, London, E.C.

"THE BEST IN THE SHOP."

Fry's

Cocoas and

Chocolates

"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.

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.

"A GREAT

LITERARY

FIND":

A firm who can supply cheaper, cleaner copies of any procurable books or journals than any other firm in the trade, and twice as quickly. Lists of wants are invited. Address: Export Booksellers,

E. GEORGE & SONS, Wholesale, Retail, and 151 Whitechapel Road, London, Eng. We can supply a complete bound set of “Nature."

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

for

255.; Debrett's Peerage, 1907, 2 vols., 335., for 6s. 6d.; Business Cyclopedia, 7 vols., 52s. 6d., for 30s.; Connold's British Vegetable Galls, 155., for 8s. 6d.; Indian 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., 63s., for 10s. 6d.; Kappel and Kirby's British and European Butterflies, coloured plates. 255. net, for 12s. 6d.; Furnival's Leadless Decorative Tiles, Faience and Mosaic, 6 6s., for 215.; Harmsworth's Encyclopædia, 56s., 10 vols., for 325.; Staffordshire Pots and Potters, 215., for 10s. 6d. Cust's Authentic Portraits Mary Queen of Scots, 635., for 18s. 6d. ; A. R. Wallace's My Life, 2 vols., 255. net, for 8s. 6d. ; Plunket's Ancient Calendars and Constellations, 9s., for 4s. 6d.; Scherren's Zoological Society of London, 30s., for 10s. 6d.; Johns' Flowers of the Field, coloured plates, 75. 6d.; Round's Federal England, 125. 6d., for 6s. 6d.-BAKER'S GREAT BOOKSHOPS, 14 and 16 John Bright Street, Birmingham.

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Estab.] J. POOLE & CO. [1854. 104 CHARING CROSS ROAD, LONDON. Enquiries by letter receive immediate attention.

MINERALOGY, GEOLOGY & PETROLOGY.

Single Specimens and Collections for Prospectors, Teachers and Students. Rock Sections, Well-cut. Fossils from all Formations. Metallic Ores from all Parts. Minerals for Chemical Purposes. LISTS FREE from

JAMES R. GREGORY & CO., Mineralogists, 139 FULHAM ROAD, SOUTH KENSINGTON, S.W. Telephone No. 2841 Western. Tel. Add., "Meteorites," London.

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Sir Gilbert Parker, M.P. Sir William Bull, M.P.

"I have used Sanatogen with extraordinary benefit. It is to my mind a true food tonic, feeding the nerves, increasing the energy, and giving fresh vigour to the over-worked body and mind."

Madame Sarah Grand,

the gifted Authoress: "Sanatcgen has done everything for me which it is said to be able to do for cases of nervous debility and exhaustion. I began to take it after nearly four years' enforced idleness from extreme debility, and felt the benefit almost immediately."

Lord Ronald

Sutherland Gower,

the Sculptor and Historian: "I feel it only due to the benefit conferred on my general health by Sanatogen to write and inform those interested in that wonderful medicine that in a couple of months' time it has cured me of all gouty trouble."

Mr. Max Pemberton,

the Author: "I have been taking Sanatogen since the beginning of the year, and would not be without it under any circumstances whatsoever."

Mr. E. F. Benson,

the well-known Author: "I have tried Sanatogen, and believe it to be an excellent tonic."

Dr. Andrew Wilson,

the distinguished Scientist: "I have found the ideal tonic and restorative in Sanatogen. Recovering from influenza, and suffering from severe weakness, I gave Sanatogen a fair trial, and without the use of any other medicine or preparation I was restored to health.'

"I have much pleasure in stating that I consider your preparation, Sanatogen, is of decided value. It performs that which it promises to do, and I have recommended it to several friends."

Mr. Hall Caine,

the celebrated Author: "My experience of Sanatogen has been that as a tonic nerve food it has on more than one occasion done me good."

Mr. Henry Arthur Jones,

the famous Dramatist: "Sanatogen seems to me a very valuable food and nerve tonic. I have several times taken a course of it when I've been run down, and always with excellent results."

Mr. Eden Phillpotts,

the well-known Writer: "Sanatogen appears to be of real value to the brain worker, a useful food and tonic combined. I can give it high praise from personal experience.'

Maxwell Gray,

the Writer: "I have found Sanatogen helpful in digestive troubles and nervous weakness. I have taken it from time to time under medical advice."

Dr. C. W. Saleeby,

the well-known Medical Author: "Sanatogen is a specially adapted food that has solved the problem of giving phosphorus in such a way that the nervous system can take hold of it."

Madame Clara Butt,

the famous Contralto: "It gives me great pleasure to testify to the very great benefit I have derived from using Sanatogen during my professional work. It certainly has proved one of the best restor atives I know of."

Sanatogen can be obtained from all chemists, in tins from Is. 9d. to 9s. 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.

MINERALOGY & GEOLOGY. WATKINS & DONCASTER,

NEW MINERAL PREPARATIONS.

We have now taken 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 PREPARATIONS in different 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. to 25.-), RUBIS (artificial), M. 8.- to 25.

Pieces in the form of a parallelopipedon, showing Pleochroism, RUBELLITE, light and dark red (M. 14.—to 50.-); KÜNZITE, 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:

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1. New large collection of 225 orientated thin sections, arranged according to Rosenbusch-Wülfing: Microscopical Physiography of the rock-forming minerals (134 minerals are represented in this collection) M. 385.II. Petrographical collection of 114 sections, showing the mode of occurrence of the rock-forming minerals M. 145.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.

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, Lathes 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.

GEOLOGISTS' AND MINERALOGISTS'
REQUISITES.

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

Sections of Rocks and Minerals, 1/- each. Rectangular or Round Glass-capped Boxes, from 1/- dozen. Hammers, detachable heads and iron-bound shafts, from 3/6 Cabinets and Boxes, from 46 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.

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,
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.)

☛☛☛ CATALOGUE (102 pp.) POST FREE.

LIVING SPECIMENS FOR

THE MICROSCOPE.

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

25 BALSALL HEATH ROAD, BIRMINGHAM.

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.

THE DIRECTOR.

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A Class Book of Physics.

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.

By Prof. R. A. GREGORY and H. E. HADLEY,
B.Sc. Illustrated. Crown 8vo. 4s. 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, 15. 6d.

NEW IMPRESSION, THOROUGHLY REVISED.

Elementary Lessons in Astronomy.

Illustrated. Fcap. 8vo.

5s. 6d.

[Friday.

Fy Sir NORMAN LOCKYER,

LED D.Sc. F.R.S. Cotton Spinning Calculations. By WILLIAM SCOTT TAGGART.

Machinery Sketches" and "Cotton Spinning." Fully illustrated. Crown 8vo.

M.I. Mech. E., Author of "Cotton

45. net.

Problem Papers in Mathematics on the Lines

of Examinations by the Civil Service Commission with Revision Papers in Trigonometry, Co-ordinate Geometry, Mechanics and Calculus. By R. C. FAWDRY, M. A. Crown 8vo. With Answers, 4s. 6d. ; without Answers, 3s. 6d.

MACMILLAN AND CO., LTD.. LONDON,

JUST READY.

10th Edition.

TOWNSON & MERCER'S

ELECTRICAL MEASURING INSTRUMENTS

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NATURE says: " Contains well-illustrated information of
a great variety of instruments designed to be of assistance in
giving instruction in all branches of physics. Some parts of
the catalogue, with their full descriptions and well-executed
drawings of important pieces of apparatus, partake of the
character of a practical text-book of physics. Teachers in
charge of hysical laboratories should see that a copy of the
catalogue is added to their works of reference."

Copies sent Free to Schools and Institutions.

TOWNSON & MERCER, 34 CAMOMILE STREET, LONDON, E.C.

Telegrams: "Townson, London." Telephone: London Wall 5754

THE 'SOHO' REFLEX CAMERA

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

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Simplicity.

We make a speciality of REFLEX OUTFITS

FOR

NATURALISTS & TELEPHOTO WORK.

Prices:

Camera, without Lens, but with 3 Double
Blockform Backs-

4-plate £12 0 5X4

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54 × 34

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£18 0 24 10

12 10 Write for the 26-page Illustrated Booklet of the SOHO REFLEX.

MARION'S PERFECTION' FIELD CAMERA.

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BEST MATERIALS. SUPERIOR WORKMANSHIP. Fitted with brass turntable, 3-fold sliding tripod and 3 double dark slides, book-form:

For 64×4

184×6

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12 X 10

£8 5 9 15

14 10

Other sizes in proportion.

FULL DETAILS ON

APPLICATION.

NEW ILLUSTRATED CATALOGUE,

200 pp., Post Free on application.

... We invite Correspondence on all matters relating to Photography.

& 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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Library

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