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Barbican Optical Works, 66, Barbican, London, E.C. MICROSCOPICAL

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SPECIALITIES.

Sixteen Specimens of Soundings collected by the Challenger' Expedition, 1s. 3d. each, postDirect from the late Sir Wyville Thomson. See following extract:-"I have sent none of the Challenger' Materials to any one but yourself."-Bonsyde, Linlithgow, N.B., June 7th, 1877.

J. T. NORMAN, OPTICIAN, &c., 178, CITY ROAD, LONDON, E.C. ESTABLISHED 1848. Prize Medal and Certificates for Excellence of Manufacture. Micro Troughs, Tanks, Cells, &c., made to any Size and Shape. Largest Selection of Typical Rock Sections in London, all correctly named, Is. 6d. each, post-free.

NOW IN THE PRESS.

A NEW BOOK BY THE EDITOR OF "SCIENCE-GOSSIP."

OUR COMMON

BRITISH

AND WHERE TO FIND THEM.

FOSSILS,

By J. E. TAYLOR, Ph.D., F.G.S., &c., Author of "The Sagacity and Morality of Plants." With over 300

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Illustrations. Crown 8vo, cloth extra, 7s. 6d.

CHATTO AND WINDUS, PICCADILLY, W.

REMEDY FOR INDIGESTION.

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CAMOMILE PILLS

Are confidently recommended as a simple but certain Remedy for Indigestion, which is the cause of nearly all the diseases to which we are subject, being a medicine so uniformly grateful and beneficial, that it is with justice called the "Natural Strengthener of the Human Stomach." "Norton's Pills" act as a powerful tonic and gentle aperient; are mild in their operation, safe under any circumstances, and thousands of persons can now bear testimony to the benefits to be derived from their use, as they have been a never-failing Family Friend for upwards of 50 years. Sold in Bottles at Is. Id., 2s. 9d., and IIs. each, in every Town in the Kingdom.

CAUTION.

Be sure to ask for "NORTON'S PILLS" and do not be persuaded to purchase an imitation.

DR. ROOKE'S ORIENTAL PILLS & SOLAR ELIXIR.

THESE WELL-KNOWN FAMILY MEDICINES have had a continually increasing sale throughout the United Kingdom and the British Colonies since their introduction in 1836, and are especially noted for their STRENGTHENING and RESTORATIVE Properties; hence their invariable success in the RELIEF and CURE of

INDIGESTION,

LIVER COMPLAINTS,
ASTHMA,

BRONCHITIS,

PULMONARY CONSUMPTION,
RHEUMATISM,

GOUT, SCROFULA,
GENERAL DEBILITY,

AND ALL DISEASES OF THE NERVOUS SYSTEM,

Whether arising from a sedentary mode of life, unhealthy occupation, insalubrious climate, or any other cause.

The ORIENTAL PILLS AND SOLAR ELIXIR

Are prepared only by CHARLES ROOKE, M.D., SCARBOROUGH. The PILLS are sold in boxes, at Is. 1d. and 4s. 6d. each; the ELIXIR in Bottles at 4s. 6d. and 11s. each, duty included. Around each Box and Bottle are wrapped Directions for the Guidance of Patients in all Diseases.

DR. ROOKE'S HANDY POCKET-GUIDE TO HEALTH

AND

HEALTH-RESTORING PLACES.

FULL OF PLEASING ILLUSTRATIONS AND USEFUL INFORMATION, 88 PAGES. This Book may be obtained from any PATENT MEDICINE VENDOR, or POST FREE from DR. ROOKE, Scarborough, England, on receipt of PENNY POSTAGE STAMP.

CROSBY'S

BALSAMIC

COUGH ELIXIR

Is the leading Medicine of the day, and is specially recommended by several eminent Physicians. It has been used with the most signal success for Asthma, Bronchitis, Consumption, Coughs, Influenza, Consumptive Night Sweats, Spitting of Blood, Shortness of Breath, &c., and is a most valuable adjunct to Dr. ROOKE'S Medicines in all affections of the Throat and Chest.

CROSBY'S BALSAMIC COUGH ELIXIR is sold everywhere, by all Chemists and Patent Medicine Vendors at the following prices:-1s. 1 d., 1s. 9d., 4s. 6d., and 11s. each Bottle. A great saving is effected by purchasing the large Bottles. Full Directions with each Bottle.

LONDON: PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS

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MICROSCOPIC PREPARATIONS.

FIRST-CLASS SPECIMENS, New and Rare Objects in every Department of Microscopy.
LORD S. G. OSBORNE'S DIATOMESCOPE, Post-free, 12s.

See "English Mechanic," August 22nd, page 561.

Five Typical Examples of Blood Discs on one Slide, Man, Fish, Bird, Snake, and Frog, Double Stained, 3s. 6d. post-free. Koch's Cholera bacillus, 2s. 6d. post-free.

ERNEST HINTON,

12, VORLEY ROAD, UPPER HOLLOWAY, LONDON, N.
(TWENTY YEARS WITH THE LATE E. WHEELER.)

CITY MICROSCOPICAL STUDIO AND GEOLOGICAL MUSEUM,
For the Sale of Microscopic Objects, Minerals, Fossils, Rock Specimens, Shells,
Crustacea, Echinoderms, Corals, Flint Implements, Cabinets,
Geologists' Hammers, &c.

THOMAS D. RUSSELL, 78, NEWGATE STREET, E.C.,

CLOSE TO THE NEW GENERAL POST OFFICE.

MICROSCOPICAL SPECIALITIES,

Vaucheria sessilis, selected fertile filaments stained in
logwood

ILLUSTRATING THE GROWTH, REPRODUCTION, AND STRUCTURE OF PLANTS. Pollen of Cyrtanthera from Brazil............ 1/- per Slide. Pollen grain of Enothera emitting tube..... 1/3 Detached Hairs of Lavender, stained........ 1/3 Selected Spores of Equisetum with expanded elaters...

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1/3

1/3 per Slide. Motile Protococcus pluvialis showing flagella........ 1/3 Puccinia violarum, section of pustule with Uredo and telento-spores...

1/3 1

Specially prepared illustrations of Sachs' and Thome's Textbooks of Botany, being copies of Figures in those works. All Post-free.] CHAS. V. SMITH, CARMARTHEN. [Lists on Application.

SECOND-HAND MICROSCOPES AND OBJECTIVES.

A large assortment by ROSS, BECK, COLLINS, SWIFT, and other first-class Makers, on Sale, very cheap. MICROSCOPIC OBJECTS in great variety. Spécialité Physiological and Pathological Tissues.

500 SECOND-HAND PHOTOGRAPHIC LENSES AND CAMERAS By ROSS, DALLMEYER, TENCH, VOIGTLÄNDER, and all other esteemed Makers. The Cheapest and Best Stock in London. New Catalogues gratis on application. Purchases and Exchanges made. Instruments Repaired and Relacquered.

SANDS & HUNTER, 20, CRANBOURNE STREET, LONDON.

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Very convenient and portable, gives ample Illumination, has all necessary adjustments, is provided with a Cylindrical Case, and can be conveniently carried in the breast coat pocket; when charged with sufficient Oil to burn for above 3 hours, weighs under 12 oz. Price 8s. 6d. Microscopists who are in the habit of exhibiting at the Meetings of their respective Societies and elsewhere, should provide themselves with this little Lamp.

MICRO-PETROLOGY, TYPICAL ROCK SECTIONS, 1/6 AND 2/- EACH. JAMES HOW & Co., 73, FARRINGDON STREET, LONDON.

STUDIES IN MICROSCOPICAL SCIENCE,

Edited by ARTHUR C. COLE, F.R.M.S., &c.

VOL. III. will be commenced shortly. All correspondence connected with this Volume to be addressed to
J. G. HAMMOND & Co., 136 Edmund Street, Birmingham, from whom Prospectus can be obtained.
Now ready, VOL. I., containing 53 Chromo-Lithographed Plates, £1 11s. 6d.; or, accompanied by 52 Prepara-
tions, in Cabinet, £4 14s. 6d.
And VOL. II., containing THE METHODS OF MICROSCOPICAL RESEARCH; SECTION I., ANIMAL HISTOLOGY:
SECTION II., BOTANICAL HISTOLOGY; and POPULAR MICROSCOPICAL STUDIES; with 38 CHROMO-
LITHOGRAPHED PLATES, LI IIs. 6d. ; or, accompanied by 36 Preparations, in Cabinet, £4 4s. od.
NOTE.-The Sections of either Volume may be had separately.

All correspondence having reference to Vols. I. and II. to be addressed to the Editor-
ST. DOMINGO HOUSE, 53, Oxford Gardens, Notting Hill, W.
From whom all Particulars may be obtained.

** A. C. COLE AND SON'S Pathological, Physiological, Botanical, and general Preparations and Diatoms, may be obtained of all the principal Opticians.

HARDWICKE'S SCIENCE-GOSSIP.

xxxix

WATKINS AND DONCASTER, Naturalists and Manufacturers of Entomological Apparatus and Cabinets.

N.B.-For Excellence and Superiority of Cabinets and Apparatus, references are permitted to distinguished Patrons and Colleges, &c.

Plain Ring Nets, Wire or Cane, including stick, 1/8, 2/-, 2/3.

Folding Nets, 3/9 and 4/6.

Umbrella Nets, 7/6 (self-acting).

Pocket Boxes,-/6; corked both sides, -/9, 1/-, and 1/6.
Zinc Relaxing Boxes, -/9, 1/-, 1/6, and 2/-.

Ditto, large size, with strap, 6/-.

Nested Chip Boxes, 4 dozen, -/8.

[oz.

nor dangerous to use), 1/- per

[black).
Entomological Pins, assorted or mixed, 1/- per oz. (white or
Glass Killing Bottles or Tubes ready for use, 1/-, 1/6.
Sugaring Lanterns, 2/6 to 10/-.
Sugaring Tin, with brush, 1/6, 2/-.
Mite Destroyer (not inflammable
Store Boxes, 2/6, 4/-, 5/-, and 6/-.
Ditto, Book Pattern, 8/6, 9/6, and 10/6.
Setting Boards, flat or oval, -in., -/6; 1-in. -/8; 14-in., -/9
2-in., -/10: 2-in. 1/-; 3-in., 1/2; 34-in., 1/4; 4-in., 1/6;
4t-in., 1/8; 5-in., 1/10. Complete set of 14 boards, 10/6.
Setting Houses, 9/6 and 11/6; corked back, 14/6.

Zinc Larva Boxes, 9/-, 1/-.

Breeding Cage, 2/6, 4/-, 5/-, and 7/6.

Taxidermist's Companion, i.e. a pocket leather case, containing
most useful instruments for skinning, 10/6.

Coleopterist's Collecting Bottle, with tube, 1/6, 1/8.
Ditto, Tin Boxes, 1/6.

Ditto, Japanned Pocket Case, fitted with 26 tubes, 5/-.
Botanical Cases, japanned, double tin, 1/6, 4/-, 5/-, 6/-, 9/-.
Botanical Paper, 1/1, 1/4, 1/9, and 2/2 per quire. (Too heavy
for post.)

(Supplied to

Insect Cases, imitation mahogany, 3/6 to 11/-.
Cement for replacing Antennæ, -/6 per bottle.
Forceps for removing Insects, 2/6 per pair.
Collectors all over the world.)
Cabinet Cork, 7 X 34, best quality, 1/3 per dozen sheets.
Pupa Diggers, 1/6, 2/-. Insect Lens, 1/6 to 8/-.
Glass Top Boxes, per dozen, 1/8, 2/-, 2/6.
Egg Drills, -/3.

Metal Blow-pipes, -/7.

Setting Needles, 6d. per box.

All Articles enumerated are kept in stock, and can be sent immediately on receipt of order.

For Sale, a large Assortment of Ova and Pupa of both British and Foreign Butterflies and Moths.

CABINETS.-Special Show Room.

The following are the prices of a few of smaller sizes; for measurements and larger sizes see Catalogue (48 pp.)

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A LARGE STOCK OF INSECTS AND BIRDS' EGGS. Birds, Mammals, &c., Preserved and Mounted by First-class workmen. 36, STRAND, W.C. (FIVE DOORS FROM CHARING CROSS).

MARK TWAIN'S

WORKS.

UNIFORM ILLUSTRATED EDITION.

THE ADVENTURES OF HUCKLEBERRY
FINN. With 174 Illustrations by E. W. KEMBLE. Crown
8vo, cloth extra, 7s. 6d.
THE CHOICE WORKS OF MARK TWAIN.
Revised and Corrected throughout by the Author. With Life,
Portrait, and numerous Illustrations. Crown 8vo, cloth extra,
75. 6d.

234

THE INNOCENTS ABROAD; or, The New
Pilgrim's Progress; being some Account of the Steamship
"Quaker City's" Pleasure Excursions to Europe and the Holy
Land. With Illustrations. Crown 8vo, cloth extra, 7s. 6d.
Also a Cheap Edition, post 8vo, illustrated boards, 25.
ROUGHING IT, and THE INNOCENTS AT
HOME. With 200 Illustrations by F. A. FRASER. Crown
8vo, cloth extra, 75. 6d.
THE GILDED AGE. By MARK TWAIN and
CHARLES DUDLEY WARNER. With 212 Illustrations by T.
COPPIN. Crown 8vo, cloth extra, 75. 6d.

LONDON: CHATTO &

MICRO-SLIDES FOR

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Crown 8vo, cloth extra, 7s. 6d.
Also a Cheap Edition, post 8vo, illustrated boards, 25.
LIFE ON THE MISSISSIPPI,
With 311
Original Illustrations. Crown 8vo, cloth extra, 75. 6d.
AN IDLE EXCURSION, and other Sketches.
Post 8vo, illustrated boards, 25.

THE STOLEN WHITE ELEPHANT. Crown
8vo, cloth extra, 6s.

Also a Cheap Edition, post 8vo, illustrated boards, 25. WINDUS, Piccadilly.

SCIENCE CLASSES.

Mr. PIFFARD'S PATENT COUNTER-SUNK SLIPS now

Two sizes are ready, 3-16 and 5-8, at 6s. per dozen.

on Sale.

Prasiola Crispa, portion of Thallus, beautiful arrangement of Chlorophyl granules, 1s. Teleutospores of Puccinia graminis, 1s. Spores and Elaters of Aneura Pinguis (Jungermanniaceae) 1s. Stained and Isolated Conidia-bearing Hypha, of a Micro-fungus, probably Polyactis cana, 1s. Lecanora Tartarea, vert. sect. of Apothecium, showing Asci, 1s. Atrichum Undulatum, vert. sect., Male Perichætum and Antheridia, 1s. Fasciated Stems of Strawberry, Sweet Pea, Tropaeolum and Thistle, 1s. each.

B.

REMITTANCE WITH ORDER. ENLARGED CATALOGUE READY, POST FREE.

PIFFARD, Hill House, Hemel Hempstead, Herts.
Possessing all the Properties of the finest Arrowroot,

BROWN AND POLSON'S CORN FLOUR

Is a Household Requisite of Constant Utility

FOR THE NURSERY, THE FAMILY TABLE, AND THE SICK ROOM. NOTE.-Unlike many others, this CORN FLOUR bears the Name of its Manufacturers, who offer the guarantee of their long-established reputation for its uniformly Superior Quality.

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