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WATKINS & DONCASTER,

Naturalists and Manufacturers of CABINETS AND APPARATUS

FOR COLLECTORS OF INSECTS, BIRDS EGGS AND SKINS
MINERALS PLANTS, &c.

BIRD NESTING BOXES of various patterns; they should be fixed in gardens, &c., by lovers of birds before the breeding season.

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 (New and Second-hand) on Insects, Birds' Eggs &c., supplied.

86 STRAND, LONDON, W.C.

FULL CATALOGUE POST FREE.

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MICROSCOPIC SECTIONS OF ROCKS & MINERALS, 48 Sydney Street, Fulham Road, South Kensington, London, S.W.

EITHER FROM STOCK OR CLIENTS' OWN MATERIALS.

Descriptions and Reports made at an inclusive charge if desired. Apply

JAMES R. GREGORY & CO.,
Mineralogists, &c.,

139 FULHAM ROAD, SOUTH KENSINGTON, S.W. 'Phone: Western 2841. Telegrams: Meteorites, London."

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 15. 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, Alcyonium; 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, Salpa (preserved), Scyllium, Raia, &c., &c.

For prices and more detailed lists apply to
Biological Laboratory, Plymouth.

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THE DIRECTOR.

SKELETONS & SKULLS Specimens and Preparations for Teaching BIOLOGY & ZOOLOGY

and for Museums.

Lists on Application. EDWARD GERRARD & SONS Osteologists and Taxidermists, NATURAL HISTORY STUDIOS 61 College Place, Camden Town, London.

Collections in Polished Deal Boxes.

MINERALS, ROCKS, FOSSILS.

25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/-. 20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Inspection invited of a large stock of Minerals, Rocks, Fossils, and Microscopic Objects. Specimens sent on approval. Prospectors' Sets, Blowpipe Cases, Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes, Models of Crystals, and all Apparatus for Mineralogists and Geologists. ROCK SECTIONS to Order at 1/6 each.

NEW CATALOGUES POST FREE. RUSSELL & SHAW, 38 Ct. James Street, Bedford Row, London, W.C.

NOTICE.-Advertisements and business letters for "Nature" should be addressed to the Publishers; Editorial Communications to the Editor. The telegraphic address of "Nature" is "Phusis," London.

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Telephone-Gerrard, 8830.

S. d.

10 6 15 6

8 0

(A charge of 6d. is made for changing Scotch and Irish Cheques.)

410

Cloth Cases for binding "Nature" are issued at 1s. 6d each, and can be sent post free for 1s. 9d.

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Cheques and Money Orders should be Crossed and made payable to MACMILLAN & CO., Limited.

OFFICE: ST. MARTIN'S STREET, LONDON, W.C.

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Telephone: 1674 Gerrard.

Model A, for use between 60° N. and 60° S.
Model B, for use in any Latitude

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£3,110 £4 10

With descriptive pamphlet.

Illustrated Catalogue, Part 4, Post Free.

J. H. STEWARD, Ltd.

Opticians & Scientific Instrument Makers to the British & Foreign Goct 406 & 457 STRAND, LONDON ESTABLISHED 1852.

YOUR OPINION of an English-made Microscope should be formed by the use of

WATSON'S MICROSCOPE

They are not merely good-they are the best-in design, perfection of movement, and accuracy
detail. They give a lifetime of working efficiency.

THE BACTIL MICROSCOPE, as illustrated, is an excellent high-class Instrument, with ne
Side Lever Fine Adjustment, handle arm, and extra large Stage with very long range of movement
PRICE, with 2/3, 1/6, and 1/12 inch Oil Immersion Objectives, 2 Eye pieces, Abbe Illuminate
Triple Nosepiece, complete in Mahogany Case,
£23: 26

Newly published Catalogue, giving particulars of the above and 40 other models, post free on request
W. WATSON & SONS, Ltd., 313 High Holborn, London, W.

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Established 1837.

(16 Forrest Rd., Edinburgh.
196 Great Portland St., London, W.

Works-HIGH BARNET, HERTS.

2 Easy Row, Birmingham.

Depots 212 Notre Dame St. West, Montreal, Canad 78 Swanston St., Melbourne, Australia.

HE Spencer Lens Company are the only American manufacturers of Apochromatic objectives, side fine adjustments and many other of the higher refinements of microscope construction. This in part accounts for their preference by the largest American Universities, Colleges, and careful laboratory workers generally.

The many advantageous features of

SPENCER MICROSCOPES

will interest you.

1914 Price List with specific information sent on request.
SOLE AGENTS for Great Britain and Ireland (except London)-

STANDLEY BELCHER & MASON, Ltd., Church Street, BIRMINGHAM

Printed in Great Britain by R. CLAY & SONS, LIMITED, at Brunswick Street, Stamford Street, S.E., and published by MACMILLAN AND CO., LIMITED at St. Martin's Street, London, W.C., and THE MACMILLAN Co., 66 Fifth Avenue, New York.-THURSDAY, March 4, 1915.

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