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ADAM HILGER, Ltd., 75a Camden Road, London, N.W. AWARDED GOLD MEDAL ST. LOUIS EXHIBITION, 1904.

STATIC

AWARDED MEDALS WHEREVER EXHIBITED, including 9 at the great Paris Exposition of 1900.

determination of torsion rigidity of JAS. J. HICKS.

WIRES.

This Apparatus was originally designed by Dr. EWING for use in the Engineering Laboratory attached to the University of Cambridge. A true Couple is applied to the lower end of the wire examined, the forces composing the Couple being transmitted by Pulleys on Ball Bearings and the Angle of torsion read off by means of a Pointer on a scale divided in Degrees.

PRICE

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MACMILLAN & CO.'S NEW BOOKS.

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THE ORIGIN AND DEVELOPMENT OF THE MORAL IDEAS.

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CHEMISTRY

OF

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PROTEIDS.

By GUSTAV MANN, M.D. (Edin.), B.Sc. (Oxon.), University Demonstrator of Physiology, Oxford.
Based on Professor Otto Cohnheim's "Chemie der Eiweisskörper." 8vo. 155. net.

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PHYSICAL OPTICS. By ROBERT W. WOOD, Professor of Experimenta

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BOTANICAL MICROSCOPIC SLIDES FOR STUDENTS.

Including Four Series, 50 Slides in each. Price £1 1s. per Series; adapted for Board of Education and London University Examinations, Illustrating Mitosis, Leucoplasts, Thyloses, Root, Stem, and Flower Develop. ment, Anomalous Stems, Embryo-sac Structure, Pollen Tubes, Botrydium, (Edogonium, Coleochaete, Chara, Sexual Organs and Cystocarps in the Rhodophycea; Peronospora, Saccharomyces, Claviceps, Puccinia, Antho. ceros, Pilularia, Marsilea. Isoetes. Pilotum, Selaginella, Pinus, &c. Catalogue Post Free.

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Inspection invited of a large stock of Minerals, Rocks, Fossils, and Microscopic Objects. Specimens sent on approval.

Cabinets, Geologists' Hammers, Card Trays, Glass-Capped Boxes, Models of Crystals, and other Apparatus for Geologists, &c. NEW CATALOGUES POST FREE.

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MICROSCOPICAL PETROGRAPHY.

Gentlemen interested in the above study are invited to send to
JAMES R. GREGORY & CO.,
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MARINE BIOLOGICAL ASSOCIATION
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THE LABORATORY, PLYMOUTH.
The following animals can always be supplied, either living
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• The first line being in heavy type is charged for as Two Lines.

Cheques and Money Orders payable to MACMILLAN & CO., Limited
OFFICE: ST. MARTIN'S STREET, LONDON, W.C

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The "INCANDANODE" TUBE

(so called because it works all day with the Anode RED HOT).

This Tube ran from 9 a.m. to 6 p.m. for five days at the Leicester meeting of the B. M. A. last July. The Anode was incandescent the whole time, but the Vacuum was fully maintained. One Tube will last for years. The Vacuum is easily adjustable.

THE BELOT SHIELD FOR X-RAY

WORKERS.

MR. HALL EDWARDS (at the Leicester meeting of the B. M. A. last July) said of this shield: "It is a scientific instrument designed on scientific lines, and overcomes all the objections which exist in the shields previously brought to my notice.'

THE

MEDICAL SUPPLY

ASSOCIATION,

Descriptive

228 GRAY'S INN ROAD, LONDON, W.C.
Circulars (with expert testimony) on application.

FOR

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LABORATORIES,

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For Working Coils and Interrupters,
or any Electrical Apparatus requiring
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Switchboards made for any purpose.
Designs and Estimates given from
Specification for Physical Laboratories
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Instruments mounted on Slate or

Dynamos,

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ST. LOUIS EXHIBITION.

Motors, Rotary Transformers for direct or alternating currents, to suit any voltage or periodicity.

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WATSON'S TELESCOPES

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The "CENTURY," with 3-inch Objective, mounted on Garden
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The "ROYAL CENTURY," with 3-inch Objective, mounted on
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ments by screws and Hook's handles

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The above are fitted with the beautiful Watson-Conrady
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The "POPULAR," with 3-inch Objective, mounted on Garden
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For larger sizes of above and full particulars of

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36 10 0

WATSON'S TELESCOPES

9 10 0

WATSON'S MICROSCOPES.

23 DIFFERENT MODELS to select from, suited for every class of research.

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(188 pages) post free on application.
Send for List No. 6, post free on application.
WATSON'S INSTRUMENTS MAY BE PURCHASED BY PROGRESSIVE PAYMENTS.

W. WATSON & SONS, Opticians to H.M. Government,

(Established 1837)

313 HIGH HOLBORN, LONDON, W.C. BRANCHES-16 FORREST ROAD, EDINBURGH, and 2 EASY ROW, BIRMINGHAM.

HAND

THE CORRESPONDENTS' CAMERA. OR TRIPOD

Originally made for the use of Newspaper Men in South Africa, and since used all over the World.

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J. H. DALLMEYER, Ltd., 25 NEWMAN ST., OXFORD ST., LONDON, W.

MAKERS OF THE CELEBRATED DALLMEYER LENSES.
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No Electrical Connections or Coils therefore no resi

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Price £4 10s. net.

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EVERY REQUISITE FOR CHEMICAL, PHYSICAL, AND BACTERIOLOGICAL WORK SUPPLIED, FROM A TEST TUBE TO THE COMPLETE FURNISHING OF A UNIVERSITY LABORATORY.

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(W.J. GEORGE LTD Sucers

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