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Self-recording Barometers,

Self-recording Thermometers,

Self-recording Hygrometers,

Self-recording Galvanometers,

Self-recording Rain-gauges,

&c.,

Should see that they are marked

TRADE

RE

MARK.

This mark has been entered by the Inventors and Manufacturer No articles without this Mark are genuine.

TO SCIENCE LECTURERS.

See Mr. HUGHES'S PATENT COMBINATION OPTICAL LANTERN, used by late W. LANT CARPENTER, Esq., Prof. FORBES. New Triple constructed for B. J. MALDEN, Esq., this season. New Oxyhydrogen Microscope. Grand Results Docwra Triple, Prize Medal, Highest Award. Supplied to the Royal Polytechnic Institution, Dr. H. GRATTAN GUINNESS, Madame ADELINA PATTI, &c. Patent Pamphagos Lantern Science Lecture Sets Novelties Cheapest and Best. Elaborately Illustrated Catalogue 300 pages, 15.; Postage, 5d. Smaller do., 6d. Pamphlets Free.-HUGHES, SPECIALIST, Brewster House, Mortimer Road, Kingsland, N.

NO BELLADONNA NEEDED.

FOURNET'S REFRACTOMETER. OCULIST'S APPARATUS (PATENT),

SILVER MEDAL, PARIS, 1889.

See "ENGINEERING," July 18, 1890. Shown before the Royal Institution.

ON SALE BY

MACMILLAN & BOWES,

CAMBRIDGE.

COMPTES RENDUS HEBDOMADAIRES DES SÉANCES DE L'ACADÉMIE DES SCIENCES. Vols. 4 to 23, 26 to 33, 42, 43, 45 to 87, 90, 91. 28 Vols. Half Calf, the rest in Numbers. (4 Tables, 2 Titles, and 7 Numbers wanting.) In all 75 Vols. 1837 to 1880. 10 10s.

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COSMOS, Revue encyclopédique hebdomadaire des progrès des Sciences et de leurs applications aux Arts et l'Industrie. Fondée par B. R. de Monfort, redigée par l'Abbé Moigno. (First Series), 1859 to 1863, to Vols (Second Series), Les Mondes. 1863 to 1881, 56 Vols. Third Series. Vols. 1 to 3. In all 69 Vols. 8vo, Half Calf. 1859 to 1882. L10 105.

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A Monthly Journal of Edu- CURATIVE

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Sets of this important Journal are very scarce. It contains valuable mathematical questions and solutions, the republication of which, in book form, did not commence until 1864 Pages 25 to 48 of Vol. 4, and the Title and Contents of Vol. 40 are want ng: otherwise it is perfect.

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THE ENTOMOLOGIST'S MONTHI MAGAZINE.

Price Sixpence, Monthly. Edited by C. G. BARRETT, G. C. CHAMPION, F.ZS. J. W. [e W. W. FOWLER, M.A., F L.S., R. McLACH AN, F.R S., E S F.L.S., and LORD WALSINGHAM, M A., LL D., F.R.S. This Magazine, commenced in 1864, contains standard articles an on all subjects connected with Entomology, and especially on the the British Isles.

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STANLEY

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MICHAEL FARADAY.

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DMITRI IVANOWITSH MENDELEEFF.
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OFFICE OF "NATURE," 29 BEDFORD STREET, STRAND.

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CADBURY'S COCOA

"A light, refreshing, and digestible beverage,absolutely pure Cocoa of the highest quality." Medical Annual, 1890.

NO

"The typical Cocoa of English manufac absolutely pure."-The Analyst.

CHEMICALS USED

(As in the so-called pure Foreign Cocoas).

Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Pather MACMILLAN AND Co., at 29 Bedford Street, London, W.C., and 112 Fourth Avenue, New York.-THURSDAY, January 12, 1

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to £7

MADE

HSIZE.

Amongst many unsolicited Testimonials the following has been received by the maker:

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[All Rights are Reserved.

BROWNING'S

New 3-Wick Lantern.

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EDINBURGH, May 31, 1889. DEAR SIR,-I have just returned from a six weeks' stay at the Ben Nevis Observatory, and while there had an opportunity of testing the admirable qualities of your new "Watkin" Aneroid. The result has been most satisfactory, the extreme error noted being only about ro of an inch. During my stay at the Ob. servatory the Aneroid was frequently tested by taking it down 2000 feet and then comparing it with the stan dard on my return. The results obtained speak volumes for the high-class workmanship and great accuracy you have attained in the manufacture of this instrument.

R. C. MOSSMAN,
F.R.M.S., Observer,
Scott. Met. Soc.

Japanned Tin Body; 4-inch Compound Condensers; Double Achromatic Front Lenses, with Rack Adjustment; and powerful Three-wick Lamp, in Strong Wood Case, complete, price £1 12s. 6d.

o be obtained of all Opticians and Wholesale Houses. HICKS, 8, 9, & 10 HATTON GARDEN, LONDON.

Or with Four-wick Lamp, £1 16s. 6d. This is an admirable Lantern for making Photographic Enlargements.

Illustrated Catalogue of Lanterns, 352 pp., Post free.

JOHN BROWNING,

Optical & Physical Instrument Maker,
63 STRAND, LONDON, W.C.
NEGRETTI AND ZAMBRA'S
NEW YEAR'S PRESENTS.
OPERA, RACE, & FIELD GLASSES

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OF EVERY DESCRIPTION.

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J. BECK 68, CORNHILL, LONDON, E.C.

Barometers, Microscopes, Telescopes,
Magic Lanterns, &c., &c.

Illustrated Price Lists posted free to all parts of the World.

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N. & Z.'s Large Illustrated Catalogue, 1200 Engravings. Price 5s. 6.7
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