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WILLIAM WESLEY
WESLEY AND

AND SON, AMPERE METERS AND VOLT METERS. Scientific booksellers and publisbers, 28 ESSEX STREET, STRAND, LONDON.

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60

42-50 each

51 each

The following recently-published
NATURAL HISTORY AND SCIENTIFIC BOOK CIRCULARS

include a portion of their stock :-
s 97-ICHTHYOLOGY; Reptilia and Amphibia ; General Zoology

Deprod Carpentier including Ancient Works, Biographies, Classification, Darwinism

Bus.gdy Manuals, Periodicals, Transactions of Societies ; Anatomy, Physiology

mud Embryology. Price 1d.
No 98- ORYTTHOLOGY: Local and British Ornithological Faunas;

foreign and Exotic Ornithological Faunas; Cage Birds and Poultry
Omithological Monographs; Periodicals and Systematic Works.
M.ANMÄLIA; including Cetacea, Sirenia, and Pinnipedia.
FAUNAS AND GEOGRAPHY of Great Britain and Ireland,
Continental Europe, Africa, America, Arctic Regions, Asia, Austral-

esis ZOOLOGICAL VOYAGES. Over 1000 Works. Price 4d. W. WESLEY & SON, 28 Essex Street, Strand, London.

F.Gozpontier Sag: Conde By LIONEL S. BEALE, M.B., F.R.S., !

Paris

962850
Professor of Medicine in King's College, London.
HOW TO WORK WITH THE MICROSCOPE.

Plates. Sis. (Harrison and Sons.)
OUK MORALITY AND THE MORAL QUESTION. 2s.6d.
100 FIGURES OF URINARY DEPOSITS. 55.
CRINARY AND RENAL DERANGEMENTS AND CAL.

CULOUS DISORDERS, Diagnosis and Treatment. Now Ready, 55.
SLIGHT AILMENTS. Pp. 275. 55.

NEW PRICES. THE MICROSCOPE IN MEDICINE. 86 Plates. 215.

Ampère Meters. Francs.

Volt Meters. Francs. BIOPLASM : Introduction to Medicine and Physiology. 6s. 6d.

50 PROTOPLASM. (New Edition preparing:)

25

25 ON LIFE AND ON VITAL ACTION. 55.

50
40

50

48 THE MYSTERY OF LIFE. 35. 6d.

ICO
37:50

100

45 LIFE THEORIES AND RELIGIOUS THOUGHT. 5s.6d. THE "MACHINERY” OF LIFE. 25. DISEASE GERMS. (Soiled Copies only.) 8s. 6d. London : J. & A. CHURCHILL.

J. CARPENTIER,

PARIS-20 Rue Delambre-PARIS. EYESIGHT AND SPECTACLES. Homeopathic Review, October 1, 1889 :="Parents and those that

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for the Cure of Nervous COMPLAINTS have received Testimonials from three Address

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The distressing symptoms of NERVOUS EXHAUSTION, loss of PROPER GLASSES PRESCRIBED, 5s.

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which convey the electric current direct to the affected parts, gradually stimulating, and strengthening all the nerves and muscles, speedily

arresting all symptoms of premature waste and decay. H. FRIEDLÄNDER & SOHN, Berlin N.W.6, Carlstrasse ii.

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years, in the course of medical practice, I am in a position to speak of their PHYSICAL SCENCES.

SCENCES. et anders vere Electricity is likely to be serviceable. I am entirely convinced 112 Pages, with 4784 Titles of Books, Papers, &c.

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WOODCUT ILLUSTRATIONS and occasional LITHOGRAPHED and CHROMOA MONTHLY MAGAZINE OF NATURAL HISTORY.

LITHOGRAPHED PLATES.
Third Series. Edited by J. E. Harting, F.L.S., F.Z.S., member of the SIMPKIN, MARSHALL, & CO., Stationers' Hall Court.

British Ornithologists' Union; contains
Original Articles by well-known naturalists in every branch of zoology

THE “HANSA," sales of animals: arrival and departure of migratory birds; occurrence of care birds : distribution and migration of British fresh-water fish; new or Published since 1864 in Hamburg, is the only independent professional paper e marine fish; local aquaria; British reptiles; British land and fresh in Germany dedicated exclusively to Maritime Objects. Essays, Critiques, watez mollusca, with remarks on the haunts and habits

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A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE.

To the solid ground
Of Nature trusts the mind which builds for aye."—WORDSWORTH.

No. 1054, VOL. 41.]

THURSDAY, JANUARY 9, 1890.

[PRICE SIXPENCE.

Registered as a Newspaper at the General Post Office.]

(All Rights are Reserved. THE NEW PATENT WATKIN ANEROID BAROMETER. BROWNING'S PLATYSCOPIC LENS. NOT BLADE

Amongst several unsolicited Testimonials

the two following have been received by the PLT WATCH

maker :

The OBSERVATORY, MELBOURNE,
SIZE

October 1o, 1888.
DEAR SIR, -The Watkin Aneroid
only reached me three weeks ago,

I am very much pleased
with it, and have given it a
pretty severe trial with very
satisfactory results.
(Signed) R. J. ELLERY.
EDINBURGH, May 31,'89.

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PATENT

WATHIN

Engraved Real Size.
Dear Sir,- I have just
returned from a six weeks'

A NEW ACHROMATIC COMBINATION,
J. MICKS,

stay at the Ben Nevis Ob COMBINING THE DEFINITION OF A MICROSCOPE WITH THE ervatory, and while there

PORTABILITY OF A POCKET LENS. rad an opportunity of testing the admirable qualities "If you carry a small Platyscopic Pocket Lens (which every observer o of your new "Watkin Nature ought to do)."-GRANT ALLEN in knowledge. Aneroid. The result has The Platyscopic Lens is invaluable to botanists, mineralogists, or ent. been most satisfactory, the

mologists, as it focuses about three times as far from the object as the extreme error noted being Coddington Lenses. This allows opaque objects

to be examined easily. only about too of an inch. The Platyscopic Lens is made of four degrees of power, magnifying

During my stay at the Ob. respectively to, 15. 20, and 30 diams.; the lowest power, having the largest servatory the Aneroid was fre field, is the best adapted for general use. quently tested by taking it down The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames.

2000 feet and then comparing it Price of the Platyscopic Lens, mounted in Tortoiseshell, magniTeresados obtained speak volumes for the high-class workmanship and great

with the standard on my return. fying either 10, 15, 20, or 30 diameters, 18s. 6d, each power. samay you have attained in the manufacture of this instrument.

Illustrated description sent free. J J. HICKS, 8, 9, & 10 HATTON GARDEN, LONDON JOHN BROWNING, 63 STRAND, LONDON, W.C. "The 'STAR' MICROSCOPE is a modern marvel at its low price, The lenses alone are worth the money."Britisk Medical Journal.

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