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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. 819, VOL. 32] 
RHURS DAY aa IUilEN. ©, 1885 
[PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office] 
{All Rights are Reserved 
AMATEUR | 
PHOTOGRAPHERS 
SHOULD ALWAYS USE 
mae MAWSON PLATE. 
The BEST and CHEAPEST in the Market. 
Uniform, Reliable, and exceedingly easy to develop. 
DIAWSON &S& SWAN, 
MOSLEY STREET, NEWCASTLE-ON-TYNE ; 
and 31, FARRINGDON STREET, LONDON. 
R. & J. BECK’S 
Mpa WW MICROSC OPH, 
Pree. St AR 
“504 
PRICES. 4 5s. a. 
Stand, with 1-in. Object- 
glass ... ion ose oon, 24 0) 
Stand, with 1-in. and +-in, 
Object-glasses ... 1 6) (0) 
Stand, with Rack and Pinion, 
coarse adjustment, 2 Eye- 
pieces, and r-in. Object- 
glass ... SU Bm tere 3-3-0 
Stand, with Rack and Pinion, 
coarse adjustment, 2 Eye- 
pieces, and I-in. and 1-in, 
Object-glasses ... 440 
full Descriptive Pamphlet sent on 
Application to 
R. &J. BECK, 68, Cornhill, London, E.C. 
BROWNING’S PLATYSCOPIC LENS. 
Engraved Real Size. 
A NEW ACHROMATIC COMBINATION, 
COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 
PORTABILITY OF A POCKET LENS. 
“Tf you carry a small Platyscopic Pocket Lens (which every observer of 
Nature ought to do).”—Grant ALLEN in Knowledge. 
The Platyscopic Lens is invaluable to botanists, mineralogists, or ento- 
mologists, as it focuses about three times as far from the object as the 
Coddington Lenses. This allows opaque objects to be examined easily. 
The Platyscopic Lens is made of four degrees of power, magnifying 
respectively, ro, 15, 20, and 30 diams. ; the lowest power, having the largest 
field, is the best adapted for general use. 
The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. 
Price of the Platyscopic Lens, mounted in Tortoiseshell, magni- 
fying either 10, 15, 20, or 30 diameters, 18s. 6d, each power. 
Illustrated description sent free. 
JOHN BROWNING, 63, STRAND, LONDON, W.C. 
NEGRETTI AND ZAMBRA, 
SOLE MAKERS OF 
JORDAN’S (PATENT) SUNSHINE RECORDER. 
PRICE £3 3s. 
NEGRETTI 
ZAMSBRA, 
ScrentTiFic INSTRUMENT MAKERS 
TO THE QUEEN, 
HOLBORN VIADUCT. 
Branches :—45, Cornhill; 
122, Regent Street, London. 
Lliustrated Description Post Free. 
ae 
i 
NEGRETTI & ZAMBRA’S 
Large Illustrated Catalogue 
600 Pages, 
1200 Engravings. 
Price 5s. 6:2. 
