PVE EK LY IeeUSiwaAtT ED JOURNAI OB SCLlIENCE: 
“To the solid ground 
Of Nature trusts the mind which builds for ave.”—WoORDSWORTH. 
NO. 1552, VOL. 60] 
THURSDAY, JULY 2771800: 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
{All Rights are Reserved. 
SUN-DIALS ON PEDESTALS. 
BRASS CIRCULAR 
HORIZONTAL 
SUN-DIAL, 
Complete on 
TERRA-COTTA 
PEDESTAL. 
12-in. diameter, £6 10s. 
Sun-Dials of every Description 
Price Lists on Application. 
NEWTON & CO., 
Opticians to the Queen 
and Government, 
3 FLEET STREET, 
LONDON. 
BEC E&,’ 
NEW 
MICROSCOPE 
THE 
“BRITISH STUDENTS.” 
Microscope Stand No. 55, as 
figured, with Iris Diaphragm, 
One Eye-piece; Double Nose- 
piece, Two Object-glasses, 2/3” 
and 1/6”, adjusted to be in 
about focus, and the whole 
packed in polished Mahogany 
Case, 
£6:8:6 
R. & J. BECH, Ltd., 
68 CORNHILL, LONDON, E.C. 
No: 55- 
BROWNING’S PLATYSCOPIC LENS. 
With Larger Angles, Increased Field, and Improved Definition 
Engraved Real Size. 
AN ACHROMATIC COMBINATION, 
COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 
PORTABILITY OF A POCKET LENS. 
““If 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, magnifying either 
10, 15, 20, 07 30 diameters, each power, Ss. 
In nickelised German Silver, each power, 17s. 6d. 
Illustrated Description sent free. 
JOHN BROWNING, 63 STRAND, LONDON, W.C 
NEGRETTI & ZAMBRA’S 
BINOCULARS AND TELESCOPES. 
Makers of the ‘OFFICER OF THE WATCH” TELESCOPE, 
in use on all the vessels of H.M. Navy. 
Nickel-plated, covered with Brown 
Leather. 
PRICE ... .- £2 10s. 
Perrect Derinition & HiGH Power. 
As supplied by NEGRETTI & ZAMBRA to the War Office. 
Length, when closed, 11 inches. Combining’ high power and portability. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN 
38 HOLBORN VIADUCT, E.C. 
Branches: 45 CORNHILL; 122 REGENT STREET. 
