Pe ERK TeetisiRaArED JOURNAL OF SCIENCE: 
“© To the solid ground 
Of Nature trusts the mind which builds for aye.” —WORDSWORTH. 
No. 1550, VOL. 60] 
THURSDAY, JULY 13, 1899. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
{All Rights are Reserved. 
EWTON & CO.’S GARDEN SUN-DIALS. 
= 
= 
SUN-DIALS. 
ON APPLICATION, 
From 4 in., 20s., to 18 in., £8 10s. 
BRASS CIRCULAR HORIZONTAL 
FULL AND DESCRIPTIVE PRICE LIS‘ 
—< 
<I So 
NEWTON & CO. 
{OPTICIANS TO THE QUEEN & GOVERNMENT, 
_3 FLEET STREET, LONDON. 
BEC X’S 
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. BECK, Ltd., 
68 CORNHILL, LONDON, E.C. 
| Coddington Lenses. 
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. 
“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 
This allows opaque objects to be examined easily. 
The Platyscopic Lens is made of four degrees of power, magnifying 
respectively 10, 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, 0% 30 diameters, each power, 15s, 
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 DEFINITION & HiGH Power. 
TELESCOPE. 
As supplied by NEGRETT!I & ZAMBRA to the War Office. 
Length, when closed, 11 inches. Combining high power and portability. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEFN 
38 HOLBORN VIADUCT, E.C. 
Branches: 45 CORNHILL; 122 REGENT STREET. 
