A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
“ To the solid ground 
Of Nature trusts the mind which builds for aye.” —WORDSWORTH. 
No. 1564, VOL. 60] 
THURSDAY, OCTOBER 19, 1899. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.) 
{All Rights are Reserved. 
et OF 
EW LANTERN SLIDES. 
SEASON 1899-1900. 
The Transvaal and the War. 
St. Paul’s Cathedral 
The Thames. 
Flower Studies. 
Australia—up Country. 
Meteorology. 
Lang's Fairy Tales. 
Alice through the Looking-glass. 
Stations of the Cross from Wood 
Vireless Telegraphy. 
,stronomical- Works in the Solar 
Physics Observatory. 
dlements of Agriculture—Cattle and 
Wheat. , . 
3irds and Animals, by R. B. LopceE. 
jpiders, Insects, and Butterflies. 
-anterbury—the City and Cathedral 
Shina—Burma. a 
Malay Archipelago. Carvings 3 
National and Tate Gallery. Chinese Illustrations of Bible 
3elgium. Stories. 
&c., &c. 
Knowledge Series, Astronomy. 
Full detailed List of Lanterns and Slides on 
application, Six Stamps. 
NEWTON & CO., 
BEC kX’ 
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 
No. 55. 
R. & J. BECK, Ltd., 
68 CORNHILL. LONDON. E.C, 
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).”—GraNnT ALLEN in Knowledge. 
The Platyscopic Lens is invaluable to botanists, mineralogists, or entc- 
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 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 Piatyscopic Lens, mounted in Tortoiseshell, magnifying either 
10, 15, 20. or 30 diameters, each power, 15S. 
In nickelised German Silver, each power, 17s. 6d. 
Illustrated Description sent free. 
JOHN BROWNING, 63 STRAND, LONDON, W.C 
> SPECTACLES 
ELECTRIC LIGHT, INCANDESCENT GAS, 
And other 
Powerful Illuminants. 
NEGRETTI & ZAMBRA’S 
THERMOSCOPIC LENSES 
Protect the Eyes from Glare, and 
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Illustrated Price Lists of Optical and Meteorological Instruments 
Free by Post to all parts of, the World. 
| NEGRETTI AND ZAMBRA, 
| SCIENTIFIC INSTRUMENT MAKERS to THE QUEEN, 
38 HOLBORN VIADUCT, E.C. \ 
| BRANCHES: 45 CORNHILL; 122 REGENT STREET. 
{ 
