SO, 4: 
A WEEKLY ILLUSTRATED JOURNAL OF. SGIENCE.. 
“To the solid ground 
Of Nature trusts the mind which builds for aye.’’—WoRrDSWORTH. 
; fay % 4 
No. 2299, VOL. 92] 
THURSDAY, NOVEMBER 20, 1913 
' [PRICE SIXPENCE 
Registered as a Newsnaner at the General Post Office.) 
{All Rights Reserved. 
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BUY DIRECT FROM 
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JOHN J. GRIFFIN & Sons, L” 
Kemble St., KINGSWAY, LONDON, W.C. 
e 
On 
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For Studying Liquid Films. 
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Price 25/- in United Suede 1/- 
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: A NEW CHEAP FORM. 
Price 2/G Postage 4d, Extra Bottles of Solution, 6de 
ie a < 
REYNOLDS & BRANSON, Ltd., 
A Chemical and Scientific Instrument Makers to 
His Majesty's Government (Indian, Home, and Colonial), 
Laboratory Furnishers and Manufacturing Chemists. 
The Stroud & Rendell Science Lantern was jointly invented by Dr. W- 
Stroud (late Professor of Physics, Leeds University) and W. J. Rendell, 
Esq., and was first catalogued by us in 1893 (vide Chemical and Physical 
Apparatus Catalogue, gth edition, 1893). A large number of these lanterns. 
have been manufactured and supplied by us to numerous institutions both 
at home and abroad. To protect the interests of customers, our ttade 
mark, ‘A Snow Crystal,” is attached to each instrument as shown. 
Catalogue of Optical Lanterns and Accessory 
Apparatus (new edition) post free. 
14 COMMERCIAL STREET, LEEDS. 
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Price £1 1 0 
Description, and Price List of 
Thermometers, &c., 
sent free. 
NEGRETTI & ZAMBRA, 
38 Holborn Viaduct, London, E.C. 
City Branch: 45 Cornhill, E.C. 
West End: 122 Regent St., W. 
