A WEEK 



ILLUSTRATED |OURNAL OF SCIENCE. 



" To the solid ground 

 t)t Nature trusts the mind which builds for aye." — Wordsworth. 



No. 2558, VOL. 102I THURSDAY. NOVEMBER 7, 1918 



ri «( the 1 tenerai Post c iffic 



I Price Ninepence. 



[All Kichts Reserved. 



OPTICAL LANTERNS 



Educational. Welfare. Scientific, and other 

 WORK of NATIONAL IMPORTANCE 



NEWTON &, CO., 



Makers of Optical Projection Apparatus of every description 

 (Established ovbb i , I 

 72 WIGMORE STREET, LONDON, W. 1. 



DUROGLASS L™ 



14 CROSS STREET, HATTON GARDEN, E.C. 



Manufacturers of 



Borosiiicate Resistance Glassware. 



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Soft Soda Tubing for Lamp Work. 



General Chemical, and 



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Special Glass jlpparalus Made to Order. 



DUROGLASS WORKS, WALTHAMSTOW. 



AGENTS : 



BAIRD & TATLOCK (LONDON) LTD. 

 14 CROSS ST., HATTON GARDEN, E.C. 1. 



We 



specialise 

 in the manu 

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application to \. "%. 



THE SILICA SYNDICATE, Ltd., \4^ 



28 VICTORIA STREET, n5^p 

 WESTMINSTER, S.W.I V<cP 



Telephone : Holborn 63 



Xote Xnv Addre 



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NEGRETTI & ZAMBRA, 

 38 HOLBORN VIADUCT, E.C. 1 



5 LEADEN.HALL ST. LONDON. 

 5«~ Our City Branch h at 



132 REGEINT ST. 

 W. 1 



nhcll Street. E.C. 3 



