•' ^ 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCl 



" To the solid ground 

 Of Nature trusts the mind which builds for aye" — WORDSWORTH. 





No. 2747, Vol. 109] 



SATURDAY, JUNE 24, 1922 



[Price One Shilling 



Registered as a Newspaper at the General Post Office.] 



[All Rights Reserved. 



BALANCES & WEIGHTS REYNOLDS & BRANSON, Lm 



SPECTROMETERS 



Particulars and Prices on application to— 



JOHN J. GRIFFIN & SONS, L™ 



Kemble Street, Kingsway, 

 London, W.C.2. 



Apparatus for the Accurate 

 Determination of Carbon 

 Monoxide in Gas Mixtures. 



Descriptive Pamplilet on Application. 



14 COMMERCIAL STREET, LEEDS 



HOLIDAY 

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We have over 40 different Pri»m 

 models, and many second-hand pat- 

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^GRETTI '§' ZaMBRA 



38,HOLBORN VIADUCT E.C.I. 

 LONDON. 



