
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
‘* To the solid ground 
Of Nature trusts the mind which builds for aye.” — -WORDSWORTH, 





No. 2777, VoL. 111] 
SATURDAY, JANUARY 20, 1923 
[PRICE ONE SHILLING _ 


Registered as a Newspaper at the General Post Office.) 

BALANCES & WEICHTS 
FE. BEC’ KER & C® 
& J.GEORGE (LONDON) Lt’? PROPRIETORS 
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Particulars and Prices on application to— 
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Kemble Street, Kingsway, 
London, W.C.2. 



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