Nature, 

 August 12, 1922J 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME CIX 



JANUARY, 1922, to JUNE, 1922 



" To the solid ground 

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



1£onbon 



MACMILLAN AND CO., Limited 



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