February 3, 1932 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME CVIII 



SEPTEMBER, 1921, to DECEMBER, 1921 



" To the solid ground 

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



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JTonfion 



MACMILLAN AND CO., Limited 



NEW YORK : MACMILLAN COMPANY 



