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Nature, 1 

 March 30, 1916. 



Nature 



A WEEKLV 



[ ILLUSTRATED JOURNAL OF SCIENCE 



All 



VOLUME XCVI 



SEPTEMBER, 1915, to FEBRUARY, 1916 



^-/^ 



"71? the solid ground 

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



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MACMILLAN AND CO., Limited 

 NEW YORK: THE MACMILLAN COMPANY 



