

• ] 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXXXVII 



JULY to OCTOBER, 1911 



" To the solid ground 

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



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UTonDon 



MACMILLAN AND CO., Limited 



NEW YORK: THE MACMILLAN COMPANY 



