5'OS-7^^ 



Nature 



A WEEKLY 



ILLUSTRATED JOURNAL OF SCIENCE 



VOLUME LXXX 



MARCH to JUNE, 1909 



" To I he so/id ground 

 Of Nalure trusts the mind which builds for (HY'." — Wordsworth 



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MACMILLAN AND CO., Limited 

 NEW YORK: THE MACMILLAN COMPANY 



